First of all, Richard is completely wrong in his statement that bi-amping would give you twice the power. It would only possibly do that if one amp was twice as powerful as the other one -- and only in the frequency band in which it was used. In a bi-amp configuration, the outputs of the two amps do not add together in a linear fashion. And in the case of the McIntosh 7200 vs the Threshold, if the McIntosh amp turned out to be the less sensitive of the two amps (this may not be the case, but it could be) then you would still need a passive volume control to turn down the output of the Threshold to match the 7200.
Trich, I think you have to look at what you're trying to accomplish here. Vertical bi-amping with an identical or similar amp could help a bit, but I don't think the improvements would be that large unless you went to an external active crossover and bypassed the speaker's internal passive crossover. You are likely to get about as much benefit from bi-wiring (if you're using the internal passive crossovers) as you would from biamping -- without the extra clutter and expense for the second amp.
Also, simply buying a single, higher-quality, more powerful amplifier (and bi-wiring) could work very well. Then you could sell the Threshold and hopefully not be out too much dough. Good luck to you. :)
As I said, you really have to examine what your goals are. It may take some experimenting for you to hit that right mix of elements. But that's the fun of this hobby, right?
Trich, I think you have to look at what you're trying to accomplish here. Vertical bi-amping with an identical or similar amp could help a bit, but I don't think the improvements would be that large unless you went to an external active crossover and bypassed the speaker's internal passive crossover. You are likely to get about as much benefit from bi-wiring (if you're using the internal passive crossovers) as you would from biamping -- without the extra clutter and expense for the second amp.
Also, simply buying a single, higher-quality, more powerful amplifier (and bi-wiring) could work very well. Then you could sell the Threshold and hopefully not be out too much dough. Good luck to you. :)
As I said, you really have to examine what your goals are. It may take some experimenting for you to hit that right mix of elements. But that's the fun of this hobby, right?