With its super efficient Class-bd circuit topology, the PM500X1bd will drop some serious BASS! Due to its dedicated low frequency response, this amplifier is optimized for mid-bass speakers or subwoofers only. No need to worry because its 1-ohm capability will drive a pair of 4-ohm DVC subwoofers or quad-configuration of 2-ohm DVC subwoofers with ease. FEATURES AT A GLANCE 12dB/octave Butterworth crossover High level input capable with Auto Turn-On circuit On-board Punch EQ with +18dB boost @ 45Hz RCA pass-thru outputs Optional remote Punch Level Control (PLC2) ready (w/ input clip indicator) Features C.L.E.A.N. Set-up Stealth top mounted control panel Over current protection Infrasonic filter Short circuit protection Muted turn on Marine grade stainless steel hardware Cast aluminum heatsink 2-Year Warranty Marine grade two part epoxy coating on circuit boards