Mille Catalogue 2007 English

11_MILLE2_HI-ENERGY3_ENERGY4_DIECI5_ACCESSORIES6_ELECTRONICSS_SPACE

www.hertzaudiovideo.comwww.hertzaudiovideo.com

The Sound Experience

The absolute novelty in the world of high fidelity reproduction.In 1999 HERTZ introduced MILLE speakers in the market. This revolutionaryseries was designed in order to get extraordinary performance and meet theneeds of the most demanding enthusiasts with state-of-the-art components.These speakers set new standards in sound reproduction, they wereappreciated by the public and obtained valuable awards by the most importantjuries, like ECAP prize for HSK 1600, elected the best loudspeakers systemin the year 2001-2002. HERTZ has now managed to improve what seemed to be already perfect. MILLE line will be able, once again, to set higher quality standards of musicalreproduction in cars, having enthusiasts love the utmost quality of thesespeakers all over the world. Car Stereo will experience the most thrillingsolutions, the most concrete answers, the new references in technology andsound. Passion urges HERTZ to look for extreme products, whose fundamentalfeature is perfection, without compromises.Living and working in the service of sound.

index

comp..............................................2

system ..........................................14

sub comp ....................................22

practical recommendations........................26

find your box................................28

technologies ................................30

TETOLON® DOME TWEETERREN® NEODYMIUM MAGNETALUMINIUM CASE WITH CHAMBERS

TETOLON® DOME TWEETERREN® NEODYMIUM MAGNETALUMINIUM CASE WITH CHAMBERS

4

MILLE COMP

180 Watt4 ohm28 mm91 dB/SPL

1. Tetolon® Fiber dome with hemispheric-hyperbolic profilefor excellent dynamics and off-axis response.

2. Acoustic damping material for very detailed, accurate highfrequency response.

3. CCAW double layer voice coil, wound on kapton former,for maximum power handling.

4. Double REN® neodymium magnet for utmost controland acceleration.

5. Rear vents for smooth, natural sound.6. Rear acoustic chambers for low Fs and flatter,

wider response.7. Non-woven, natural damping material for better damping

and accuracy.8. CCN-turned case, derived from solid aluminium,

for a mechanically inert, acoustically transparent structure.

The load in the tweeter dome rear part affects its performancesince the membrane can see a free space in the front, while thereis a back load due to the very small volume between central poleand dome. ML 280 has eight vents which ensure a resonance-freematching with the rear damping chambers. The volumes and vents sizes, as well as the special absorbingmaterial, provide mobile voice coil with optimal damping,generating natural, clear, dynamic sound.

When designing the magnet of a tweeter, it is importantto concentrate energy on mobile voice coil. The mechanicalexcursion of this component is very limited, but accelerationsspeed is very high. For mobile voice coil very good control,you need to have high magnetic induction in the gap and to usefirst-grade ferromagnetic materials. ML 280 tweeter employs highthermal threshold, REN® neodymium double magnet and very lowcarbon percentage iron, especially designed for it.

Air flows under the dome.

5

Electro-Acousticparameters

Technicalspecifications

Component Size Power Impedance Frequency Sensitivity Outer Mounting Magnet Total Mounting Weight VoiceHandling response diam. hole size depth depth of one coil

diameter comp. diam.mm (inch) Watt ohm Hz dB/Spl mm mm mm mm mm kg mm

Tweeter 28 (1”1/8) 180W@1,8kHz 4 950 - 25k 91 52 47 38 35 23 0,094 2812dB/Oct.

Tweeter 28 (1”1/8) 180W@2,0kHz 4 1,3 - 25k 91 52 47 38 27 16 0,091 2812dB/Oct.

D Xmax Re Fs Le Le Vas Mms Cms BL Qts Qes Qms Spl

mm mm ohm Hz mH@1kHz mH@10kHz lit gr mm/N T-m dB

28 - 3,0 930 0,78 0,04 - - - - 0,40 0,90 0,72 91

28 - 3,0 1100 0,98 0,05 - - - - 1,21 1,96 3,14 91

big chamber

small chamber

big chamber

small chamber

Frequency response with big chamber Frequency response with small chamber

ML 280 dome has an exclusive profile, designed by HERTZ:its first section is hemispheric, the top is hyperbolic.The relation of emitting diameter, membrane height and surroundprofile ensures very low Fs without affecting dynamics at mid-highfrequencies. The fiber is Tetolon®, a mixture of cotton and silkin controlled percentage that, together with the natural resinimpregnating treatment, makes the component go beyond theaudible range, like all stiff dome drivers but without the troublesomeresonances which characterise this technology.

The original building features and the advanced technology applied to ML 280 make it unique. The colorless reproduction of mid-high frequencies and trebles requires sure, doubtless performance.ML 280 naturally carries out this hard task, counting on an unlimited power reserve. It is agile when disentanglingitself among the smallest details and resolute when giving the most powerful musical entries. This component iscolorless in any conditions, in favour of music, be it classical or modern, be it made of voices or of live instruments,or of performance recorded in studios. When it is used with reference woofers in two-way systems, it candecrease cut-off frequency down to very low ranges, where crossover point is regular and spontaneous.ML 280 is the best tweeter in terms of efficiency, linearity, frequency response and musicality also in three-waysystems, thanks to the state-of-the-art midrange and to very rich mid-bass.

RIBBON MID-TWEETERMYLAR SILVER LAYERREN® NEODYMIUM MAGNETALUMINIUM CASE

RIBBON MID-TWEETERMYLAR SILVER LAYERREN® NEODYMIUM MAGNETALUMINIUM CASE

8

180 Watt8 ohm117 x 15 mm93 dB/SPLMILLE COMP

1. Acoustically transparent aluminium grille.2. Die-cast aluminium face plate designed for the best

off-axis response.3. Ultra-light Mylar layer with silver deposit, for extraordinary

flat response at ultrasonic frequencies.4. Push-pull REN® magnet with 12 Neodymium bars for natural,

thrilling performance.5. Rubber sealing gaskets for vibrations rejection.6. Dipolar emission for ideal damping.

