So I am happy with the WAV or FLAC on my external hard drive. I am happy with the USB DAC and the amplification / speakers. The hard drive and DAC are connected to USB 3 ports. I use Foobar2000, which buffers the music file before playback. Do any physical aspects of the computer (assume Windows) have any effect on the sound? Power supply? Sound card (is it even used in the playback?)? CPU speed? RAM? System hard drive?