Infinity Reference REF-6532IX/EX 6-1/2" 2-way car speakers6 1 2" 2 way car speakers Plus One+ polypropylene woofer cone with hi roll rubber surround 1" edge driven, textile dome tweeter included brackets allow mounting in a variety of 6 3 4" and 6 1 2" openings True Four Ohm Impedance technology: speaker's 3 ohm impedance combines with speaker wire impedance for a 4 ohm load compatible with virtually all factory or aftermarket car stereos handles up to 60 watts RMS (180 watts peak power) frequency response: