SRM1801 on August 22, 2015 | Marketing Team 18" Powered Subwoofer HIGH OUTPUT, TIGHT LOW END With 1000W of chest-pounding low end, the Mackie SRM1801 is the perfect sub for your SRM450/SRM350 system. The ported bass reflex design produces the tight low end your live application demands. The ultra-efficient Class-D amplifier delivers the lightweight, portable sub you are looking for, without compromising the power and performance you need. 1000W of ultra-efficient Class-D Fast Recovery™ amplification Mackie Active electronics provide total system optimization Precision crossover (125Hz) Tuning filters for accurate bass response 18-inch woofer delivers superior output and low- frequency extension Dual XLR inputs for mono or stereo applications Stereo high-pass and full range outputs User-adjustable level and polarity controls Individual power, signal, OL, and thermal protect indicators Pole receptacle for mounting full-range loudspeakers Solid plywood enclosure with high-durability, textured black paint Extremely lightweight and portable (73 lbs / 33.1 kg)