I tried using Right Mark Audio Analyzer to measure the frequency response of my Pi-DAC source with some confusing results. I used a Behringer UFO202 audio interface which is cheap but should do the job. The first graph is a loopback test to show the response of the UFO202. The second graph is Moode player and the third is piCorePlayer both via a Topping E30 DAC. Both players are showing a roll off of-3.5dB at 20kHz. Where is that roll off coming from?
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