I tested pm 6004 (as with my spk) with B&W 684 fl.st. and it delivered good bass and smooth treble, at low volumes too.
Phono imput is like my old Quad and headphones output is ok.
I have tweaked the TV link with an attenuator and I can enjoy film tracks with a big effects sound.
Only my impressions with my old B&W and B&W 684 in store (rock and Jazz):
Yam AS 500
: very open sound , great horizontal image stage, but with too present high freq., for me; bass good only with loudness in, not very ergonomic remote and front commands; very, very easy to mark with fingers on the front (incredible!);
: good bass, but not at low volume; medium-high freq. a little bit confuse; very ergonomic and nice.
: more liquid and natural medium freq.; bass enough, but you can add something at low volume with loudness, not possible with Nad;
built like a tank in Japan, with golden input/output, smart and nice remote, that I found can drive my 20 years old CD Philips too!
MARANTZ - PM 6004