CNET Reviews the SB-4000 Subwoofer
"The SB-4000's bass was deep and powerful, bass transients were quick, and there was no thickening or bloat. Impact and dynamics were visceral. It enlarged the soundstage. A reference-grade subwoofer that doesn't merely dish out room-rattling home theater effects, it's also very musical. I’ve never heard bass like this in the CNET listening room! I highly recommend it."