Got the NAD M51 yesterday. Just usb (without power line) out of a PC it sounds really great. Some thoughts:
Bass: Strong and goes deep, yet not overwhelming the overall sound.
Mids: Detailed and lifelike. Slight "soft" sound, not any harshness.
Treble: Continuing the non-harness. Extended and present, yet not fatiguing.
Imaging and soundstage: The strongest point of this dac I feel. Details pops out on black background and the it throws a very nice,...