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TITLE: 3 C U B I C F H e r ; S A P T ^ C - E S C A R C J S F O R .
R o u e H I C H F t o e u n Y UXJC> S P E A K E R S V & T S M S
SHEET OF UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES ANO MILLIMETERS
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N o r t h r i d g e , C a l i f o r n i a 9 1 3 2 9
TITLE: s c u b i c F e e T 7 e u c L o s o t e j s f g ^
H C M G HKS.H F I O e t - I T y L O U D S P E A K E R ^ S Y S T E M S
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J B L Enclosure Porting Chart H o m e E n t e r t a i n m e n t L o u d s p e a k e r s
o; PfllSC (see nae 6)
or PfllSC (600 note 6)
Noles 1. This chart contains porting recom
mendations tor J B L lull range, extended rangeandtowlrequency loudspeakers in a variety of enclosure volumes. Each represents the optimum tor the mean of the volume range indicated, i.e.. the dimensions given tor an enclosure volume of 85 titers (3.1-4.0 cubic feet) actually would be optimum for an enclosure volume of 99 liters (3.5 cubic feet). The port dimensions for the enclosure drawings in the J B L Enclosure Construction Kit have been optimized for those specific enclosure volumes and configurations and. therefore, may not agree with the information in this chart.
2. Enclosure volume can be calculated by multiplying internal length x width x depth If the measurements are taken in inches, divide by 1728 (the number of cubic inches in a cubic foot) to obtain internal volume in cubic feet.
3. Duct length is measured, from the baffle surface to the end of the duct, and thus includes the thickness of the baffle panel.
4. Port area may be converted to d'ameter using the formula A = tt ra
The diameters given in the table below are inside dimensions. The baffle panel should be cut to accommodate the outside diameter of the lube used.
5. Multiple pods may be used, but the total area (not diameter) must equal the area specified. Divide the area by the number of pons to be used, then calculate diameter. Even though multiple ports are used, duct length for each should be as specified in the chart.
6. Refer to the literature enclosed with passive radiators for tuning instructions.
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J B L Enclosure Porting Chart M u s i c a l I n s t r u m e n t L o u d s p e a k e r s
W i r e C h a r t H o m e H i g h Fidelity L o u d s p e a k e r S y s t e m s
d i s t a n c e i m p e d a n c e
4 Q 16S?
0 - 1 5 m ( 0 - 5 0 f t ) 1 6 A W G 1 8 A W G 2 0 A W G
1 5 - 3 0 m ( 5 0 - 1 0 0 f t ) 1 4 A W G 1 6 A W G 1 8 A W G
3 0 - 6 0 m ( 1 0 0 - 2 0 0 tt) 1 2 A W G 1 4 A W G 1 6 A W G
M u s i c a l I n s t rument L o u d s p e a k e r S y s t e m s
d i s t a n c e i m p e d a n c e
4 f i 8 n 16S1
0 - 1 5 m ( 0 - 5 0 ft) 1 4 A W G 1 6 A W G 1 8 A W G
1 5 - 3 0 m ( 5 0 - 1 0 0 ft) 1 2 A W G 1 4 A W G 1 6 A W G
3 0 - 6 0 m ( 1 0 0 - 2 0 0 ft) 1 0 A W G 1 2 A W G 1 4 A W G
J B L Port Tuning Work Sheet
Recommended Tuning Frequency For JBL Loudspeakers
Model Description Enclosure
Tuning Frequency
124A 136A
300-mm (12 in] low frequency 380-mm (15 in) low frequency 26 Hz
1 F8T LE10A LE12C LE14A LE I4C LFI5A
200 mm (9 in) full range 250-mm ( 1 0 in] low frequency 300-mm ( t2 in) composite 360-mm (14 in) low Irequency 360-mm (14 in) cornposiie 3fi0 mm ( 1 5 in) low Irequency
32 Hz
D123 D131 D130
130 A. 130L1
300 mm ( 1 2 in) exiencled range 300-mm (12 in; exiencled range 380-mm ( 1 5 in) extended range 380-mm (15 in) low Irequency
45 Hz
D208 ?00 mm (8 in; oxlonried range 55 Hz
ll system luring 15 nigrer than 'Konvrended Icr the Cudsccakor cover a portion 0' tne con or lengthen me duel 11 one is sed Conversely, ll system tun ng is 'ovier lhan recommended made the Den large' or shorten tne di-ct When Ituniro e pass*ve radiator begin /,ith le.ver tuning wffghts than recommended for the enclosj'e vo'urne Aoa Wfegllts 0 system tunny IS Huher than tccommenc&a. rcmnve weighis f trie system tuning .5 lo/.or -nan ne&red A par-ri.e raflarr.' .-an he Mmpnranly mounted inside Out SO tro tuning AeiQhis are easily ai-Ltss-blc. AdGi[io;'4il WUSIIGIS ucod in comunclion v;ill 1 lite wights supplied it** aid in ittxaitiir.g precise tuivng
Recommended Tuning Frequency For JBL Loudspeakers
Model Descripiton Enclosure
Tuning Irequency
124H 136H
300 mm (12 in) low Irequency 380 mm (15 in) low Irequency 26 Hz
LE8T-H LEI0H LEI4H LE15H
200 mm [8 in) full range 250 mm (10 in) low frequency 360 mm (14 in) low frequency 380 mm (15 in) low frequency
32 Hz
DI30H 13011
380 mm {15 in) extended range 380 mm (15 in) low frequency
45 Hz
D208H 200 mm (8 in) extended range 55 Hz
1' sys»m luring '5 htg»ef man recommended lor iho lOjOspaaVer cover a ponon o? :ne port or lengthen the duel il one is ccO Coflve'seiy. il system tumny tB tower than recomrnended make Hie pun larger or shorten the duel When luning a pas>va radiaiot IXg.n wflh fe^er lumrG. v/C;giil!> lhan recommflndedfoi" the enclosure volume Add .veirjhts it Sv-aorn lurwig ts higpgr man rocomrifc-nded remnve -.sophls il l»ie ayaleni tjmng * lo*er man desirea A pass.ve radtaior can bo temporarily moipred 'nside oui so me iiir ng /.eighth arc oasiiy accession Additiona;-wasne's usco in conjunction vnth me v/eghis supplied win and In cttaming orec-se lumng