Unlike some of the smaller subwoofers we tested, the 9723 sounds like a “real” subwoofer. Its addition to a stereo system is not subtle; it adds a lot more bass, enough to shake my listening chair when playing the deep bassline on Olive’s “Falling” or the explosions of depth charges in U-571. It even reproduced some of the ultra-deep pipe organ tones from the Saint-Saëns symphony, something most of the other subs we tried couldn’t do at all. It gave my system a nice full, satisfying bottom end without sounding boomy or annoying. “By far the best,” Geoff said, describing the sound much as I did.