Kicker DSC50 5.25-Inch (130mm) Coaxial Speakers, 4-Ohm bundleDS Series 5.25" Coax The DS 5-1/4-Inch Coaxial Speakers are a perfect upgrade for your car doors. A stamped steel framework supports a ribbed, UV-treated foam surround and rigid polypropylene cone with EVC (Extended Voice Coil) technology, for excellent sound – even with a factory radio. These DS speakers work best with 50 watts of recommended power. See below for more details. Specifications WOOFERS [in, mm]: 5-1/4, 130 MIDRANGES [in, mm]: N/A TWEETERS [in, mm]: 1/2, 13IMPEDANCE [Ohms]: 4 MAX REC. AMP POWER [watts peak]: 70 MAX REC. AMP POWER [watts RMS]: 6-35 SENSITIVITY [dB 1w/1m]: 90 FREQ. RESPONSE [Hz]: 45-20k MOUNTING DEPTH [in,mm]: 1-7/8, 4.8 MOUNTING DIAMETER [in, mm]: 4-1/2, 115 GRILLES: yes