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Old 03-08-2013, 05:17 AM
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skamp skamp is offline
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No, I don't mean volume. High output impedance can cause frequency response variations. See:

Clip+ (0.5Ω) with my Shure SE425 IEMs:
http://outpost.fr/rmaa/Clip-Shure_SE425.htm

iPod Classic (5.5Ω) with the same IEMs:
http://outpost.fr/rmaa/iPod_Classic-Shure_SE425.htm

EMU 0204 USB (23Ω) with the same IEMs:
http://outpost.fr/rmaa/EMU_0204_USB-Shure_SE425.htm

My laptop's onboard audio (74Ω) with the same IEMs:
http://outpost.fr/rmaa/ALC663-Shure_SE425.htm

In those examples, you can see the mids and highs being emphasized in increasing amounts, as the output impedance increases. You'll get different results with different cans.

All of them have a flat frequency response, when unloaded:
http://outpost.fr/rmaa/Clip.htm
http://outpost.fr/rmaa/iPod_Classic.htm
http://outpost.fr/rmaa/EMU_0204_USB.htm
http://outpost.fr/rmaa/ALC663.htm

Last edited by skamp; 03-08-2013 at 05:23 AM.
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