As for breaking in the cord, I would suggest one of those IEC to AC adapters, using it on a box fan/heater/lamp-whatever you can use it on that has a steady current draw.
As for positioning, you're prob. going to get the best results with the transport or DAC.
I would try it in ea. position for at least a week and longer if possible. Instead of immediately switching to a new position, put back the PC you were using, as that is what you're most familiar with, as to make a comparison with that piece.
I use a different PC at the CDP, the amp & preamp with good results.
As for positioning, you're prob. going to get the best results with the transport or DAC.
I would try it in ea. position for at least a week and longer if possible. Instead of immediately switching to a new position, put back the PC you were using, as that is what you're most familiar with, as to make a comparison with that piece.
I use a different PC at the CDP, the amp & preamp with good results.