YAMAHA DXS18 18-inch Powered Subwoofer. use only at home very clean and well kept . asking $1300.00 bought from long & mcquade or will trade for 2 smaller two 10" The new DXS 18 achieves best in class SPL of up to 136dB and delivers the lowest frequency 32Hz in the lineup. Equipped with a band-pass type enclosure and high power handling 4-inch voice coil magnet that drives the 18-inch woofer, the Class-D amplifier delivers 1020W of power with exceptional clarity and accuracy.