The membrane is the only part of a speaker which must play.That is why utmost attention was paid to the elimination of anyresonance which might spoil acoustic performance. ML 500R face plate is made of first quality die-cast aluminiumalloy. It’s completely inert and allows the membrane to changethe smallest, most delicate sound tones into acoustic energy.ML 500R unique feature is acoustic radiation dipolar typology. Dueto the absence of a back load, the membrane can workin maximum symmetry and with ideal damping.

ML 500R is one of the very few isodynamic ribbon speakers with push-pullmotor section and membrane/magnet innovative geometry. The motorstructure was designed to generate a perfectly symmetrical magnetic field,in order to eliminate intermodulation distortions and concentrate very highenergy in the gap.What you get is a component with 6 dB higher efficiency than a traditionalspeaker, with excellent dynamics and very high dissipation factor.

9





Ribbon 117 x 15 180W@900Hz 8 700 - 35k 93 168x88 156x65 - 19 10 0,640 -Mid-Tweeter 12dB/Oct.



- - 7,5 370 - - - - - - - - - 93

Frequency response

If you want to obtain the same pressureyou get with ML 500R (93 dB 1W/1m) froma traditional speaker (87 dB 1W/1m),you need to use a four-time higher power.ML 500R bass response is outstanding:Fs is only 370 Hz and this is an impressivevalue for such a compact component.It makes its versatility and easy use unique.

Most enthusiasts and professionals believe that ribbon speakers can ensure faster transients than traditional conedrivers, thanks to their very light mobile voice coil. According to these parameters, mid frequency range is a verydifficult load, in terms of importance and of amount of information. ML 500R can easily carry out this task. Its frequency response can go from 700 Hz to 35 kHz: it is the flattest,widest response which a midrange can have. ML 500R is quick, dynamic, efficient; its power handling is veryclose to the one of a subwoofer. Its warm, natural sound can generate pure listening emotions. Imaging is real,sound levels location is definite, tridimensionality is very easily conveyed.When it is used in two-way systems, it has to be perfectly aligned with the listening point. Its responseis excellent in this configuration; however, this speaker performs at best in three-way systems, whereit is naturally integrated with woofer and tweeter, providing no-compromise, state-of-the-art systems.

V-CONE® WOOFERREN® NEODYMIUM MAGNETALUMINIUM BASKET

V-CONE® WOOFERREN® NEODYMIUM MAGNETALUMINIUM BASKET

12

250 Watt4 ohm165 mm93 dB/SPLMILLE COMP

1. Anti-resonant aluminium alloy basket for accurate, colorless sound.2. Acoustically transparent basket design.3. Cotton-injected paper cone for stiffness, lightness and dynamics.4. Exponential V-Cone®, for utmost linearity and dispersion.5. S-DWR®, butyl rubber, sinusoidal double wave surround for better efficiency and excursion linearity.6. Nomex® spider assembled on an anti-compression raised support, for full-bodied, natural sound.7. Lead wires plastic support with silicone; it can stand hard mechanical stress.8. CCAW double layer voice coil, wound on Kapton® former, for maximum power handling.9. Very big, REN® neodymium magnet for bursting dynamics.10. Copper-covered pole for flat impedance and smooth frequency response.11. Vented poles for maximum aerodynamic performance at the longest excursions.12. Lowered bottom plate for better excursion and efficiency.13. Rubber covered magnet for resonance elimination.

More than 35 materials, different in terms of paper fibers composition and impregnating materials, were realised, analysed and evaluated for ML 1600 cone construction. The selected mixture has good stiffness,damping and lightness. No other rigid fiber, composite material sandwichor obtained from metal mould can provide such natural, accurate,dynamic sound. ML 1600 “V” CONE® has a totally new, HERTZ proprietary exponentialgeometry. Its contact point with mobile voice coil uses a very light papersupport, which optimises mechanical coupling and insures very highefficiency. This new geometry provides very flat off-axis response, up toso-far unbelievable frequencies for a component with this diameter, no break-up phenomena and optimal damping, for rich, accurate sound in the whole bandwidth.

The design and development of MILLE components magnets employedadvanced finished elements modelling (FEM) technologies. ML 1600motor core is a new sized REN® neodymium ring, especially moulded for this component. This material uses an innovative rare earths mixturewhich provides a huge amount of energy and total thermal stability.Top and bottom plates employ high saturation level ferromagnetic material and are machined through a high precision process. The magnetic flux reaches a value which was inconceivable a few yearsago, providing excellent energy dissipation, very high efficiency andbursting dynamics.

Every element of a speaker contributes to sound reproduction. The mechanical resonances of a traditional basket, usually between 800and 1300 Hz (according to mass and stiffness), absorb precious energywhich should be transferred only to the membrane. A completely inertbasket was designed for ML 1600, thanks to the development of a self-standing structure and to the use of a light, damped aluminium alloy. This basket has new, unique acoustic transparency; sound is accurate,without coloration and resonances.

13

The elaboration of an advanced set of dynamic measurements pointed out a determinant factor: mobile voice coil inductance modulation,derived from the winding interaction with central pole and gap. When thecomponent excursion gets bigger than the voice coil height, there is aninterference which heavily affects FFT, causing strong intermodulation. ML 1600 magnet geometry, together with central pole complete shieldingthrough a pure copper plate, provides exceptionally constant parameterseven with high power in the input and at long excursions. You can listen to totally controlled, accurate musical signal even with very high soundpressure and to firm dynamics in whatever conditions.

