PowerBass XL-4165M 640 Watt RMS 4ch PowerSport Amplifier The XL series was developed for the growing Power Sports market including UTV and Marine applications, where electronics must withstand harsh damp environments. The circuit boards have been conformal coated with a layer of transparent material that protects the parts against moisture, dust and extreme temperatures. These ultra small weather resistant amplifiers are ideal for all types of outdoor audio applications such as motorcycles, golf carts and off road vehicles. But the small size also makes these amps a great choice anywhere space is a premium. Features - • 640 Watt High Efficiency Full-Range Class D Design • 2-OHM Stable Stereo Amplifier • International Rectifier Chip Set • Ultra Low Current Draw • Double Sided Copper Plated PCB • Conformal Coated PC Board • PWM MOSFET Power Supply • Digital Sound Optimization Circuitry • High Damping Control Circuit • High Current Voltage Ripple Rejection Circuitry • 3.5mm AUX Input • Remote Soft Delay Turn On/Off Circuit • Variable Low/High Pass Electronic Crossover • Variable 12dB Bass Boost EQ • Variable Gain Control Specifications - • Selectable Subwoofer EQ: 0-18d B Gain @ 45Hz, Rear Ch. • Inputs: RCA (speaker level compatible)/3.5mm Mini Jack Input • Equalization Boost/Cut: 0 - 18 dB • Subwoofer Frequency Range: 10 Hz - 400Hz • 4-ohm Mono Power: 320 watts x 2 • 4-ohm Power: 80 watts x 4 • 2-ohm Power: 160 watts x 4 • Subwoofer EQ Frequency: 45 Hz • Low-Pass Crossover Freq: 40 Hz - 400 Hz • High-Pass Crossover Freq: 40 Hz - 400 Hz • Peak Power: 1280 watts • Crossover Slope: 12 dB • Dimensions (in Inches): 9.6" x 4.5" x 1.6" • Input Sensitivity: 0.25 V - 10.0 V • S/N Ratio: >85 dB • Total Harmonic Distortion: 0.04% at Rated Power • Output Power (14.4 V) @ 4 ohm: 80 watts x 4 • Output Power (14.4 V) @ 2 ohm: 160 watts x 4 • Frequency Response: 10 Hz - 40 kHz