Originally Posted by lids369
My professors at engineering school told us that observations rule over equations, and my observations told me the power cord and expensive DACs work better.
As has been said, observations without adequate controls do NOT rule over equations. Observations under controlled experimental conditions, may. Which, if you are the scientist you claim to be, you will understand. While changes in AC power may affect some aspects of an amplifier - changes in the CORD, should not unless one of them is faulty.
Especially use observations over equations when there aren't any equations for how music sounds.
There are plenty of equations for how music sounds. But you can do a very simple, and more objective test. Compare waveforms from the output of two dacs (using the same source - and volume matched, if no line level is available). Ideally you can compare that with the source waveform - but just comparing the two will be helpful. If the waveforms do not significantly deviate from each other - then you know what you "heard" was psychoacoustic in nature, and not actually due to the DAC.
Have you ever heard a $1500 dac? Or expensive power cables or interconnects? I have, and I'm a real scientist. ... If you guys want to be obstinate because you can't afford this stuff, go ahead and complain about sour grapes, and I'll just go out and experience the stuff.
And yes, I have listened to expensive cables, expensive dacs, very expensive amps (and speakers and headphones). And based on my observations (under both casual, and more rigorous conditions), made decisions about where it made sense to spend real money. (hint, it's not the cables, or in the DAC's unless one has features you desire and cannot get elsewhere).
Edited by liamstrain - 5/30/14 at 12:31pm