VOICE COIL +10mm VOICE COIL -10mmVOICE COIL CENTERED





Woofer 165 (6”1/2) 250 4 40 - 7k 93 167 144 80 80 76 1,222 36



128 6 3,1 71 0,67 0,11 6,82 17,1 0,29 7,23 0,41 0,44 5,46 93

Frequency response

ML 1600 woofer has extraordinary features: deep, controlled bass; powerful, fast mid-bass; linear, natural midranges;balanced, rich mid-high frequencies. It can meet any power demands in the best way. The special basket, its magnet, the mobile voice coil and the exclusive V-Cone® make ML 1600 unique and ideal to any solution. Transients reproduction isaccurate and without distortions, generating strong sensations when the music requires it. ML 1600 can also astonish withclear, detailed images, with extraordinary dynamics which conveys also the smallest tones. Tonally colorless, this woofer is not affected by resonances or by notches; its response is smooth and efficient up to morethan 7 kHz, allowing daring crossover points without fear of troublesome losses. Thanks to its versatility, ML 1600 works best in two-way systems, as easily as it can perform “the” mid-bass in multi-way systems. Its easy driving and control inwhatever conditions let it be at the top of its category. In the service of sound.

ML 1600

2 AND 3 WAY SYSTEMSHFC® HIGH FREQUENCY CONTOURTAD® TIME ALIGNMENT DEVICEHIGH FREQUENCY ADJUSTMENT

2 AND 3 WAY SYSTEMSHFC® HIGH FREQUENCY CONTOURTAD® TIME ALIGNMENT DEVICEHIGH FREQUENCY ADJUSTMENT

16

TW LEVEL

-4,5 dB

-3 dB

-1,5 dB

0 dB

MILLE SYSTEM

2 way system300 Watt4 ohm165 mm93 dB/SPL

big chamber small chamber grille

By setting the jumper called Wiring Mode on BI, it will be possibleto connect two amplifiers to the crossover and, thus, to drivewoofer and tweeter separately. The power increase you getin this configuration enhances MLK 2 system features, with allthe pros of multiamplification.

MLCX 2 crossover permits to adjust the tweeter level alonga very wide dynamic range, down to 4.5 dB attenuation.It is therefore very easy to find and set the flattest frequencyresponse in whatever conditions, according to the type of installation,to the music you are listening to and to personal tastes.

17


Size Power Impedance Frequency Sensitivity Outer Mounting Total Mounting Weight Crossover Component SoundHandling Watt response diam. hole depth depth of one included adjustment control

diameter comp.mm (inch) Peak Continuous Ohm Hz dB/Spl mm mm mm mm kg

165 (6”1/2) 300 150 4 40 - 25k 93 167 144 80 76 1,222 2,8kHz Tweeter TAD®

- 12/12 dB Oct. 0; -1,5; HFC®

28 (1”1/8) -3; -4,5 dB

woofermidrangetweeter

TAD Bypass TAD Bypass

HFC

ON OFF

TAD/HFC on

TAD/HFC off

+ 25 ÷ 30 cm

MILLE speakers have full, flat response and don’t needany equalisations; their location in the car compartment,however, may involve unpredictable variables. Car is oneof the most complex, difficult surroundings for musicalreproduction and demands the solution to various problems:the relation between direct and reflected sound, the mutualposition of the speakers in the system. In standard installations,the Left and Right channels will be at different distances andangulations with regard to the listening point. This location willalter the width and the phase of the perceived signal.MLK is the first to introduce a time delay control system, builtin a passive crossover: TAD® Time Alignment Device. By settingthe proper jumpers in the crossover, the channel response isimproved with regard to extension, sensitivity and phase, withthe same FFT for the two channels. The perceived sound imagegets in the center of the virtual stage; tonal accuracy getscolorless, clearer.

If you focus on the components technical features, you risk to lose touch with the most beautiful element of Millesystems: sound. A state-of-the-art installation, even if simply made in factory locations but with utmost attentionto fixing and vibrations rejection, will enhance musicality. The system main characteristic is clearly perceptible:superior tonal accuracy. Sound recreates the instruments tridimensionality and makes the listener feel as if he tookpart in the musical event. Colorless sound, controlled, full, solid bass impact, very good dynamic reserve whichperforms at best when the musical track involves you the most, for blur-free reproduction. ML 280 off-axisresponse is perfectly even, as well as its off-axis response; this ensures detailed, clear, definite sound image.Thanks to the filter efficient action, sound stage gets higher and centered, making voices natural and firm, singlingevery element out in the orchestra, easily recreating real, complete, detailed sound. MLK 2 installation in the car compartment is eased by the woofer standard size (thanks to its neodymium magnet,it is shorter) and by the tweeter with aluminium structure and differentiated acoustic chambers. Extraordinaryversatility is ensured by the passive filter and by its adjustments. Tuning is spontaneous in any car, since you canhandle the listening position you prefer, the response equalisation, the components efficiency. Simply by movingthe jumpers for the various controls, you can achieve the smoothest response in whatever conditions,for extraordinary excitement.

18

MILLE SYSTEM


ON OFF

HFC

MLCX TAD® Circuit

Time Alignment Device® for every way and High FrequencyContour® for implementing the system in different installationtypologies, in the doors, in the dashboard or in the rear deck:the most complete series of controls for car compartmentinstallation optimisation which a passive filter is provided with.The new reference for this category: Quadralitz coils, polyestercapacitors, metaloxide resistors on TR® heat sink, aluminiumcase with transparent cover. This crossover means versatility,both when it is showed in the system like a work of artand when it cannot be seen at all.

big and small chamber grille

19




165 (6”1/2) 350 175 4 40 - 25k 93 167 144 80 76 1,222 900Hz - 12/12 Tw- Mid TAD®

117 x 15 4,55kHz - 6/12 0; -1,5; HFC®

28 (1”1/8) dB Oct. -3; -4,5 dB


ML 500R Frequency response

ML 500R dispersion has a wider off-axis response diagramalong the horizontal axis. In order to best enjoy the extraordinaryacoustic features of this component, we suggest you install it as in the picture if your car allows it, with the horizontal emission axis oriented towards the listening point.

