Orion CO500 Cobalt 5.25-Inch Coaxial Speaker ORION COBALT CO500 SPKR 5.25" COAXIAL SPKR 5.25" COAXIAL SPKR 5.25" COAXIAL Frequency response 110Hz-20kHz 1 voice coil (midrange driver) 4-ohm impedance and Sensitivity 87.1dB Built-in tweeter protection circuit Recessed and positionable tweeters