Bi-amping Rules

Thanks for all the inputs. I have experimented bi-amping my Aerius i  using few different amps, all SS, and could never get it to sound right or better than a single (good) amp.

Kalali, my dealer recommended a pair of Aesthetix Atlas stereo amp for vertical bi-amping.  It's a hybrid amp with a built in crossover. 

I am working on a plan to try them out in next month or so. 

Agree with those who say that you really have to have an active bi-amp system for it to make much sense.  Some benefits can be achieved with a passive vertical bi-amp which of course assumes you are using two identical amps.  Otherwise, you need an active crossover.  In my system, active crossover low passes the bass below about 8O hz to a high power class D stereo amp then to a pair of 10" woofers for each channel; and high passes the mids and highs to a tube amp that drives the (almost) full range drivers. This does introduce lots of complexity and requires lots of outlets and cables.  The system to my ears sounds wonderful but there are many places for gremlins to rear their ugly little heads, which per Murphy, happens on occasion. 

In my case, the music I listen to does not have an overwhelming amount of very low bass content so most of the information is reproduced by the tube amp.  The class D amp is really for all practical purposes, a sub-woofer amp and in fact, the active crossover I use (NHT X-1) was designed primarily to use ahead of a subwoofer. 

there are four descent ways:

1. The best one is not to biamp at all and use single amplifier of sufficient power or monoblocks.
2. Active speakers are usually bi-amplified or can accommodate an external amplifier along with built-in, because they have ELECTRONIC CROSSOVER
3. Replacing built-in crossover with electronic and use same or different amps
4. Mating amps of the same brand with existing passive built-in crossover.

bi-amping my B&W 803Ds, Kebshcul 35W per channel mono blocks on the mids up, and crown 1502 on the bottom end, sounds wonderful, I think the key may be that the crown has input sensitivity, can dial it in.