Like the two-way system, also MLK 3 canbe used in multi-amplification. By settingthe jumpers in the right way, you can getendless typologies of systems which employMLCX 3 filter. The use of an amplifier for everyspeaker or of a multi-channel amplifierdedicated to the three-way system enhancesacoustic results, since you can tune the levelsindependently through gain controls, you canhandle the power reserve of every componentand improve general performance, until youreach absolute perfection.

When having everything is not enough, the choice of a three way system gets obvious, necessary. MLK 3 is nota simple evolution of a two-way system, rather a complete system created to satisfy the most demanding users.The woofer is quick and clean whenever power is needed; it ensures accurate, full, solid mid-basses conveying,thus, the instruments stresses. The use of a ribbon midrange, ML 500R, and of ML 280 tweeter allows the systemtransparency and naturalness when reproducing male and female voices: their details and tones get lively in thesound stage center. The piano, which is extremely accurate thanks to its linearity, sounds sweet, even, natural,and the filter leads the components the way a conductor gives parts and scores to his best players.Installing a three way system involves very important considerations when designing it; yet, all effortsare rewarded by MLK 3 superb acoustic performance.

20

MILLE SYSTEM


big and small chamber grille

ML 28 tweeter was designed to combine space, light weight andperformance in every system with no compromise. The domedouble profile, hemispherical and hyperbolical, allows to regularizethe component dispersion and get a flat frequency response evenin the most critical installations. The fiber used is a mixture ofcotton and silk in a controlled percentage with a double water-proof processing; combined with a double neodymium and ironmagnet with a very low percentage of carbon, it performs a verylow resonance and generates a very high range, featuring amazingenergy, detail and impressiveness. The mechanical excursion ofthis component is limited, but the acceleration capability is burning.In the ML 28 motor there are eight ports that connect the tweeterdome to the rear acoustic chambers, creating the ideal dampingload to eliminate the resonances and extend the sound withcompetition dynamics.

ML 28 - TweeterML 165 - WooferMLCX 20 - Crossover

Air flows under the dome.

21

The wish to achieve the best sound performance is not the only issue to consider when making an audio system.Those who buy a speakers system often make their choice through their eyes, heart and passion and theyprobably do not want to make any compromise. MLK 165 is a two-way kit designed for those who likecustomizing everything in their car, even the sound: aggressive in every respect, innovative for its technology,powerful in performance, but above all with an extremely winning look. Thanks to the bi-amplificationconnections, to increase the driving power, and the HFC, to optimize the acoustic response in every installation,all the speakers capacities can be performed naturally. Do not take anything for granted, from the lowest notesthe system shows a great personality and a full-bodied sound that can be expected from much biggerspeakers. The bass dynamic impact, control and depth are supported by a remarkable linearity, with its typicalsolid and firm timber features. The listening feeling is consistent and real. The energy flowing from the speakersrecreates extraordinary sensations of speed and power.

BI-WIRING

MONOBI

TW LEVEL

-4,5 dB

-3 dB

0 dB

-1,5 dB

ON OFF

ML 165 woofer features the same technical solutions as ML1600 with a different goal. The cone fiber made from celluloseand impregnating materials, the V-CONE profile and the self-standing anti-resonant aluminium alloy basket are basic essentialelements for a reference speaker. No other mechanical systemcan be so stiff, damping and light. The new magnet, with a newpowerful oversize ferrite motor has the suitable characteristics toensure a remarkable thermal stability and a bursting dynamics.ML 165 is the specific component for those who long for thebest performance in terms of impact, speed and dynamics in thelow and mid-low range.

Vehicles interiors are very complex environments for musicreproduction, and differ in every car model. With the MILLE linewe have aimed at achieving enthralling performance, designingtechnologically advanced speakers and inserting unique andinnovative crossovers in terms of manufacturing andperformance. MLCX 20, supplied with the system, can allow bi-amplification, to assign one amplifier to every speaker, and the adjustment of the tweeter output level, with 4 softening levelsof 1,5 dB steps, and the tuning circuit of HFC high frequencies.These controls will make it easier and intuitive to get the suitablefrequency response according to the installation, the music youare listening to and your personal tastes.




165 (6”1/2) 300 150 4 35 - 25k 92 167 144 80 76 1,697 2,5kHz Tweeter HFC®

- 12/12 dB Oct. 0; -1,5; -3;28 (1”1/8) -4,5 dB


V-CONE® SUBWOOFERANTI-RESONANT ALLOY BASKETTRIPLE VENTING SYSTEMSYMMETRICAL SHAPE POLEFRONT-BACK GASKET

V-CONE® SUBWOOFERANTI-RESONANT ALLOY BASKETTRIPLE VENTING SYSTEMSYMMETRICAL SHAPE POLEFRONT-BACK GASKET

24

Subwoofer1500 Watt4 ohm300 mm89 dB/SPL

THE SOUNDEXPERIENCE

MILLE SUB COMP


Powerful from the lowest octaves of the audio range. The ML subs set a new benchmark for lowfrequency reproduction with the impact, dynamics and pressure that only a reference componentcan achieve. Power and harmony in the anti-resonant aluminium alloy basket design, self-standinglow incidence five-spokes structure, Front-Back Gasket, magnet protection. Ultimate technology in every detail: V-CONE with Polypropylene membrane stiffened with mineral dusts, high excursionsurrounds, extended pole piece, dual layer mobile voice coil with copper covered aluminium wire(CCAW), oversize motor assembly with an exclusive forced ventilation circuit. A harder, deeper and more controlled bass for a unique enthralling experience.

