System very bright after adding Mcintosh amp

What amp were you using prior to the 7205? I owned a 7205 and used mainly for center and surrounds at the end of my time with it. I was using a MC352 for the fronts, but prior to that the 7205 was driving all 5 channels and they were Infinity Kappa 7's, a bright speaker. I can't recall it being overly bright or poor quality. I will add that the MC352 had an entirely different sound. One I attribute to the power but also the autoformers.But if you are getting a bright sound of B&W speakers, I would question that particular amp. Do you have a McIntosh service center in your area that you can have it checked out?

It's kind of odd to hear about a McIntosh amp sounding bright or brittle, there reputation is somewhat opposite. I had a similar experience with a Levenson amp that was not known for being bright either, changing the power cord and interconnect solved the problem. Have you tried different cables, cords, ect? It could be that your amp is just more revealing of other things in your system.

As with all things involved with audio it may be simple or could be something further down the chain. I had a few amps from the mid to late 90's, Mc 300 and Mc 500 in that era were warmer sounding than current crop. If your 7205 is bright something is off. I used the 4 ohm tap with best results with any speaker/ amp combo, try that if not already on 4 ohm tap. Another cause could be when you switched out could the speaker wires became loose or became inverted at the neg/pos terminals?