Wyred 4 Sound experience with 804Ds

I purchased a W4S ST-500 a couple of months ago for my 804Ds. I found an immediate improvement on my NAD amp in terms of soundtsage depth and width, clarity and detail from lows to highs. What I have noticed though is that, music dependent, the sound's can be little cold and lean. With warmth in the recordings it's not an issue and the sound is fantastic. I don't use a tube pre.

I thought I'd mention this for the benefit of those considering a W4S amp, and potentially other Class D amps. I suspect that these amps work best with "full bodied" speakers, and there might also be a lot to be said for synergy with tube pre's. In my case I'm sniffing around a Mcintosh MC302 to bring some of the warmth I had with the NAD back. I can absolutely see why these W4S amps are so highly praised, but my experience suggests there might be room for some qualification/care when choosing them.

Any experience from other 804D owners also valued.