25



Size Power Impedance Frequency Sensitivity Outer Mounting Magnet Total Mounting Total Weight Voice X-mechHandling Watt response diam. hole size depth depth driver of one coil

diameter displace. comp. diam.mm (inch) Peak Continuous ohm Hz db/Spl mm mm mm mm mm lit kg mm mm

250 (10”) 1200 600 4 31 - 1000 87 268 234 190 195 166,5 2,1 12,3 65 28

300 (12”) 1500 750 4 25 - 900 89 318 284 190 207 179 3,1 12,8 65 28

380 (15”) 1800 900 4 22 - 800 91 391 351 190 218 190,5 3,9 13,7 65 28



210 19 2,6 33 1,71 0,85 19,00 165,0 0,14 13,00 0,50 0,52 11,00 87

253 19 2,6 32 1,67 0,83 39,00 197,0 0,12 14,00 0,51 0,53 10,40 89

320 19 2,6 28 1,68 0,84 130,00 233,0 0,13 13,00 0,60 0,44 11,65 91

ML 2500

ML 3000

ML 3800

ML 2500

ML 3000

ML 3800

ML Subs look no more like working tools and become reference speakers. The subwoofer has the doublefunction of completing the ultralow range and arousing real listening sensations. It plays the main role in thetotal involvement of music reproduction. The new ML were designed to be used in controlled and smallvolumes and making a box means to let them perform at 100%.Connected to amplifications of suitable power they immediately show their strong determined personality. Able to fill with vital energy the lower part of the sound faultlessly with an overwhelming “punch”, ML subssucceed in rendering the original instruments dimensions, stressing the hardest transients and disentangling the most difficult passages.Complete and enthralling, they perform seemingly unlimited dynamics, completed by an exemplary tonalquality, reproducing correctly every different music genre. Thrilling design and performance, impressive look and power: these subwoofers can turn into bursting sound all the energy output by the amplifier for top soundperformance.


26

19 mmMIN

1 2

Damping materials

3 4

75° 90°

5

Tdd = Total driver displacement

Vcc

Tdd+

Vb Vcc

Vcc

++Vcc

Tdd

Vb

Tdd

6

Vtrp = Volume tablet reflex port

Vb1+

Vtrp

Vb2+

Vtrp

7

30 mmMIN

8

L

L-25/30%9 10

PRACTICAL RECOMMENDATIONS

ConstructionWhen building a subwoofer box, you’d better care for somedetails:

1_ Use a thick material as stiff and dense as possible;like MDF or high density multilayer wood.

2_ Glue and seal all the box walls using good qualityvinyl glue. Use more glue to seal all internal joints.

3_ Use damping material like AZ Audiocomp FONOMATon the internal walls.

4_ Always use the gasket between the basket and themounting surface, and use a criss-cross pattern tofirmly secure the fixing screws.

5_ Use at least one slanted wall in order to make theenclosure fit the car compartment, solve size problemsand decrease the box internal vibrations.

6_ Consider the speaker overall dimensions whencalculating volumes since it is not included in theindicated volumes. If you place the magnet speakerinside the box, add Total driver displacement to thevolume of the box itself.

7_ In the case of a Reflex (vented), Asymmetric Bandpassor Double Reflex design, do not add the volumedisplacement of tuning port to the total volume.Only add the volume displacement of the actual materialthe port is made from; for example: the volume displacedby the wooden board in case of a lamellar (slot type)tuning port.

8_ Leave at least 30 mm between the subwoofer backplate and the back wall of the enclosure.

9_ If you place the tuning port next to a corner of theenclosure, shorten it by 25-30% compared to thesimulation. This is because of the virtual extension ofthe port being close to the side walls. Do the same ifthe port design is lamellar (slot type).Whenever possible, we recommend you measure thetuning frequency with a suitable method.

10_ After finishing your reflex box, please test it into yourcar compartment by changing the port length and, thus,frequency, or the quantity of sound-proof materialinto it. This is the only way you can be sure you getthe acoustic results you want. By shortening the portor decreasing the quantity of sound-proof material,you increase frequency and get clearer, crisper bass;vice versa, bass will be deeper but less sharp.

27

etc...

etc...Sub 1 Sub 2 = Sub 1 Sub 3 = Sub 2

Vcc 1 Vcc 2 = Vcc 1 Vcc 3 = Vcc 2

11

12 13

Low Pass CrossoverFrequency Range

30

9040

80

100110

B

ALERT:Distortion

A

Subsonic Filter

15 50

15 50ON

C

Loudness

0 Hz20 200 2K

Flat

D

E F

11_ When using two or more speakers in your design, it isextremely important to use identical models, installedin the same type of enclosure.

12_ Power cables are very important because theydirectly affect the system damping factor. In theenclosed table, we show cable diameters, which werecommend according to length and applied power.The table refers to continuous power into 4 ohm load.When load decreases, the cable size will have toproportionally increase.

13_ Make sure the entire enclosure assemble is solidlyand safely mounted to the vehicle’s chassis.

Tuning

After you finish installing the enclosure in your vehicle,it is recommended to spend some time to tune the systemand its amplifiers. Remember that a small power amplifierdriven into full distortion can damage a speaker. On thecontrary, a very powerful amplifier with a linear operationrarely causes system failures:

A_ Adjust the amplifier gain control to make use of allthe amplifiers undistorted power.

B_ Set the cut-off frequency between 45 and 120 Hzaccording to the type of configuration used.

C_ If available, use the subsonic filter, setting the cut-offfrequency around 25 Hz.

D_ Avoid to use loudness or equalisers at low frequencies(<150 Hz): MILLE ML subwoofers have full, smoothresponse and don’t need any corrections, that mightcause the amplifier saturation or distortion.

E_ The subwoofer connection phase determines acousticresults and needs to be tested by being listened to.It might be necessary to invert it according to theconfiguration of main speakers and of other electronicdevices in the system. Make some listening tests inboth ways and choose the solution you prefer.

F_ You can adjust bass also by changing the subwooferposition inside the trunk. It is very difficult to know inadvance the results you will get in your car compartmentand you’d better make some tests by moving thesubwoofer box and the port and speaker emittingdirection.

