B&W 804s too bright

Hi all, I have just purchased a used pair of 804s in good condition. But the thing is, I find that they actually sounded a bit too bright. Before this I was using a pair of Martin Logans and had no such problem. I was thinking whether it is my other equipment which is giving me the problem.

I am running the 804s with Emotiva XPA-3 power amp, ERC-1 CDP and Marantz 6003 as preamp. In between pre and power I have a Yaqin tube buffer to add a tinge of tube taste to all.

Any suggestions?