JBL AC118S Woofer - 450 W RMS - Black - 1800 W (PMPO) - 18" - 32 Hz to 250 Hz - 8 Ohm 8 Ohm impedance extracts maximum power so you will get more output from your speakers Listen to deep lows and euphoric highs with a frequency range of sound from 32 Hz-250 Hz Experience body-shaking levels without any room-vibrating reverb or excessive heat output with 450 W RMS power 18" woofer driver size allows better stereo imaging with maximum sound feasibility Offers great productivity with 250 Hz maximum frequency response 95 dB sensitivity for efficient conversion of power into sound to produce adequate audio output 21.6" height for efficient frequency access and optimal operation 22.1" width to allow maximum usage productivity and added dependability 28.35" depth to allow maximum Woofer sound output efficiency 71.21 lb Weight (Approximate) for placement, carrying, and fixing considerations