JL Audio JX1000/1D 1000 Watt RMS Monoblock Class D Car Amplifier JX Series Monoblock Amplifier 500 rms @ 4ohms 750 rms @ 3ohms and 1000 rms @ 2ohms Unregulated PWM switching type power supply Variable Bass Boost (0 to +12 dB bass boost centered at 45 Hz) Soft start turn-on prevent clicking and popping when system turns on Dimensions: 11"L x 7-3/4"W x 2"H