Passive bi-amping works ?

1953 makes a good point which may have not been clear in my first post. The input to the amp is the full bandwidth (as 1953 correctly stated), but the load is only the hi/low that it is going to, so the demands on the amplifier as I stated in my first post are limited by the passive crossover. It will, as 1953 mentioned, make a substantial improvement.

Like other things audio, it's controversial, but like mono-blocs, bi-amping allows for use of (potentially) very short speaker cables. Many claim significant improvements with the use of short speaker cables.

My amps will be back from SMc Audio (for upgrading & matching) next week, and I'm going to use them for passive bi-amping (Vandersteen speakers cannot be active bi-amped without screwing up the internal X-over up) as recommended by Vandersteen and SMc. I'll post a short report when I've gotten some time on the system. Cheers. Craig.

I've done it with B&W 802 with tubes on top and solid state on the bottom,yes it can be done passively,and it eases the demands on the amps too.Make sure the preamp has 2 amp outputs.

If my poweramp has 4 channels and can be bridged to 2 channels, in general should I used 4 channel to passive biamp or bridge them to 2 channels. I'm asking in term of better sound quality only.

Supakit; biamping with a 4 channel amp is probably breaking new ground. I have read that "sometimes" bridging channels does not improve music quality/character. Good Luck. Craig