Power acoustik - 6.5" 3-Way 400 watt (150 watt rms power), 4 ohm coaxial speaker pair with carbon fiber injected polypropylene cone, 1" voice coil on aluminum former, 1.2" Balanced dome midrange, 3/4" soft dome super tweeter. Features treated woven cloth surround, 92 db system efficiency, 65-20khz frequency response, increased efficiency diaphragm, over compensating motor structure improves low octave bass response, multi-driver midrange & tweeter for dynamic sound & performance, quick disconnect wire terminals & custom grills. Mounting depth: 2.1"