The result. WOW! Very big improvement. If anyone has ever contemplated attempting bi-amping, I highly suggest it.
There are two ways of passive bi-amping.
1: If you have two different stereo poweramps amps, the only way is horizontal bi-amping, put the best sounding one on the mids and highs, and the one with the biggest "nads" on the bass.
(But you need to have a volume control (passive) on the amp that has the highest gain so you can reduce it to equal to the other amp in level (gain), then use you preamp or source as the master volume control.}
http://www.av2day.com/wp-content/uploads/2014/05/biamp1.jpg
2: This is the best sounding way. If you have two identical amps then vertical bi-amping is the best, as the power supplies of both amps are available for both speakers for bass duties, and this is what should give superior bass control as well. (And no need for level control on one as they are the same gain.)
http://www.av2day.com/wp-content/uploads/2014/05/biamp2.jpg
Cheers George