Which Mc better Mid/High performance in BiAmp set up?

What preamp would you be driving these amps with? The reason I ask is that your MC7270 has an input impedance of only 20K, and many of the current generation McIntosh solid state amps have input impedances of 22K, or even 10K in some cases. Driving 20K and 22K or less at the same time would be a problem for some preamps, especially tube preamps. That would be true in many cases even if the preamp provides two sets of output jacks.

On the other hand, the 47K input impedance of the current version of the MC275 (assuming you would be using its unbalanced inputs), in combination with the 20K input impedance of your MC7270, would be much less likely to be a problem. Although some would say that doing so might compromise coherence between the mid/highs and the lows, given that one amp would be solid state and the other a very different tube-based design.

Regards,
-- Al

If you cant try everything first, I wouldn't even consider doing it. Biamping like that, using different amps never sounds right. Every once in a while you may get lucky, but that's not the norm. If you're trying to deal with the tweeters on your 801's, there's more effective ways to do it.

Thanks.. : )
Almarg
I have the McIntosh C29 Pre amp..which we bought new back then.
The Amps may not be compatable using the Mc7270 Solid state together with a recent Mc275 in biAmp set up..and you suggest a solid state to match instead ?
Boy..I thought getting the tube spirit directed at the tweeters & mid a good thing.