Need a new amplifier. Need a good match for my Audio Research LS7 preamp

@hansk46 .....very good point.  IIRC that would rule out the Muse.  Belles and Classe still viable options.  soix's McCormack recommendation is even better imo as you do get a more refined and neutral amp with the correct input impedance.  The McCormack is an amp that can be partnered with many different speakers.

Also IIRC, the ARC LS7 has a higher than average gain ( at least mine did ) which could be contributing to more glare and brightness especially at higher volume.

Best and keep us posted.

j200jr,
The later Classe CA-200 with the heat sinks on the side are reported to be much better than the earlier model with the heat sinks on the back because of "distributed capacitance" - caps distributed over the circuit board instead of just at the power supply (as I understood it), and equal to the replacement CA-201. There was a later version of the CA-201 that was said to be much smoother. It has aluminum "pillars" at the front corners. I had the earlier version and it was a bit coarse. Classe was said to be a good match for B+W.
You haven’t mentioned your cables so I will add that better cables could give you more clarity. Recently I upgraded my speakers and have a bit of glare at higher volumes too. Until I can demo cables I have stuck Post-it notes over the tweeters. It works surprisingly well, costs nothing and puts the fun back into listening. Good luck on your quest.
Bill

I believe the amp Ralph (atmasphere) was referring to is the Music Reference RM-200. In it’s current Mk.2 form it retails for $7995, and can very occasionally be found used (it’s a keeper!) for around $3000. The original non-Mk.2 version goes for $2000 or so. Nice amp, which Michael Fremer reviewed in Stereophile a few years ago, putting it in it’s Class-A Tube Amp category recommended components list. Heed hansk46's advice regarding input and output impedances---the RM200 is XLR/balanced inputs only, at 30kHz ohms.