System very bright after adding Mcintosh amp

I'll hazard a guess as to why the B&W's sound bright with the McIntosh amplification: Perhaps the B&W's have a varied impedance, and the due to the McIntosh's use of auto-formers, the dBW output of the McIntosh amps is higher into higher impedance at the B&W's higher frequency response, and the dBW output of the McIntosh amps are lower into the B&W's lower impedance at lower frequencies?

Unsound-- that's a good thought as the b&ws do have varried impedance, but unless I'm mistaken, I don't believe the mc7205 has the auto transformers. I don't think MAC introduced those until the mc205/207

The MC7205 does not have autoformers and neither do the MC205/207. They have only made one amp with more than two channels that uses autoformers and that the 3 Channel MC303. 5 Autoformers for one wouldn't fit and the amp would require a forklift to move. Jastone you only have a 4 or 8 selection to choose from and a input variation selection for each channel on the 7205. But I seriously doubt these settings are creating the issue you seem to be experiencing. Were you able to contact Mc or Audioclassics today?

Theo-- had a few unexpected things pop up at work Monday and today so didn't have much free time. Hoping to get in contact with them tomorrow...

Stupid jobs! Always get in the way of what really matters:) Oh that money thing.