Newbie setting up 3 subs

Hi folks
My first preamp was a Fosgate M3A, then I used an Acurus ACT-3 for a few years. Just bought the 990, and I can't wait to hear this puppy perform.
Here's the other audio components of my system:

Parasound HCA 1200 II
Parasound HCA 1206
Snell LCR 500
Snell HCC 500
Snell Surr 500
Snell Sub 550

I've owned this THX gear for over 12 years, and I still love it. But I'm not very audio-savvy when it comes to setup, so I have a couple of questions, and I hope someone familiar with these speakers might offer me advice.
First, I was planning on setting all these speakers as "small". Would that be reasonable?
Secondly, I actually have 3 of the Snell subs. In my former setup, I used 2 at the front, and the third at the rear of the room. I've previously used external crossovers to manage these, feeding the crossover for the rear sub from the output to the rear surrounds. When setting up the 990, what advice would you have for me regarding 3 subs? I'd be OK with ditching the external crossovers if I could accommodate them with the 990 outputs. Would it make any sense to use a splitter for one of the 990 sub outputs, feeding the 2 front subs, and use the other sub output to feed the rear sub?
I'd appreciate your advice, and thanks for your time!
The Tanglewood Bijou: my home theatre makeover

Small is probably the way to go for the Snells, but I couldn't find any specs online for the frequency response on these speakers. If you or anybody else knows what the -3dB point is for these speakers, we can make some good educated guesses for crossover points to start with on the fronts, center, and side surrounds.

There are a number of ways to set up those three subs. The easiest way is to split one of the 990's two unbalanced subwoofer outputs to feed the front subs and use the other unbalanced sub output to feed the back sub, and this is going to be a pretty decent approach. All three subs will get the LFE channel from 5.1 sources as well as low frequency material crossed over from the mains.

Thank you, gonk, for your quick reply!
I've e-mailed Snell customer support asking them for the frequency response data. I'll get back to you when I hear from them.
Cheers!

Hi gonk,
Here's the info I've received so far from the helpful folks at Snell:
The LCR & HCC 500 Frequency Range: 80 Hz to 20 kHz Crossover Point: 2.75 kHz.
The SUR 500 Frequency Range: 125 Hz to 20 k Hz Crossover Point: 300 Hz, 2.7 kHz.
The SUB 550 does not have an active crossover The Frequency Range: 20 Hz to 80 Hz.

I should be receiving a fax with more information. Perhaps I can scan and forward this to you, too.
Cheers

These are some pretty good numbers, actually - assuming they are going with -3dB as their gauge for the frequency response range, we can take those low figures (80Hz for the LCR and HCC, 125Hz for the SUR) and determine crossover points. I'd look at 100Hz or the fronts and center and 150Hz for the surrounds as a starting point. You might consider trying 80Hz for the fronts and centers and 120Hz for the surrounds just to see how it compares.

Thanks, gonk
I appreciate your help!

LOL - 3 subs!!! All the same? Stack them vertically! That would awesome. The power! The beauty!

;-)

I'm kidding... but only a little. I wonder what kind of excellent standing waves you'd get with those puppys reinforcing and cancelling like mad. Hell - you could try it just for fun... do it! Do it!