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Old 03-08-2013, 05:17 AM
skamp's Avatar
skamp skamp is offline
Join Date: Oct 2012
Location: France
Posts: 235

No, I don't mean volume. High output impedance can cause frequency response variations. See:

Clip+ (0.5Ω) with my Shure SE425 IEMs:

iPod Classic (5.5Ω) with the same IEMs:

EMU 0204 USB (23Ω) with the same IEMs:

My laptop's onboard audio (74Ω) with the same IEMs:

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:

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