McIntosh MC901's internal active crossover & speaker's internal passive crossover

@cleeds

What you are missing in your understanding is that the filter sections for each driver are independent in the classic, parallel crossover.

When the external straps are removed the individual high and low pass sections remain in place but the crossovers should not (and usually are not) have any be connected internally.

An external crossover would of course be additive to the internal crossover so it's not quite as good as having a purely external crossover, but it's workable.

Still, the risk of connecting two amps to the same bi-wire speaker is only present in rare cases when they join the grounds internally, and a balanced amp is used. 

Best,

Erik

@cleeds Wrote:

Agreed, biwiring doesn't make much sense and neither do the jumpers. 

I agree! Bi-wiring is a joke.

Mike

PS - I'm not in any way advocating for bi-wiring.  Just sharing what I know about speaker crossovers and the connectors out the back. :)

OP @ Believer

There's a lot of info here that may be relevant to your question. If you own or are looking to own these amps and are looking for info based on the specifics of these amplifiers, I can help. These are a significant investment and VERY rare in topic discussion here, so want to make sure you receive the info and perspective based on experience that will help.