bi amp imrpoving?

Amen. That is what I meant to imply.

Kal

You can use one amp for bass and one for the highs & can still be passive. You can also use one amp for the left & one for the right. These differences are horizontal vs. vertical bi-amping.

Lots of articles around, such as this one

Kal - why do you need a custom crossover? What's wrong with a of the shelf active crossover like the NHT X2?

Mark

Active biamping is simple with as little a Dahlquist DQLP-1(still used by Marchisotto, to biamp the Alón Exotica Grand Reference system). I used (and modded in a number of ways) one over the course of almost 25 years, with a variety of systems, and excellent results. I might still have it, were it not for the present acoustic nightmare of a listening room a divorce stuck me with. A TacT RCS 2.2 has rectified the situation quite nicely though. There's an LP-1 for sale on AudiogoN now: (http://www.audiogon.com/cgi-bin/cls.pl?misceqal&1283407862&/Dahlquist-DQ-LP1-electronic-cr)

Once again, I say thanks to the experts who are willing to take the time to educate the rest of us. I haven't read the links in detail yet, but I surely will. I have a NAD C162/C272 preamp/amp combo driving a pair of Aerial Acoustics Model 7s. I have been considering bi-amping the Aerials with two Monarchy SM-70 Pros thinking that would be an upgrade over the NAD C272. It appears I need to learn more about bi-amping first.