28

FIND YOUR BOX

The ML Subwoofers electro-acoustic parameters are optimized for use in an enclosure. In this manual we have provided the specifications for two different sealedand reflex (vented) enclosure configurations for each model, which vary in size and performance. For each type you will find projects that favor size,for minimum possible bulk, or for absolute performance, to the detriment of the space taken up.ALL OF THESE PROJECTS HAVE BEEN DESIGNED, TESTED AND OPTIMIZED IN THE LABORATORY AND THEN PERFECTED IN THE ACTUAL VEHICLE INTERIOR.THE REPORTED CURVES ARE NOT SOFTWARE SIMULATIONS; THEY ARE ACTUAL DATA OBTAINED BY SOUND MEASUREMENTS DEVICES IN THE VEHICLE.ML subwoofers can be used in many other enclosure configurations other than the ones listed in this manual. With the help of a computer simulation software, you may design anenclosure that is better suited for the acoustics of your vehicle and your desired performance. There are some practical suggestions to follow when designing an enclosure.Please remember that:_ In the designs included in this manual, the box volume includes the displacement volume of the speaker itself considering it is mounted with the

frame/magnet structure inside the box;_ If you invert the subwoofer, with the frame/magnet assembly on the outside of the enclosure, you should subtract the speaker displacement volume

(Total driver displacement) from the suggested enclosure volume;_ The suggested designs, both sealed and reflex (vented), have been optimized considering the use of a sheet damping material like the AZ Audiocomp FONOFORM

on all the internal walls of the enclosure, other than the speaker’s baffle._ The tuning ports specified in the reflex (vented) designs are meant for mounting near one of the box corners and their material displacement volume is already

included in the overall box volume;_ If you wish to design an enclosure with several subwoofers, use only the same subwoofer model using the same enclosure configuration. Each subwoofer should

have its own separate enclosure within the single structure.

Warning: those who wish to find more information on building these enclosures can visit the following address: www.hertzaudiovideo.com,where technical files are available in PDF format containing all the tables with precise measurements.

Sealed Box

Reflex Box

ML 3800

ML 2500 Extension

Punch

SPL

Extension

Punch

SPL

Extension

Punch

SPL

ML 3000

Find your Box Sealed BoxDimension

Reflex BoxDimension

Sealed BoxPerformance

Reflex BoxPerformance

234

250210

250

234

270250

270234

280

L: 240

220

280

42

4277,5

284

310210

310

284

350240

350

234

280290

280

42

4277,5

L: 250

284

330230

330

42

4277,6

L: 210

284

350310

350

72

72

90

L: 220

351

360200

360

351

380300

380

351

380300

380

67

67

90

L: 220

351

400400

400

82

82105

L: 250

Per

form

ance

SEALED BOX / CASSA CHIUSA REFLEX BOX / CASSA ACCORDATA

ML 2500 ML 3000 ML 3800 ML 2500 ML 3000 ML 3800

Dim

ensi

on

Sealed BoxDimension: This design is deliberately small in order to optimize the availablespace; this is the perfect solution for those who have a small space but do notwant to give up a powerful bass.Performance: Bigger, both in dimensions and sound, it responds with a full bodilybass with excellent extension and dynamics.

Bass Reflex Dimension: Almost the same dimensions as the Sealed Box Performance, yetoffering a wider extension, with a stronger sound and an excellent articulation.Performance: Great power handling, high sensitivity values and great impact; this is the perfect design for powerful bass with every kind of music.

29

MILLE COMP

180 Watt4 ohm28 mm91 dB/SPL

ML 280 Signature Frequency Response Test

Parameters selection and quality control are very important to HERTZ production. Every component is subjectedto several controls along the whole production line and it is then selected according to strict criteria andvery small tolerances.

To satisfy the needs of the most demanding enthusiasts, HERTZ worked out a very precise, selective matchingprocess for ML 280 tweeters. ML 280 Signature components are chosen at the end of the production processthrough an analysis which evaluates their performance in the domain of time and frequency. The data are recordedin a special database which analyses their performance and couples the pieces according to their serial number.

The result is a packaging which contains a pair of identical tweeters, able to ensure state-of-the-art performancein state-of-the-art systems.

30

ML 280 / ML 28 TECHNOLOGIES

1

2

5

3

4

6 7

1_ Tetolon® Fiber dome with hemispheric-hyperbolicprofile. The 28 mm diameter, the dome heightand the special profile ensure maximumstiffness and the right linearity for flat, smoothfrequency response even beyond the audiblerange.

2_ The motor assembly special shape createsperfect field symmetry which provides startlingenergy. Thanks to the use of a double REN®

Neodymium magnet, ML 280 can maintainmobile voice coil movement linearity even atextreme excursions, ensuring extraordinaryenergy for state-of-the-art performance.

3_ The upper pole, covered by a pure copper shortcircuit ring, generates an anti-inductive effect,flattening impedance. CCAW copper coveredaluminium wire voice coil makes this mobilevoice coil very light, yet stiff. These elementsact together, providing the best SPL valuesand the best response at very high frequencies.

4_ Cooling and decompression radial ducts.Designed in order to enhance heat dissipationand to avoid compression under the dome,they optimise mobile voice coil damping andresonance. The holes special geometry and therear resonance chamber provide natural, linearsound by eliminating all noise.

5_ Non-woven natural damping material.The one used under the dome differs fromthe one employed for resonance chambers;damping is increased, as well as the tweeterdynamics.

6_ The main housing and the rear chambers areobtained from solid aluminium. The precisionworking ensures a totally inert structure whichimproves the component performance andchanges the smallest, most delicate soundtones into acoustic energy.

7_ Acoustic chambers with different loading.The tweeter can be used in differentconfigurations, since it is possible to choosethe best Q for the system by changing the rearacoustic chamber. The chambers simulatesealed box configuration; they are filled withnatural, non-woven absorbing material for thecomponent best damping. The small chamberincreases Q factor and makes the tweeterslope sharper; the big one makes slopesmoother at lower frequencies.

31

8

10 9

11 12

ML 500R TECHNOLOGIES

8_ Die-cast aluminium alloy face plate. Stiffness,damping and lightness, reflections analysisand sound accuracy for a component whichsurpasses any other references.

9_ Atypic REN® Neodymium magnet madeof 12 magnetic bars in push-pull configuration.It is designed in order to generate a perfectlysymmetric magnetic field which eliminatesintermodulation distortions, ensuring a four-timehigher efficiency than a traditional speaker andextraordinary dynamics.

