The Diamond Audio HX1200.1D single channel 1200 watt RMS amplifier is designed for power hungry systems that require a small amp with big power. Anodized extruded aluminum heat sink provides superior thermal stability Four layer, glass epoxy circuit board for enhanced performance and reliability Audiophile grade high-tolerance components used throughout Class D amplifier technology Balanced deferential inputs for superior noise rejection Output clip indicators for precise system set-up Fully variable, 24dB per octave, electronic crossover Variable 18dB per octave sub-sonic filter Phase adjustable from 0 to 180 degrees Adjustable Bass EQ (45Hz: 0 db to +12dB) / remote level control included Top mounted controls for convenient adjustment Illuminated logo / fully concealed mounting Diamond Audio HX1200.1D Owners Manual Specs RMS Power Rating RMS Power (4Ω): 540 W RMS RMS Power (2Ω): 870 W RMS RMS Power (1Ω): 1200 W RMS Type Topology: Class D Power Supply Power Supply: Full PWM Power Supply Threshold: 10.0VDC-17.0VDC Idle Current: (0.7A) Distortion THD 4(1KH@4Ω) : 0.01% S/N Ratio(A weighted@1W): -80dBA S/N Ratio(A weighted@FP): -95dBA Input Sensitivity Low Input Level: 200mV-5.0V High Input Level: N/A Input Impedance Low Input Level: 20 KΩ High Input Level: N/A Output Stage Output Impedance: 0.0297 Ω Damping Factor(50Hz@4Ω): >250 Bandwidth(-3dB): 10Hz-300Hz Crossover(-12dB/Oct) Variable High-Pass: N/A Variable Low-Pass: 30Hz-300Hz Variable Sub-Sonic: 10Hz-55Hz@12dB Fuse Ratings ATC: 30A X 4 Dimensions Length x Width x Height(Inches): 14.25" x 7.67" x 2" Length x Width x Height(mm): 363 x 195 x 51.5