Powered subwoofer with 8" long throw woofer. Line in RCA/LFE; high level guillotine speaker connectors; subwoofer level control; auto/on standby switch/indicator. AP modified cabinet dampening, ruggedized solder connections, damped woofer cone, tuned for deep bass. Unit can also have an EQ mod to cut mid frequencies if requested (at extra cost). Excellent condition, except for a minor ding on the cabinet. Condition: 8+ (thermal issue in amp)