DB BASS INFERNO BI40 4-WAY SPEAKERS (4") SILVER POLY-INJECTED CONE WOOFER FOR RICH BASS RESPONSE WITH BUTYL RUBBER SURROUND; 1.25" MYLAR(TM) MID-RANGE; DUAL .5" PIEZO DOME TWEETERS; NOMINAL IMP: 4_; 4" ; 150W MAX; FREQ RESP: 45 HZ - 20 KHZ; SENSITIVITY: 89 DB; PAIR