Audison Prima AP 6.5 4 ohm 6.5" 17cm Car Midbass Woofer Door Speakers 70w RMSPrima AP 6. 5 4Ohm Woofer 210 W Peak Power 165 mm 4 ohm Audison Prima Audison Prima was designed to meet the interest of the car model enthusiasts who like to appreciate all the nuances of the musical message with components that are perfectly integrated in the car OEM system, preserving the most precious Prima on Audison requirement of OEM integration: space. 75 Hz resonance frequency, to extend the frequency range down to low frequencies up to 50 Hz