Nuforce STA200

Thanks MrD.  With vertical bi-amping, what happens (if anything) to stereo imaging if both R and L channels are powering the drivers in one speaker?

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Maybe I’m overthinking this-  if one amp’s R and L channel play thru one speaker, and the other amp does the same thing thru the other speaker, do you get the same stereo separation as if you were using one amp?

It doesn't make any difference as your perception of "imaging" is coming from the speakers.  If it makes you feel better then try it both vertical and horizontal and see if you hear any difference.  If you speakers don't need the extra muscle then don't bother.

+1 about imaging from the speakers (including the Xovers). If you might be looking to try to go as "dual mono" as possible for the best theoretical stereo separation with a pair of stereo amps then biamping vertically would be the way to go.. do that first but really best if you try it both ways as recommended by jackd.

The only possible disadvantage is that any variations in gain (unlikely) between the 2 amps will make one side slightly louder and may skew the soundstage when you vertically biamp.