Model Description Sound Signature ACS T15 Analytical AKG K3003/i Natural Apple Warm, Analytical Astell&Kern ARK01 Warm, Balanced Astell&Kern ARK02 Astell&Kern AK100-111is Astrotec AM-90 Astrotec AX-7 (Excalibur) Balanced, Aggressive Astrotec AM-70 Balanced Astrotec AX-30 Hybrid, single BA, single dynamic Mid-Centric, Bass-Enhanced Astrotec AX-35 Hybrid, single BA, single dynamic Astrotec AX-60 Atomic Floyd SuperDarts Hybrid Bass Heavy Audiofly AF78 Warm Audiofly AF120 Part of the Performance Series "Pro" version of the AF78 Audiofly AF140 Audiofly AF160 Part of the Performance Series Audiofly AF180 Part of the Performance Series Audio-Technica ATH-CK9 Audio-Technica ATH-CK10 Analytical Audio-Technica ATH-CK70PRO Balanced, Analytical Audio-Technica ATH-CK90PRO Audio-Technica ATH-CK90PRO MK2 Uses "acoustic horn" nozzle design. Audio-Technica ATH-CK100 Mid-centric Audio-Technica ATH-CK100PRO Audio-Technica ATH-IM01 Audio-Technica ATH-IM02 Neutral/Balanced Audio-Technica ATH-IM03 V-shaped Audio-Technica ATH-IM04 Downsloping, mid-centric Auvio (Radio Shack) Armature version of the Dynamic Ear Company Inōr DS-11 tuning filters: bass-boost, reference & high-boost Dual-Driver In-Ear Earphone (MA850GB, ME186LL/A) Most affordable dual driver in-ear at the time of release i-River's Rebrand of the Final Audio Design Heaven IV Design FI-BA-SS, features removable cables and a slightly warmer tonality Clear/Bright, Analytical, Warm Midrange compensate for the AK100's 22 ohm output impedance Neutral/Analytical, Even Bass balanced armature manufactured in- house by Astrotec Balanced to Neutral Presentation Hybrid, dual-BA, single dynamic design, similar to the AKG K3003 Enhanced Bass, U-Shaped Presentation Part of the Performance Series, Hybrid Design First ATH balanced armature earphone soundstage, and detail, it is a longtime favorite of analytical listeners. Single BA earphone with "acoustic horn" design First AT earphone with "acoustic horn" nozzle design. Neutral, leaning towards dark. brighter skew compared to the original Technica. Known for being source- dependent Flagship product from Audio-Technica. Uses "acoustic horn" nozzle design. Neutral/Balanced/Analytical, Minor U-shape Balanced, leaning toward dark Uses "acoustic horn" nozzle design, revision of the CK90PRO MK2 Uses "acoustic horn" nozzle design, revision of the CK100PRO
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Model Description Sound Signature
ACS T15 Analytical
AKG K3003/i Natural
Apple Warm, Analytical
Astell&Kern ARK01 Warm, Balanced
Astell&Kern ARK02
Astell&Kern AK100-111is
Astrotec AM-90
Astrotec AX-7 (Excalibur) Balanced, Aggressive
Astrotec AM-70 Balanced
Astrotec AX-30 Hybrid, single BA, single dynamic Mid-Centric, Bass-Enhanced
Astrotec AX-35 Hybrid, single BA, single dynamic
Astrotec AX-60
Atomic Floyd SuperDarts Hybrid Bass Heavy
Audiofly AF78 Warm
Audiofly AF120 Part of the Performance Series "Pro" version of the AF78
330 ohm damper for LTD-J version 680 ohm for regular
UE Proprietary Sonion 2300
UE Proprietary Sonion 2300
UE Proprietary TWFK-60232 (WBFK)
UE Proprietary TWFK-60232 (WBFK)
UE Proprietary Sonion 2300 (Centertap, 2389)
Sonion 2389 (?)
