The new PBM Series Mini Amplifiers are the latest development from the engineering department here at PowerBass. We set out to make the world of "mini" amps better providing more power in less space but also providing clean output signal while keeping the current demand low and the power output high! The circuit boards have been conformal coated with a layer of transparent material that protects the parts against moisture, dust and extreme temperatures making the PBM series great for motorcycles and any install that might see dust and moisture in the installation area when space is limited but extreme power is needed. Features: 500 Watt High Efficiency Class D Design 2-OHM Stable Mono Block Amplifier Ultra Low Current Draw Conformal Coated PC Board Digital Sound Optimization Circuitry High Damping Control Circuit Variable Subsonic Filter High Current Voltage Ripple Rejection Circuitry Variable Low Pass Electronic Crossover Variable 12dB Bass Boost EQ Variable Gain Control Wired Secondary Remote Gain Control Included Specifications Peak Power: 600 watts x 1 Subwoofer Frequency Range: 10 Hz - 250 Hz Power Supply: Unregulated PWM Inputs: RCA Dimensions (in Inches): 7.3"x4.43"x2" Channels (mono): 1 4-ohm Power: 250 watts x 1 4-ohm Mono Power: 250 watts x 1 2-ohm Power: 500 watts x 1 1-ohm Mono Power: N/A Selectable Subwoofer EQ: 0-18 dB Gain @ 45Hz Variable Subsonic Freq: 10 Hz - 50 Hz Equalization Boost/Cut: 0 - 18 dB Height: 2" Width: 4.43" Subwoofer EQ Frequency: 45 Hz Variable Subwoofer EQ: 0 - 18 dB Low-Pass Crossover Freq: 50 Hz - 250 Hz High-Pass Crossover Freq: N/A Crossover Slope: 24 dB Input Sensitivity: 0.25 V - 10.0 V S/N Ratio: >85 dB Total Harmonic Distortion: 0.4% at Rated Power Strapped Output Power @ 2ohms: N/A Output Power (14.4 V) @ 4 ohm: 250 watts x 1 Output Power (14.4 V) @ 2 ohm: 500 watts x 1 Output Power (14.4 V) @ 1 ohm: N/A Frequency Response: 10 Hz - 300 Hz