dbx 120a Subharmonic Synthesizer - individual control for two ranges of subharmonic frequencies, separate low frequency boost circuit, separate subwoofer output, 1/4" balanced inputs and outputs, RCA inputs, front panel LEDs (crossover status & synthesis activity), patented circuitry ensures that mid and high frequencies are not affected, built-in crossover with choice of 80Hz or 120Hz crossover point. Dimensions: 19"/1U. Weight: 2.2kg