Crossover with variable slope and time delay

I am considering the addition of room correction as well but at this point it is of secondary import. It would be nice to have but its absence is not a deal-breaker.

OP Eriks solution is a great way for around 150.00 or so. 

I've used Dayton's.

I currently use Behringer DCX 2496, as an active XO for bass management.

WHY? here is the deal for bass drivers and dampening to work (overshoot). The amp has to be directly coupled to the drivers. NO passive XO. Anything between the driver and the amp including long or small speaker cables.. This is where Heavy copper and short runs are your friend..

Once you clean up the BASS mess, correctly, everything else will work perfectly with passive crossovers in the mids and highs..

300 hz and down.. is alway a mess. I've tried and still have GRs OB servo system. To tell the truth my Behringer set up is better. 

It will control 6 amps for 6 bass units.. I use MB columns and med large double driver passive subs. (4.5 QF). 

Full blown active DSP, daisy chainable, threashold, time delay, at least 20 types of XO from 1-4 order, summation for a third channel, mic tap for laptop visual and correction.. OTF correction.. 300.00 usd.. NEVER had one fail.. BTW there is a guy that will hot rod the heck out of one, for about 1K..

15-20 years now.. Serious piece of very flexible gear.. Great for building Passive XOs too.. It's what I use..

Time to feed the chickens..

Regards

I mention room correction not for the room correction but for the automatic subwoofer configuration.  Without some experience and tools this is not trivial and ARC systems can do this exactly right every time.

Understood.  It is daunting to try to match everything by ear alone, recognizing that I have now opened up Pandora's box for those who will say you should only trust your ears.  My feeling is the ARC should get one close and then tweak by ear. I have tried the subwoofer crawl and found it did not lead to significantly different placement than my room dimensions, openings, furniture and wife had already defined. I Guess I'm either lucky or deaf.

I appreciate the option of the miniDSP and Behringer.  Makes separates or an integrated with pre-out/amp-in more attractive and greatly increases my options.