post #1 of 1
3/23/10 at 9:45am
Thread Starter 
I thought it would be a good idea to make for access to my preferred equalizer settings with my preferred portable earphones on the iAudio 7 with its semi-parametric equalizer. The goal was as flat a preceived frequency response as possible.

Here they are:


Sennheiser PX 100

80 Hz . .. 220 Hz . . 1.4 kHz . . 1.8 kHz . . 13 kHz
Wide . .., Wide . . .. Wide . . .- Wide . . .- Normal
–11 dB ,- –6 dB . . . –3 dB . . - –6 dB . . - –


Sennheiser HD 238

80 Hz . .. 220 Hz . ; 650 Hz . ''' 1.8 kHz . . 13 kHz
Wide . .., Wide . . .. Wide . . .- Normal . .. Normal
–7 dB . ., –3 dB . . , – . . . . . . – . . . . . . –2 dB


Sennheiser IE 8 (bass tuning +½ mark)

80 Hz . .. 220 Hz . ; 650 Hz . ''' 4.1 kHz . . 13 kHz
Wide . .., Wide . . .. Wide . . .- Normal . .. Wide
–9 dB . ., –6 dB . . , –3 dB . . - –1 dB . . - +2 dB


Etymotic ER-4P (modified)

175 Hz .- 220 Hz . ; 650 Hz . ''' 3.0 kHz . . 13 kHz
Wide . .., Wide . . .. Wide . . .- Normal . .. Normal
–2 dB . ., – . . . . . . – . . . . . . –3 dB . . - +3 dB
Mach3Bass +2


Phonak Audéo PFE 112 (with grey filter)

80 Hz . .. 175 Hz . ; 650 Hz . ''' 4.1 kHz , - 9 kHz*
Normal ... Wide . . - Wide . . .- Wide . . . . Narrow
–1 dB . ... – . . . . .. – . . . . . . –3 dB . . - –2 dB
Mach3Bass +4

* The ideal center frequency would probably be ~9.7 kHz


Narrow/Normal/Wide stands for the bandwidth (Q) of the EQ band
With ER-4P and Audéo additionally Mach3Bass is used, as it provides low-bass enhancement down to 20 Hz, whereas the lowest available EQ frequency band is 80 Hz.


The following modifications are to be taken into account:

PX 100: center hole in the foam pad
ER-4P: customized foam tip (hearing-protection foam pierced with a chisel), filter tube filled with lambswool, default filter removed
Audéo: Shure «Olives» with shortened center tube instead of standard tips
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