First, I must say that you probably have just about as good fronts and sub combo “on paper” I can imagine. It would be categorized as a dream system for me. If cost were no object, I’d probably pick that combo or the Seaton’s (and that’s just a toss up, and all theoretical based on reading a lot about all the equipment).
Second, even though it’ll be recommended sometimes to try subs relatively close to fronts for integration purposes, from a speculative standpoint (I.e., guessing!), I would not have those subs next to towers with that kind of power. No need to integrate for two channel, anyway. For HT, it would essentially be like having four subs all next to each other rather than having them spread out for smoother response, depending on how you set them up (and at the same time, I know folks have done it this way with HT setups and you may have done a lot more work figuring sub location than I know). And from an aesthetic standpoint, were you to move the subs to a different location, problem “might” be solved for you. What an interesting/fun problem to have. I don’t mean to dissuade you from the SSXXL, though. They are the right ratio of balance/output for me right now in my current room, and you could locate those at different areas of the room for four subs and uber smooth response as well.
I think Sandy generally recommends running the towers large with LFE channels going to them as well (which you probably already know—and I might be remembering him wrong). But your subs are uniquely massive, so they might be an exception to his rule (eg, I’m curious what it would be like to cross them at 30).
Third, check out GIK acoustics. They’ll give you a free room consult for acoustic treatments and they seem to have some of the better prices. With that much bass, traps may be calls for.
Have you tried putting the PSA’s in different locations of the room?
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