Features: 1. 4-Channel 7900 Watt Car Power Amplifier 2. Amplifier Class: Class A/B 3. Stereo surround 4. Main push four-door speaker 5. Passive subwoofer 6. Slim design 7. Aluminium alloy casting drawing process 8. External heat sink 9. Thermal Overload & Speaker's Short Protection 10. Shell with a standard safety interface put and end to bad parts 11. Aluminum alloy heat dissipation design hole design wider air-contact surface heat faster Specifications: Model: SK-790.4 Material: Aluminium alloy Channel: 4 Working Voltage: DC 12V Peak Power Output: 7900 W Peak Power Output: 2 Ohms 2000Wx 4 Channels Peak Bridged Power Output: 4? 3900W x 2 Channels RMS Power Output: 4? 120W x 4 Channels Total Harmonic Distortion (THD) RMS Output: ?0.01% Signal-to-Noise Ratio (SNR): ?95dB Sensitivity: 150mV Impedance: 2?~4? Frequency: 20Hz~40KHz Package Includes: 1 x Car au.dio Amplifier 1 x User Manual