I got one of those older SVS cylinder subwoofers many years back (SVS 20-39 PCi) and want to add a second subwoofer to my room. My room is maybe 11x11, so this subwoofer is already overkill for it, but I was never completely happy about the unevenness of the bass in my room, even after installing a couple bass traps.
When I talk about "unevenness", i mean two things 1) the common problem in which certain parts of my room have different levels of volume and 2) certain frequencies sound louder than other frequencies (Modal frequencies i think they are called.), For example 50hz is quieter at my listening position compared to 80hz; this is also reflected in my microphone measurement (REW + Minidsp mic).
Will adding second subwoofer help to solve BOTH these issues or only one of them?
Second, is which subwoofer should i get for the second one? I'm guessing another ported SVS 12" subwoofer with similar specs since it is commonly advised to get an identical subwoofer, but I've also played around with the idea of adding a smaller sealed woofer just to have that bit of better bass response and control.