Klipsch Synergy SUB-12 Subwoofer Speaker (Single, Black) (Discontinued by Manufacturer) A masterpiece of sound and design, the Synergy Series SUB-12 subwoofer shakes things up with its rock-solid performances. Its extraordinary power adds a dose of "reality" to movie explosions and other special effects, as well as reveals commonly elusive lower musical tones. The SUB-10 reaches deeper and hits harder thanks to a 12" down-firing driver coupled to a highly efficient BASH amplifier that creates 300 watts of continuous power and 650 watts of dynamic power. The subwoofer's built-in, steep-slope low-pass crossover is continuously adjustable from 40 to 120Hz. An "auto power" feature enables the subwoofer to turn itself on and off (standby) automatically, based on the presence or absence of an audio signal. A blue/red dual color LED display on the front of the subwoofer indicates whether the unit is on or in standby mode. In addition to delivering a bass impact that's beyond restraint, the SUB-12 features a new industrial design that is refined and aggressive.