Integrating a bridgeable design the Crunch Power Zone P18004 Car Amplifier a 4-channel amplifier comes with a power range of 450 to 1800 watts for expanded functionality. With the hi-level speaker lead inputs this amplifier supports OEM radios lacking preamp outputs daisy-chain line outputs and oversized speaker terminal outputs. For Instant Maxx power output the Crunch P1800.4 Multi-channel Amplifier features rugged MOSFET power supply. The Crunch Power Zone Amplifier includes fully adjustable hi-pass and low-pass crossovers for enhanced surround sound performance. The Crunch Power Zone P18004 Amplifier’s dimensions are 10 x 2.16 x 14.96 (W x H x D).