Zapco Monoblock ST-500XM 160mm(W) x 52mm(H) x 179mm(L) Class D Bass Amplifier (Single Channel) Power @ 1: 1 x 500 watts | RMS Rated Power @ &lt; 0.2%THD | Power @ 1: 1 x 500 watts | Power @ 2: 1 x 250 watts | Power @ 4: 1 x 150 watts Class-D Compact 12V amplifier Stable into 1 ohms or 2 ohms load Dimensions in Inches : 6.4(W) x 1.8(H) x 7(L)