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In article ,
says...

Hi everyone,
Here's one that probably gets asked alot, but I didn't see it on
google.
Can you biamp four post speakers using the "A" & "B" outlets on an
ordinary amp or receiver, then turning on the switches for both? Or
will the receiver simply put as much power as it has available into
the "A" (or "B")?
Does the power have to have special bi-amping capability, or do there
have to be two?

No. You can bi-wire that way, but not bi-amp. Bi-amp requires a separate
cross over.
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Alex