R1 1000.1 Mono-Block Marine AmplifierRoswell&';s R1 1000.1 amp is a mono-block stackable Class-D design that pairs perfectly with our new R1 subs. It also features a calibrated potentiometer. This amp is powerful, like super powerful. It can run (2) R1 12" subwoofers or (4) R1 10" subwoofers. Get bumpin&';.Features: Space-saving stackable design The Lit logo power indicator lets you know your amp is receiving power Low-pass and subsonic filters (12 DB/OCT.) Switchable differential RCA inputs minimize interference and induced noise Bass boost control (0-18DB @ 45HZ) Conformal-coated PCBs Full 0-180deg phase control Nickel-plated wire terminals High-Efficiency Class-D Topology Specifications: Continuous Power (RMS): 4: 400W 2: 675W 1: 1000W Frequency Response: 10Hz - 400Hz Input Sensitivity: 0.2-10.0V HPF (High Pass Filter): 30Hz - 300Hz LPF (Low Pass Filter): 30Hz - 300Hz Bass EQ: 0-18dB @ 45Hz Subsonic Filter: 10Hz - 55Hz Dimensions: Inches: 1.90 x 7.06 x 11.125 Centimeters: 4.83 x 17.94 x 28.26