12 inch twin active bass reflex subwoofer enclosure with built in amplifier perfectly matched active series subwoofer 2 x ed512a subwoofer loaded mdf construction 3 inch port delivers outstanding bass response integrated monoblock bass amplifier hardwearing tight weave acoustic carpet trim secret channel to hide unsightly wires speaker size 12 324 mm x 2 impedance 1 4 or 8 ohm rms power 600 watts max power 1800 watts amplifier type ed7300 full amplifier wiring kit included