Audiophile USB to PCM

I had been looking into establishing a PC based music server. Many of the posts on audiogon suggest improvement in performance by replacing the transport with WAV files on PC. Other's note improvement from using USB connections. I have been comparing CD played through Levinson N390S into N32 pre Amp, and Levinson 334 Amp. My speakers are Wilson P7. I have not found the pc Audio to equal my system The Xitel Pro Hi-Fi link connected vis Toslink ton 390s DAC was just fair. The HagUsb is very good. It connects Via RCA digital to my DAC. I found that Flac at its lowest compression was not nearly as good as the best WAV file. Windows Media was not nearly as good as WinAmp set on Direct output. Foobar was closer to the real thing but Less transparent. I do not feel that the HagUSB plays a role in the change in quality In talking too its designer; there are still drivers running in windows that affects the sound. Apparently the new windows platform will reduce some of these issues.

I must say that the sound quality is still very good but not yet equal to the best.

The Sonos ZP80 has Optical and coax digital output for superior audio quality. I use it with Mark Levinson DAC, N32 Pre Amp and Wilson speakers. Not as good as vinyl but easy to play and quite good.