The ZXA1-Sub 12" 700W Active Subwoofer from Electro-Voice is a compact and powerful subwoofer that's ideal for use alongside the ZXA1 full-range speaker. The subwoofer has a sturdy 15mm 9-ply wood enclosure that is braced internally for lasting durability. The 12" EVS-12S woofer is powered by a 700W Class-D amplifier for a strong, clear performance with deep bass and minimal distortion.