[Wayne A. Pflughaupt]

We'll have to agree to disagree then
It minimises a rats nest of room nodes and sounds great, especially on movies. Is also quite enveloping in 2ch

Have you graphed combined response of your subs? If you haven’t you might be surprised at the results. Some argue that single corner placement best overcomes room modes, others argue that multiple subs around the room do it. Assuming the latter is correct, having subs in multiple locations can cause a whole new set of problems if they are not symmetrically placed. The sound arriving to the seating position at different times can cause ragged “sawtooth” response.

Like Bruce, my experiences with double separated subs hasn’t been good either. I liked the “enveloping” sound you mentioned, but suffered from the problem that our Moderator brucek rightly describes as “dumbed-down” response, which is an extension penalty due to one sub being less substantial than the other. In my case it was due to the fact that one was in a corner, and the other by an open hallway.

You probably have the same situation with your smaller rear sub. This old post of mine explains the situation further, with graphs to show what happens to overall response when small subs are used with large ones.

Every room is different, and I have seen some people claim to have excellent response with multiple subs placed all over the room. (Haven’t seen them post any graphs, though.) Nevertheless, it would be a good idea to plot your response so you can see if your performance is as good as it seems to sound.

Regards,
Wayne