Active Crossover Recommendations

It's not the price of the Berhinger that puts me off, but the fact that it appears to digitally upsample and then downsample to do its crossing over. I can't imagine that would be good for the signal, even at 24/96. Kenn39 - what have you heard about its application?

I purchased a used Bryston 10b-sub, and will give that a shot. The distribution of frequencies that they chose is not all that suitable to my desired 120hz Xover frequency: they use:

50, 60, 70, 80, 90, 100, 200, 250, 300, 400, 500.

Bryston will change out the resistors at a cost. I will play around with the available frequencies, but think I may modify it to:

70, 80, 90, 100, 110, 115, 120, 130, 140, 160, 200, 250

The rolloff slopes are choosable b/t 6, 12 an 18 db/octave. It may be worthwhile to leave a gap between high pass and low pass, and I'm not sure how big of a gap, that's why I'm thinking of using high resolution around 115 hz, my target area. Any thoughts or suggestions?

Thanks, Peter S.
wouldn't ever do that to my signal, although it is probably very effective frequency wise.

Whoops - I guess I've been offline for a couple of days. Jeffreybehr - thanks for your suggestions. In about a month I'll have a preamp that has 2 sets of RCA outputs: 1 with caps that are selected to roll off at 80hz into my 100kohm Cary SLM70 monoblocks, and one without any filters. I will try it both ways: 1) passive filter on the high frequencies and active filter built into the subs, and 2) active filter (Bryston) on both. For now, I can only work with the Bryston, until I get my other preamp.

The sub options include: 1) a pair of TBI Magellan VII's, and 2) a single ACI Titan. The TBI's only have phase reverse whereas the Titan has fully adjustable phase. I'm not looking forward to moving the subs around, but it has to happen! The TBI is very fast, which is why I bought them (to keep up with the Quads). I needed 2 because they aren't that powerful, plus I believe in stereo subs. If the single ACI works, I would likely buy a second.

Thanks all for your comments. Check back on this thread in about a month for a summary of my results (I hope).

By the way Jeff, what is the equation for calculating the capacitance for a passive crossover frequency based on the input impedence of the amp?

Thanks, Peter