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I found this pretty interesting - not an audio application but the principle is the same. Measurements are on a CAN control bus in an grid connected inverter. Heaps of noise on the signal lines (that's another problem - still being investigated). Sorry about the measurement quality, a 10 MHz 8...

I'm looking at doing some playing around to measure frequency response of some equipment. In particular analogue vs digital EQ, and the effect of changing valves (sorry, tubes) in a headphone amp. Can anyone recommend a good USB ADC for measuring the RCA line out (doesn't have to be super...