Quote:
Originally Posted by
Icecube1
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Here is a typical soundcard FR (below), before calibration (48kHz sample rate). Above 3k it starts to become less flat. However, it maybe looks worse than it is, check out the scale! (~+/- 0.2dB, 20Hz-20k). Your laptop soundcard of course will be different?, just so you are aware.
That soundcard is (roughly) +/- .1dB from 30Hz up to around 20kHz..... and above and below those (so 20Hz to 24kHz is only off by (again roughly seeing as the graph is not accurate below +/- 1dB) +.1 to-.3dB max. IMHO a 1/3dB variance is a non issue..
I would not bother calibrating a card that was that close to being spot on.
The huge dip beyond 24kHz is meaningless, as is the drop off below 20Hz for the purpose of analyzing a small control room for treatments.
Rod