12 in - 12.9 in Separate Speakers

The Bottom Line: The able Polk Audio PSW111 subwoofer delivers seamless bass despite its compact size.

Specs: subwoofer, 11 in x 13 in x 12.1 in, Black, Active, 150 Watt

The Bottom Line: If you don't mind its uninspired aesthetics, the Definitive Technology ProSub 800 is a mighty little subwoofer and a fine match for its SSA soundbars and ProCinema satellite speakers.

Specs: subwoofer, 10.3 in x 15.7 in x 12.9 in, Active, 300 Watt

The Bottom Line: Up front or at the rear in a surround position, this little speaker serves up sweet sounds.

Specs: 7.4 in x 10.5 in x 12.7 in, Black, 2-way Passive, 8 Ohm, 88 dB

Specs: subwoofer, 15 in x 17 in x 12 in, Active, 100 Watt

Specs: 6.9 in x 8 in x 12.5 in, Black, 3-way Passive, 8 Ohm, 86 dB

Specs: in-wall mounted, 8.6 in 12 in, White, 2-way Passive, 8 Ohm, 89 dB, 100 Watt

Specs: bookshelf, 7.9 in x 8.4 in x 12.6 in, 2-way Passive, 6 Ohm, 87 dB, 60 Watt

Specs: 8.4 in x 8.3 in x 12.5 in, 2-way Active, 10 KOhm

Specs: bookshelf, 7.4 in x 11.5 in x 12 in, Cherry, 2-way Passive

Specs: 7 in x 11.5 in x 12 in, Cherry, 2-way Passive, 8 Ohm, 89 dB