10_ Ultra-light Mylar membrane, 117 x 15 mm,with silver deposit. The special treatment withvaluable metal gives Mylar the right stiffness;thanks to it, to the material lightness and tothe magnet special structure, frequencyresponse can go from 70 to 35000 Hz.

11_ Dipolar emission. Acoustic radiation is notaffected by a back load; this way the membraneworks in maximum symmetry, with idealdamping, ensuring the most natural, colorlessmusical reproduction.

12_ Acoustically transparent aluminium grille.Designed as an integral part of ML 500R,it both mechanically protects the speakerand contributes to acoustic results, for thedriver best performance.

32

14

15 16

18

19 20

ML 1600 / ML 165 TECHNOLOGIES

13

17

13_ Paper cone with cotton fibers molded withwater-repellent impregnating materials.The exponential profile without dust covergets very close to the ideal one, providingexceptional dispersion. The use of a papersupport optimises mechanical coupling,eliminating break-up phenomena and ensuringthe smoothest high frequency response.

14_ Rubber, latex and silicone double-wavesurround, with sinusoidal profile. This evolutionof the innovative DWR®, with integrated gasket,can stand extreme linear excursions, settinga new standard in musical reproduction.

15_ Anti-resonant aluminium alloy basket.The special low incidence basket arms providemembrane with minimum back radiationresistance and eliminate distortion.The self-standing structure helps in mechanicaldamping without affecting acoustics.

16_ Nomex® spider with integrated lead wires.Valuable materials and technology appliedto sound change a hidden part into a necessaryelement to ensure vibrations rejection andmechanical control in the reproductionof musical signals, even at the longestexcursions.

17_ The motor is built around a high thermalthreshold REN® Neodymium ring, with uniquesizes. Located into a structure which enhancesflux symmetry in the gap, it achievesextraordinary values and ensures thermalstability, bursting dynamics, very highefficiency. The butyl rubber protection whichcovers the magnet damps resonance andvibrations, improving the basket work andcompleting the component aesthetical design.

18_ The pure copper cover central pole and the two layer, CCAW, 36 mm voice coil, wound on Kapton® former, flatten impedance, ensuremaximum power handling and the smoothestmid-high frequency response: the woofer canplay at higher frequencies without problems.

19_ The ferrite magnet assembly was designedusing state-of-the-art development softwaresand generates a very high field power. Itsconsiderable size does not hinder the mountingbut is the main feature to grant a very highthermal stability and bursting dynamics.

20_ Acoustically transparent grille. Grilles are builtto offer the best mechanic protection, yet beingcompletely transparent and not hindering thewoofer mid-frequency reproduction.

TAD/HFC on

TAD/HFC off

23

24 25

21 22

TW LEVEL

-4,5 dB

-3 dB

-1,5 dB

0 dB

26 27

MLCX TECHNOLOGIES

33

21_ Aluminium die-cast central case. Utmost careand attention are paid to every detail: the filtercase, with hidden fixing system, is made ofinert material, to reject all vibrations.

22_ Aluminium heat sink for resistors.Metaloxide resistors are connected in paralleland assembled on a special heat sink whichehnances their performance and powerhandling. This configuration increasesthe resistors working temperature stabilisation,notably improving acoustic results.

23_ TAD® + HFC®: time alignment and listeningpoint optimisation system. The car compartmenthas fixed listening positions and the componentsforced installation sometimes places themat different distance and non favourableangulations. Thanks to these adjustments,both the driver and the passenger will be ableto fully enjoy the components best acousticresponse, simply by setting the rightadjustment on the filter.

24_ Filters are pre-set in order to allowmulti-amplification connections.The possibility to set an endless numberof configurations makes these crossoversextremely flexible and universal.

25_ Inductors: 1mm Quadralitz copper coils,low resistance, high saturation flux;Capacitors: polyester film, 100 Vdc, very low DF;Layout: 1.7 mm shockproof FR2with very thick pads.

26_ Filters have tweeter and midrange sensitivitycontrol. The 1.5 dB-step attenuators permitto tune the speaker at best, in every carand according to every need.

27_ Nothing is haphazard: reinforced ABS case and aggressive design with hidden fixingsystem for staggering installations. Power andcontrol: low resistance as high saturation fluxvoice coils, 100 Vdc polyester film capacitors,tweeter sensitivity control. Amplification can be doubled. High Frequency Contour.

34

28 29

31

30

3332

ML SUB TECHNOLOGIES

28_ The V-CONE is applied to a Polypropylenemembrane stiffened with mineral dusts. The exponential profile without dust covergets very close to the ideal one andeliminates break-ups to provide the maximum undistorted performance.

29_ Power transfer is carried out through screwterminals that accept peeled cables up to 5 AWG. The terminal blocks are inside themounting surface and are arranged to allowthe linear connection of the cable. Mounting on elastic support preserves the mechanicalintegrity, protecting the nerve center of thecomponent from the vibrations that the sub can generate.

30_ Reference in design: power and harmony in amix of sharp lines and widely curved profiles.The anti-resonant aluminium alloy basketfeatures five low incidence spokes and offersthe minimum back radiation resistance,eliminating every distortion due to acousticcompression. The self-standing geometry of the structure contributes to total mechanicaldamping, performing a perfectly transparentsound.

31_ Foam surround and Conex® spider with highthermal and mechanical linearity. Like competition cars suspensions, theseelements must stand the most extremeconditions: ensuring the utmost stability andsymmetry at the highest excursions forastonishing impact and amazing extension to the low range.

32_ The “Symmetrical Shape” central poleaddresses the external lines increasing themagnetic flux density and perceptiblydecreasing the field asymmetry distortion.An aluminium rounded ring inside the motorcuts the inductance modulation at the highestexcursions, for a harder, deeper, clearer bass.