TWFK
TWFK
GQ-30783
TWFK
TWFK (0905 Westone-Specific Code)
TWFK (0905 Westone-Specific Code)
ED-29689
ED-29689
TWFK
ED
TWFK (WBFK)
Westone-proprietary ED
Westone-proprietary TWFK (WBFK)
Westone-proprietary TWFK (WBFK)
Westone-proprietary SWFK
Westone-proprietary SWFK
Review
Model Description # of Drivers
1964Ears 1964-Q 4
1964Ears 1964-T 3
1964Ears 1964-D 2
1964Ears 1964-S 1
1964Ears 1964-V6 6
1964Ears 1964-V3 3
1964Ears 1964-V8 8
1964Ears 1964-V6S 6
1964Ears 1964-V2 2
ACS T1 Live! 3
ACS T1 3
ACS T2 Live! 2
ACS T2 2
ACS T3 1
Advanced AcousticWerks (AAW)
Alien Ears SQ5 5
Alien Ears SQ4 4
Alien Ears C3 3
Alien Ears CFR3 3
Alien Ears AE3 Same as C3, but with fixed cord. 3
Alien Ears AFR3 Same as CFR3, but with fixed cord. 3
Alien Ears C2 2
Alien Ears AE2 Same as C2, but with fixed cord. 2
Alien Ears C1000 1
Alien Ears AE1 Same as C1000, but with fixed cord. 1
Ambient Acoustics AM3
Ambient Acoustics AM4
Ambient Acoustics AM6 Hi-Rez
Canal Works CW-L51 6
Canal Works CW-L05QD 4
Canal Works CW-L31 4
Canal Works CW-L11 3
Canal Works CW-L10 2
Canal Works CW-L01 Single full-range driver 1
Canal Works CW-L01/P 1
Canal Works CW-L12 2
Canal Works CW-L51a Revised version of the CW-L51 6
Canal Works CW-L32/V Two Variants: Normal and "Vocal" 4
Clear-Tune Monitors CT-100
Clear-Tune Monitors CT-200
Bass-Enhanced, Stage-Use Version of the 1964-V6
Advertised specs differ on UK and US sites.
Same as AE3, but with detachable cord.Same as AFR3, but with detachable cord.
Same as AE2, but with detachable cord.
Same as AE1, but with detachable cord.
Contains a visible resistor on the faceplate
Low impedance version of the CW-L01
Clear-Tune Monitors CT-300 PRO
Clear-Tune Monitors CT-400 PRO
Clear-Tune Monitors CT-500 Elite
Clear-Tune Monitors Wood Legit Series 3
Clear-Tune Monitors Wood Legit Series 4
Clear-Tune Monitors Wood Legit Series 5
Cosmic Ears BA1 1
Cosmic Ears BA2 2
Cosmic Ears BA3 3
Cosmic Ears BA4R 4
Cosmic Ears BA4F 4
Cosmic Ears BA5 5
Cosmic Ears BA6 6
Cosmic Ears HY2 1 + Dynamic
Cosmic Ears HY3 2 + Dynamic
CustomArt Pro-Audio Series 100 1
CustomArt Music One 1
CustomArt Pro-Audio Series 330 Two Variants: S and P 3
CustomArt Pro-Audio Series 330 V2 Damperless for higher reliability 3
CustomArt Music Two 2
CustomArt Pro-Audio Series 210 2
CustomArt Harmony 8 8
CustomArt Harmony 8 Pro Harmony 8 with +15 dB in >12 kHz 8
DUNU DC4 4
EarSonics EM6 6
EarSonics EM32 3
EarSonics EM4 4
EarSonics EM3 Pro 3
EarSonics EM2 Pro 2
EarSonics EM2 Ify 2
EarSonics EM1 Not Available Anymore 1
FitEar (Suyama) Private 222 2
FitEar (Suyama) Private 223 3
FitEar (Suyama) Private 333 3
FitEar (Suyama) Private C223 3
FitEar (Suyama) Private C323 3
FitEar (Suyama) Private C435 5
FitEar (Suyama) MH334 4
FitEar (Suyama) MH335DW 5
FitEar (Suyama) Monet 4
CX2
CX3i
Advanced Horn Design, the very first vented driver in silicone, damperless
Advanced Horn Design, vented driver in silicone, damperless
First eight-driver, four-output silicone CIEM in the world
Only available in China and Singaporemore neutral than EM4 / realistic / 3D / speed / bass impact
bass response get very low / professional dedicatedthe most "neutral" and sensitive EMxsense of deepnesswell colored / spacious / bass enhanced / non aggressive Audiophile shapedbass response is prominent and smooth / natural sounding / deeper than larger
Flagship, Slightly Dark, Spacious, Deep, Highly-Resolving; Available with 'SR' = Studio Reference upgrade
