Details The 800.4 EVO 4.0 amplifier comes with exclusive patented *DTR technology. The DTR* is a dynamic thermal recovery system that makes the amplifier always maintain high efficiency by accelerating the thermal exchange of electronic components with the heatsink. Do you know what that means? An even more reliable and tough product for you! * Global patent technology required by SounDigital TECHNICAL SPECIFICATIONS 800.4 EVO 4.0 4Ω Power @ 12.6V @ 2Ω: 4 x 200 W RMS Power @ 12.6V @ 4Ω: 4 x 132 W RMS Power @ 14.4V @ 2Ω: 4 x 223 W RMS Power @ 14.4V @ 4Ω: 4 x 147 W RMS Power in Bridge @ 12.6V @ 4Ω: 2 x 400 W RM Thd + N - (10% rated power): 0.1% THD + N - (100% rated power): 1% Frequency Response: 10Hz – 20kHz Crossover: LP / HP: 80Hz 12dB/8th Damping Factor: 200 Maximum Consumption: 80A Dimensions (CxLxA): 14.8 X 11.3 X 5.0 CM Weight: 0.66 kg