PSW-4 Self-Powered Subwoofer

The PSW-4 is a self-powered, dual-tuned subwoofer that incorporates
one 15" and one 18" driver, to give a frequency response of
32 Hz to 160 Hz. Being self-powered, all of the amplifier and
controller electronics are contained within the speaker enclosure. The
unit is an effective companion to the M...