DB BASS INFERNO BI50 4-WAY SPEAKERS (5.25") 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_; 5.25" ; 200W MAX; FREQ RESP: 50 HZ - 22 KHZ; SENSITIVITY: 91 DB; PAIR