I agree with Bob. To restate and expand on his point.
If you have Audyssey or similar digital room correction (DRC) in your HT electronics, a single well chosen sub (SVS and JL are highly regarded for dual music and HT use) should be more than enough for your space. The DRC will correct for destructive room effects, so you needn't worry about addressing that issue via strategic placement of multiple subs.
The ability to address room issues via strategic placement is the primary reason I'd choose multiple subs. In this respect, DRC or multi subs are an either/or solution to the same problem. You can use both (I actually do so, but for quirky system and room specific reasons), but you usually needn't do both for smooth FR in the deep bass.
While it's also true that multiple subs will - all else being equal - provide higher output for any given distortion level, in your smallish space a single high quality subwoofer should not be remotely stressed into audible misbehavior.
Marty
If you have Audyssey or similar digital room correction (DRC) in your HT electronics, a single well chosen sub (SVS and JL are highly regarded for dual music and HT use) should be more than enough for your space. The DRC will correct for destructive room effects, so you needn't worry about addressing that issue via strategic placement of multiple subs.
The ability to address room issues via strategic placement is the primary reason I'd choose multiple subs. In this respect, DRC or multi subs are an either/or solution to the same problem. You can use both (I actually do so, but for quirky system and room specific reasons), but you usually needn't do both for smooth FR in the deep bass.
While it's also true that multiple subs will - all else being equal - provide higher output for any given distortion level, in your smallish space a single high quality subwoofer should not be remotely stressed into audible misbehavior.
Marty