AudioControl DQDX Black 6 Channel Performance Digital Signal Processor Six input and output channels with level controls | Independent Front, Rear, and Subwoofer equalization | Fully adjustable 24dB / Octave Linkwitz-Riley selectable crossover ACR-3 Dash Control Remote Included | Discrete Input and Output level controls with clipping indicators | 12-volt Remote Turn On Output | Built in Pink Noise for easy Signal Delay and Equalizer tuning and system set-up Total Harmonic Distortion: 0.01% | Frequency Response: 10Hz-22kHz | Equalizer Frequencies (front/rear): 125Hz, 175Hz, 250Hz, 500Hz, 1kHz, 2kHz, 8kHz | Equalizer Frequencies (sub): 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100HZ, 125Hz PFM Frequency: 20Hz or 30Hz selectable | Crossover Frequency: 50Hz-500Hz selectable | Signal Delay Max (Left/Right): 10ms | Signal Delay Max (Front/Sub): 35ms Dimensions: 5.75"W x 9.25"D x 1.25"H