Def Tech’s other SuperCube subwoofers, the SC4000 is wrapped with a black grille cloth and topped with a gloss-black cap. It has a single, forward-firing, 8-inch active driver that’s pressure coupled to a pair of side-firing, 8-inch, passive, low-bass radiators. Def Tech says this arrangement provides more piston surface area than that of a 12-inch driver. Inside is a newly designed, switching tracking amplifier rated at 1,200 watts with a 56-bit, digital-signal processor (DSP) that divides the subwoofer’s playback frequency range into a number of bands. When the DSP detects distortion in one of the bands (of frequencies—not the musicians you’re listening to), it applies an appropriate amount of compression or limiting to that particular narrow band, which Def Tech claims vastly reduces audible compression artifacts.

All the extremely useful features the SuperCube 4000 has combined with its small size, exceptional musicality, and distortion-damping muscle. Definitive Technology has always had a habit of bringing together the right amount of performance with a knack for the perfect contemporary design in order to create affordable speakers that look as good as they sound (and vice versa).