Borrowing from Powerbass's former ACS series, these new amplifiers offer upgraded features, terminals and a dual layer PCB all packed in the most compact chassis allowable. To accomplish this they selected SMD parts and engineered a brand new high density heat sink engineered for maximum efficiency and cooling. The result, an all new line-up of two, four, five and mono channel models that offer amazing performance and fantastic value. Ultra efficient, the PB Series amplifiers produce plenty of low distortion high fidelity audio in a footprint small enough to fit nicely in nearly any vehicle. The PB Series Amplifiers provide the perfect mix of performance and style in a sleek new compact chassis. Features: 4-Channel 480 Watt High Efficiency Class A/B Design 2-ohm Stable (4-ohm in Bridged Mode) PWM MOSFET Power Supply High Level (Speaker)/Low Level (RCA) Input Remote Soft Delay Turn On/Off Circuit Variable High/Low Pass Electronic Crossover Selectable 12dB Bass Boost EQ Protection Circuit: Impedance Over-load, Speaker Short, Circuit, Thermal Overheating, and DC Output. Specifications: Peak Power: 960 watts Power Supply: Unregulated PWM Inputs: RCA, 2 Pairs Input, 2 Pair Speaker Level Input Dimensions (in Inches): 14.8" x 7.1" x 2.0" Depth: 14.8" Channels (mono): 4 4-ohm Power: 60 watts x 4 4-ohm Mono Power: 240 watts x 2 2-ohm Power: 120 watts x 4 Selectable Subwoofer EQ: N/A Variable Subsonic Freq: N/A Equalization Boost/Cut: N/A Height: 2.0" Width: 7.1" Switchable Subwoofer EQ: N/A Subwoofer EQ Frequency: N/A Variable Subwoofer EQ: N/A Low-Pass Crossover Freq: Variable 30 Hz - 250 Hz High-Pass Crossover Freq: Variable 50 Hz - 1 kHz Crossover Slope: 12 dB Input Sensitivity: 0.25 V - 6.0 V S/N Ratio: >100 dB Total Harmonic Distortion: 0.3% @ Rated Power Strapped Output Power @ 2ohms: N/A Output Power (14.4 V) @ 4 ohm: 60 watts x 4 Output Power (14.4 V) @ 2 ohm: 120 watts x 4 Output Power (14.4 V) @ 1 ohm: N/A Frequency Response: 10 Hz - 50 kHz