Massive bottom to make it go boom.
The EAW LA128z is a dedicated subwoofer audio speaker with two 18" transducers in a trapezoidal enclosure. Tuned enclosure venting improves LF response, and the addition of an MX Series processor with factory settings can further optimize performance. The LA128z subwoofer is engineered to complement the LA Series full range systems or any full range loudspeaker. Recessed cups on the top accept the footpads of an LA325, LA460, or another LA sub.