? Improved-efficiency diaphragms & magnet structures;? Carbon fiber injection-molded polypropylene cones;? Treated woven cloth surrounds;? 1 voice coil on aluminum formers;? System imp: 4ohm ;? Quick-disconnect terminals;? 6.5;? 3 way;? 400W max;? 1 balanced dome Mylar(R) tweeters;? Freq resp: 65Hz-20kHz;? Efficiency: 92dB @ 1W/1m;? Mounting depth: 1.75;? Pair;