i have a question.
in this case - instead of buying an audiophelleo2 and power for about $1000 , would it be comparable just to buy a oppo 105 and use its ability where u connect a portable hard drive and play music - it can be connected by coax or toslink i believe . then u also gaing with the oppo disc playing abilities sacd/cd/dvda and bluray
The improvment Audiophilleo2 + PurePower brought to my M51 in comparison of his USB input is simply stratospheric.
If you have the means even in a stretch, it's definitly money well spent if you're looking for sublime sound reproduction with total absence of noise.
Once paid and at the first listen, you will instantly forget about the money and you will congrats yourself every listening session. To all the people who think the M51 sounds good with his USB input, believe me, you only heard about 50% of the M51 potential. This is an absolute serious statement.