Inspired by and designed specifically for anime music of the 1980s and 1990s; has its own custom-created manga avatar, Monet Sakamoto, a young, short-haired, Japanese schoolgirl with a love for music
Gui Ling (桂聆)
Gui Ling (桂聆)
CX5
CX6 6
CX8 8
HearWave Technology Single Driver
HearWave Technology Dual Driver
HearWave Technology Triple Driver
HearWave Technology iE2
HearWave Technology iE3
Heir Audio 5.A 5
Heir Audio 4.A 4
Heir Audio 3.A 3
Heir Audio 8.A 8
Heir Audio 6.A 6
Hiditon NT-RM 3
Hiditon NT-1 1
Hiditon Hear First 1
Hiditon NT6-PRO 6
Hiditon NT6 6
InEarZ (Fisher Labs)
InEarZ (Fisher Labs) IE-P250
InEarZ (Fisher Labs)
InEarZ (Fisher Labs)
InEarZ (Fisher Labs)
InEarZ (Fisher Labs)
InEarZ (Fisher Labs)
InEarZ (Fisher Labs)
InEarZ (Fisher Labs)
Jerry Harvey Audio JH5 Pro 2
Jerry Harvey Audio JH7 Pro 3
Jerry Harvey Audio JH10X3 Based on the Ultimate Ears UE10 Pro 3
Jerry Harvey Audio JH11 Pro 4
Jerry Harvey Audio JH13 Pro 6
Jerry Harvey Audio JH13 Pro FreqPhase 6
Jerry Harvey Audio JH16 Pro 8
Jerry Harvey Audio JH16 Pro FreqPhase 8
Jerry Harvey Audio Roxanne 12
Lear LCM-1 1
Lear LCM-2 2
Lear LCM-3 3
Lear LCM-4 4
Lear LCM-5 5
Gui Ling (桂聆)
Gui Ling (桂聆)
Gui Ling (桂聆)
Most neutral and accurate-sounding CIEM from Heir AudioEntry-level custom IEM from Heir AudioFlagship product from Heir Audio, with a warm, mid-centric signature and very capable bass response
Similar to the 4.A in accuracy, but with a stronger and deeper bass response; limited driver quantities, [only 10 pairs made]
Minor revision of the Ultimate Ears UE5 ProMinor revision of the Ultimate Ears UE7 Pro
Minor revision of the Ultimate Ears UE11 Pro
First model of the 'Siren Series' from JH Audio, available in universal-fit formatThree tuning options: F = Flat, B = Bass, C = ClearThree tuning options: F = Flat, B = Bass, C = ClearThree tuning options: F = Flat, B = Bass, C = ClearThree tuning options: F = Flat, B = Bass, C = ClearThree tuning options: Studio, Stage, Audiophile
Lime Ears LE2 2
Lime Ears LE3/B Bass Enhanced LE3B option 3
Livewires Single 1
Livewires Duals 2
Livewires Trips 3
Livezoner41 Yule 2
Livezoner41 Gaia 3
Livezoner41 LZ1
Livezoner41 LZ2
Livezoner41 LZ3 3
Livezoner41 LZ8 (pre-2013) 4
Livezoner41 LZ4 4
Livezoner41 LZ12 6
Minerva Mi-1 / Performer 1
Minerva Performer Pro 2
Minerva Artist Acrylic version of the Performer Pro 2
Minerva Mi-2 Discontinued 2
Minerva Mi-3 Discontinued 3
Noble Audio 3C
Noble Audio 4C
Noble Audio 5C
Noble Audio 8C
Noble Audio Kaiser 10
Noble Audio 3S
Noble Audio 4S
Noble Audio 5S
Rhines Custom Monitors Stage 3 3
Rhines Custom Monitors Stage 2 2
Rhines Custom Monitors Rookie 2
Rhines Custom Monitors Stage 5 5
Rhines Custom Monitors Stage 4 4
Rooth LS2
Rooth LS3
Rooth LS-X3 3
Rooth LS4
Rooth LS-X5 4 BA + 1 dynamic
Rooth LS6
Rooth LS8 8
Rooth LS8+ 8
Rooth LS10-1 First 10-driver CIEM on the market 10
Rooth LS12 12
Rooth (for Null Audio) Elpis 2
Rooth (for Null Audio) Elpis 3 3
Available as both universal and custom
Hybrid BA/dynamic only available through HFI.jpFlagship product from Rooth; designed by Master Xiao (now of Gui Ling); the revised LS8+ is designed by the current Rooth design team
(internally named the LS-X2 prototype)Null Audio-specific variant of the LS-X3
Sensaphonics 2X-S 2
Sensaphonics 3MAX 3
Sleek Audio CT6 1
Sleek Audio CT7 2
Spiral Ears SE1-Way Pro Similar presentation to Etymotic ER4 1
Spiral Ears SE2-Way Pro 2
Spiral Ears SE3-Way Pro 3
Spiral Ears SE3 3-Way Reference 3
Spiral Ears SE4 4-Way Reference 4
Spiral Ears SE5 5-Way Reference 5
Starkey Tunz
Thousand Sound
Thousand Sound
Thousand Sound
Thousand Sound
