I captured the output from two different amps with the same headphone (HD800). The process to capture the waveform is indicated below:
PC--USB-->PS Audio PWD2 DAC-->[amp?]-->HD800--sound-->panny capsule mic-->ADC-->wavefile
Obviously a significant factor will be the quality of the ADC, but we will have to live with that. The three outputs also have slightly different offset, and obviously the HD800 will introduce some gross errors. But let's just look at the waveforms for fun! The three waves are the following not in order: 1) original wav file; 2) amp A; 3) amp B. I will say no more about the amps used and let you guess which is which.
Edited by purrin - 7/31/12 at 5:07pm