16 in - 18.9 in Separate Speakers

The Bottom Line: Cambridge's radical design in its Newton Series P300HD Powered Subwoofer delivers extraordinary performance.

Specs: subwoofer, 8.5 in x 17.5 in x 27.2 in, Active

The Bottom Line: This big Aperion Intimus 633-T speaker makes the sort of full-size sound that satellite/subwoofer-based systems can only dream about.

Specs: floor-standing, 10.2 in x 18.3 in x 41.5 in, Medium cherry, 2-way Passive, 6 Ohm, 90 dB

The Bottom Line: Klipsch's Synergy Sub-10 is powerful and musical, and that's not something you always find in midpriced subwoofers.

Specs: subwoofer, 14 in x 18.9 in x 17 in, Black, Active, 115 dB, 200 Watt

The Bottom Line: These foldable speakers will bring life--and a lot of music--to any gathering. Despite light bass and some distortion at high volumes, we were impressed with what we got for the inexpensive price.

Specs: 20.9 in x 17.7 in x 28.3 in, Active, 8 Ohm

The Bottom Line: RBH's mighty subwoofer delivers the goods for home theater and music.

Specs: subwoofer, 13 in x 17.5 in x 14.8 in, Black, Active, 250 Watt

The Bottom Line: This robustly built subwoofer's performance is far from state of the art, but the price alone makes it worth considering.

Specs: subwoofer, floor-standing, 12.3 in x 16.5 in x 18.5 in, Active, 150 Watt

The Bottom Line: Polk's baby subwoofer belts out tight home-theater bass and sounds sweet with music, too.

Specs: subwoofer, 14 in x 16.1 in x 14.4 in, Black, Active, 50 Watt

The Bottom Line: Mirage's midpriced subwoofer is the ideal match for its Omnisat satellites.

Specs: subwoofer, 14.7 in x 18.5 in x 17 in, Black, Active, 200 Watt

The Bottom Line: Hsu Research's most affordable subwoofer sings with micro satellites.

Specs: subwoofer, 10 in x 16 in x 19 in, Active, 150 Watt

The Bottom Line: The E250P's well-defined bass rocks on home theater and music.

Specs: subwoofer, 14.4 in x 16.5 in x 19.8 in, Active, 250 Watt