Roswell&';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&';. Each sold separately Continuous Power (RMS) 4: 400W 2: 675W 1: 1000WFrequency Response 10Hz - 400HzInput Sensitivity 0.2 - 10.0VHPF (High Pass Filter) 30Hz - 300HzLPF (Low Pass Filter) 30Hz - 300HzBass EQ 0 ~18dB @ 45HzSubsonic Filter 10Hz - 55HzDimensions Inches: 1.90 x 7.0625 x 11.125 Centimeters: 4.83 x 17.94 x 28.26