So, if I were to go with 2 smaller subs, what does that mean? Can I do to smaller ones for $1,000? If I go with 2 SVS 12" SB-1000 I see they have two choices, both Pro models and they seem identical, sealed for $500 and ported for $600. What are the pros and cons of ported vs. sealed?
For music only, sealed tends to be much better than ported. Ported will go deeper and louder than sealed given comparable sub drivers and sub amps, but the group delay is typically larger (making "time alignment" with the mains more difficult). The port makes the sub driver "loose", allowing it to flap with less resistance and produce more output for the same power level, but it's response is not as "tight" as sealed for music reproduction. For theater, ported are typically better because they will perform better with deep movie effects (it would take more investment to get sealed sub(s) to reproduce those effects to the same level).
You don't have any DSP for bass tuning in your system, so any benefit of asymmetrical sub placement might be difficult to realize. Having one sub, or two subs collocated with the mains, should be fine. I'm pretty thrilled with my single sub centered between the mains for my 2-channel system, but I have not tried the same system with two subs to see how that compares (WAF prevents addition of second sub) so I can't provide feedback on 1 vs 2 subs. Maybe pick up an SB-1000 and run standalone (I'm pretty sure the SVS SB subs will bury the Klipsch sub), then decide if you need another. I had a 12" version (R-120SW) of your 10" Klipsch sub briefly and was not impressed with it to be honest.
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