33_ Basic design and care for details. The gasket is designed to allow both possible mountings. In the traditional position a rubber gasketensures a perfect hermetical seal and theinserts, imitating the spokes lines, protect and cover the subwoofer fixing screws. Whenthe sub is used with the magnet visible, thegasket can be mounted upside down in orderto finish off the basket nicely.

35

34

35

ML SUB TECHNOLOGIES

34_ Aluminium die-cast protective grille. The gaskethousings and the inserts covering the basketedge are pre-set to accommodate theprotection grille base which becomes anintegral part of the speaker without increasingthe subwoofer external size.

35_ The dual layer mobile voice coil with coppercovered aluminium wire (CCAW), the subwooferthrobbing heart, is wound round a carbon fibersupport, stiff and light to ensure very highmechanical Qs, transferring the energy to thecone with amazing efficiency. The support isset on the cone bottom through a self-referringsystem, for a mechanically perfect mounting.

36_ The spider support contributes to totalmechanical performance. Made to improve thedispersion of the heat generated by the coiland to reduce the compression below thespider, it favors the thermal exchange with theoutside increasing the power performance.

37_ Extremely big double high flow density magnet.Only the exclusive double magnetization cycle,optimized in times and tensions, allows togenerate a force factor which can control themobile equipment with the right energy, for anexcellent transient response.

38_ The combination of flared port with radial holesin the central pole in the bottom plate carriesthe air compressed by the cone movementdirectly to the mobile voice coil and outside the magnet assembly, producing a 30% fall of the speaker operation temperature. The improvement of the air flows inside themotor, with this peculiar channel geometry,creates a forced ventilation circuit thatdrastically reduces the dynamic compression,raising the applicable power over the top.

39_ High current lead wire integrated in the spider.The conductors which transfer the current tothe voice coil are not subject to mechanicalstress; so they generate electrical andmechanical safety, and furthermore grant asilent operation even at the highest excursions.

40_ Like in motorbikes chassis, the anti-resonantaluminium carter covering the magnet closesthe basket in a unique configuration,performing aesthetical and mechanicalfunctions. The stiffer structure contributes toeliminate the resonances induced in thesubwoofer bearing system.

36

37 38

39 40

36

Technical Specifications

Component

Sizemm (inch)

Power HandlingWatt

Impedanceohm

Frequency responseHz

SensitivitydB/SPL

Voice coil diametermm

Magnet

Cone / Dome

Crossover included

Component Adjustment

Sound Control

peak

continuousprogram


ML 280big chamber

ML 280small chamber

ML 500R ML 1600 MLK 3MLK 2 MLK 165

ML 280big chamber

ML 280small chamber

ML 28small chamber

ML 28 ML 500R ML 1600 ML 165big chamber

Size

Outer diametermm

Mounting hole diametermm

Total depthmm

Mounting depthmm

Weight of one componentkg

A

B

C

D

E

F

52

47

-

-

35

23

0,094

52

47

-

-

27

14

0,091

44

38,5

-

-

36

17

0,085

44

38,5

-

-

26

9

0,079

168

156

88

65

19

10

0,640

168

144

-

-

80

76

1,222

168

144

-

-

80

76

1,700

ML 2500 ML 3000 ML 3800Size

Outer diametermm

Mounting hole diametermm

Total depthmm

Mounting depthmm

Weight of one componentkg

A

B

C

D

E

F

268

234

-

-

195

166,5

12,3

318

284

-

-

207

179

12,8

391

351

-

-

218

190,5

13,7

Tweeter-

--

28 (1”1/8)

[email protected]

12dB Oct.

4

950 - 25k

91

28

NeodymiumREN®

Tetolon Fiber®

----

----

-

Tweeter-

--

28 (1”1/8)

[email protected]

12dB Oct.

4

1300 - 25k

91

28

NeodymiumREN®

Tetolon Fiber®

----

----

-

Ribbon Mid-Tw-

-117 x 15

-

180W@900kHz

12dB Oct.

8

700 - 35k

93

-

NeodymiumREN®

MylarSilver Layer

----

----

-

Woofer-

165 (6”1/2)--

250

125

4

40 - 7k

93

36

NeodymiumREN®

Water repellentpressed paper

----

----

-

2 way system

165 (6”1/2)-

28 (1”1/8)

300

150

4

40 - 25k

93

-

--

--

2,8kHz12/12 dB Oct.

--

Tweeter:0; -1,5; -3; -4,5 dB

--

TAD® - HFC®

3 way system

165 (6”1/2)117x1528 (1”1/8)

350

175

4

40 - 25k

93

-

--

--

900Hz12/12 dB Oct.

4,5kHz6/12dB Oct.

Tweeter:0; -1,5; -3; -4,5 dB

Midrange:0; -1,5; -3; -4,5 dB

TAD® - HFC®

2 way system

165 (6”1/2)-

28 (1”1/8)

300

150

4

35 - 25k

92

-

--

--

2,5kHz12/12 dB Oct.

--

Tweeter:0; -1,5; -3; -4,5 dB

--

HFC®

MLCX 2 MLCX 3 MLCX 20

244

150

-

-

45

-

-

359

150

-

-

45

-

-

183

124

-

-

46

-

-

37

9013

1061

.06.

0

ML 2500 ML 3000 ML 3800

Subwoofer

250 (10”)--

1200

600

4

31 - 1000

87

65

Double magnet highdensity flux ferrite

Polypropylenewith mineral powder

----

----

-

Subwoofer

300 (12”)--

1500

750

4

25 - 900

89

65



----

----

-

Subwoofer

380 (15”)--

1800

900

4

22 - 800

91

65



----

----

-

PART OF ELETTROMEDIA - 62018 Potenza Picena (MC) Italy - Tel. +39 0733 870 870 - Fax +39 0733 870 880 - www.elettromedia.it

HERTZ Awards

Mille Catalogue 2007 English

Documents

tweeter dome rear

small chamber tweeter

natural sound

sound reproduction

big chamber tweeter

mobile voice coil

big chamber frequency

natural damping material