Jl Audio Xd800/8v2 Xd Series 800 Watt 8-channel Class D Car Audio Amplifier 4 ohms: 70 watts x 8 chan. 2 ohms: 100 watts x 4 chan. Heavy duty aluminum alloy heat-sink OR high-density split-dome convection heat-sink for extreme heat dissipation Dimensions: 14-3/4"W x 7-1/4"L x 2-1/4"H