Thanks Gonk.

I won't be changing the physical cabling between the three subs - for layout / cost reasons. That means all three will be driven from one output - as is now the case direct from the 950. My assumption is that this should make no difference whatsoever.

As to manual mode. I will give it a shot - eventually. Neat suggestion regarding the crossover point / your mains. In my case, I'm looking at three stacks of two speakers each, across the front, with response that's flat to below 30Hz (with a combined count of six 10" woofers - and tons of available power amp output.) Add a pair of matching surrounds and you can understand what a waste it would be to offload an octave (or so) of bass from them onto the three subs - whose three 12" drivers and internal amps are at best an equal match to the mains - in the 30-60Hz range. Having so many woofers, spread throughout the room, is likely the reason why the overall bass response in the room is already very smooth. In fact I'll probably experiment with setting all of the speaker outputs on the 950 to "large" and let the subs handle only the true LFE output. My guess is that "small" and "40 Hz" (as it is now) is still the best way to go, but using the SMS-1's display to confirm this or not is an excellent suggestion. (And I will experiment with higher crossover settings as well.)

I'm sure I'll have questions once I roll up the sleeves and get into it!

Regards.