A modern classic One thing's for sure - our customers love Infinity's Reference Series speakers. Year after year, car after car, options like theseReference Series REF-6532ix6-1/2" car speakersremain a popular choicefor replacing factory speakers because of their competitive pricing and superb sound. Enhanced highs Step up to a 1" edge-drivendome tweeter for smoother highs with minimal breakup. Plus, push-button tweeter attenuation gives youa "brightness" quick fix. Plus One+ woofer cone The Reference Series polypropylene woofer with its durable hi-roll rubber surround ensures you'll enjoy powerful sound every mile you drive. Its oversized cone moves more air than other speakers of similar size, adding plenty of punch to the speaker's impressive performance. Excellent power-handling These speakers will really blossom when powered by an external amplifier, but they're also sensitive enough to be a good match for a factory or aftermarket stereo. Plus, Infinity comes up with a safe way to get a little more power out of your system - these 3-ohm speakers combine with the speaker wire in your car so your car stereo sees actual 4-ohm impedance.