Ultimate Ears Reference Monitor 3
Ultimate Ears Personal Reference Monitor 5
Ultimate Ears UE1
Ultimate Ears UE4 Pro 2
Ultimate Ears UE5 Pro 2
Ultimate Ears UE7 3
Ultimate Ears UE10
Ultimate Ears UE11 4
Ultimate Ears UE18 6
Ultimate Ears Vocal Reference Monitor 3
Unique Melody Marvel 2
Unique Melody Aero 3
Unique Melody Mage 4
Unique Melody Merlin 5
Unique Melody Miracle 6
Unique Melody Mentor Available in Universal-Fit 10
Vision Ears Stage 2 2
Vision Ears Stage 3 3
Vision Ears Stage 4 4
Vision Ears Stage 6 X2
Westone ES1/ES10 1
Westone ES2/ES20 2
Westone ES3 3
Westone ES3X/ES30 3
Westone ES5 5
Westone ES50 5
Westone ES60 6
Westone AC1 1
Similar to the SE5-Way Reference, with more of a thinner, analytical presentation and lesser bass presnence/depth
Created in partnership with recording/mastering engineers at Capitol Records; designed to be as preceptually flat in response as possibleCan be tuned to personal tastes via a sophisticated DSP tuning box
Male and Female Monitoring Variants Available; uses proprietary, hand-wound inductors for low-pass filters to create the effect of filtering away all but the vocals
Westone AC2 2
Westone CR1 1
Crossover # of Receivers Country of origin MSRP Cable Socket Type
3-way 3 USA US$ 525 118 46
2-way 3 USA US$ 425 113 37
2-way 2 USA US$ 325 120 22
N/A 1 USA US$ 275 115 26
3-way 3 USA US $699
3-way 3 USA US $499
3-way 4 USA $899
3-way 3 USA $799
2-way 2 USA
3-way 2 UK/USA 112 38 proprietary
3-way 2 UK/USA 17 non-detachable
2-way 2 UK/USA 112 27 proprietary
2-way 2 UK/USA 6.83 non-detachable
N/A 1 UK/USA 17 non-detachable
USA US$ 575 124 20 UE/JH/Westone?
3-way USA US$ 540 124 20 UE/JH/Westone?
2-way USA US$ 395 124 20 UE/JH/Westone?
3-way USA US$ 395 124 20 UE/JH/Westone?
2-way USA US$ 355 124 20 non-detachable
3-way USA US$ 355 124 20 non-detachable
2-way USA US$ 345 124 20 UE/JH/Westone?
2-way USA US$ 300 124 20 non-detachable
N/A USA US$ 189 124 20 UE/JH/Westone?
N/A USA US$ 160 124 20 non-detachable
Ukraine
Ukraine
Ukraine
3-way Japan 118 25 proprietary (D-Sub)
N/A 4 Japan proprietary (D-Sub)
3-way Japan 112 19 proprietary (D-Sub)
2-way 2 Japan 110 34 proprietary (D-Sub)
2-way Japan 110 17 proprietary (D-Sub)
N/A 1 Japan 94 106 proprietary (D-Sub)
N/A 1 Japan 106 42 proprietary (D-Sub)
2-way 2 (fused w/AcuPass) Japan 109 75 UE/JH/Westone
The power necessary to bring the IEM to the specified volume, typically measured at 1 kHz.
The transducers.
In-Ear Monitor: A miniature headphone small enough to fit partially into the end of the ear canal, and typically light enough to stay in place purely by friction and seal.Custom eartips are available for some models of universal IEMs, effectively making them a hybrid between universal and custom -- at least until the custom tip is replaced with a conventional one again.IEMs because of their inherently bespoke nature; They tend to be larger and are often able to accommodate more drivers, electronics, or driver tubing, ideally to provide better sound quality.The input impedance of the IEM, a phase-dependent function of electrical resistance and reactance, typically measured at 1 kHz.
The mechanisms that contain drivers. Some receivers, like the TFWK, DTEC, or Sonion 3300, contain more than one driver.attached to the IEM's cable exit to help keep the cable shaped to the profile of the ear. Some IEMs are designed so that the cable can be used either way.Vented IEMs will have very little isolation. Some IEMs, such as the customs made by Alien Ears, have optional adjustable ambient noise ports.