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Second-order high pass for main amps?

Posted by Audio Fan on October 30, 2007 at 12:17:41:
I have a pair of BESL S5 MTM speakers, which are large sealed standmounts, designed to be used with subs. I'm using them with a pair of Onyx Rocket UFW-10 subs. I've tried running the BESL's full range (-3dB @ 63 Hz), and rolling the subs in below, but that does not result in a cohesive bass, and the BESL's sound a bit stressed at high volumes when run full range.

I've been trying to find a transparent way to high pass the main amps at 70 Hz, 2nd-order BW. Combined with the natural rolloff of the main speakers, this gives a good LR4 crossover to the subs and allows the system to play quite loud without straining. So far I've tried passive line-level FMod filters, a Marchand XM44 active crossover, and a Marchand XM46 passive line-level crossover. I like the active XM44 the best, and it really is very good, but it loses just a touch of depth and imaging compared to the BESLs running full range. OTOH, the system is smoother and much more powerful at even medium volume compared to the BESL's alone.

So the question is, what's the most transparent way to roll off the main speakers (70Hz 2nd-order BW)? Phil Bamberg recommends the Behringer digital 24/96 crossover, but I don't have any faith it will sound better than the analogue Marchand. I've considered upgrading the power supply on the XM44, and maybe the caps and op amps. The tubed Marchand XM126 seems a bit expensive when all I need is a high pass filter. Any other ideas for a low/no-compromise high pass filter?