R1 550.2 2-Channel Marine AmplifierRoswell&&';;s R1 550.2 is the ideal amp to run an R1 tower speaker setup. It&&';;s a 2-channel Class-D design that puts out 165 watts RMS per channel at 4 and 275 watts RMS per channel at 2. It features calibrated crossover controls, differential RCA inputs for maximum noise rejection, fully conformal-coated PCBs, and nickel-plated marine-grade wire terminals.Features: Ch 1-2 calibrated crossover (FULL/HPF/LPF) Space-saving stackable design Bridgeable 2-channel design Marine-grade durability 4 Ohm Stable at 165 watts per channel High-Efficiency Class-D Topology 2 Ohm Stable at 275 watts per channel Conformal-coated PCBs The lit logo power indicator lets you know your amp is receiving power Nickel-plated wire terminals Switchable Differential RCA inputs minimize interference and induced noise Specifications: Continuous Power (RMS): 4: 165W x 2 / 2: 275W x 2 Bridged: 4: 550W x 1 Frequency Response: 10Hz - 25Hz 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 Phase Control: 0-180deg Dimensions: Inches: 1.90 x 7.0625 x 11.125 Centimeters: 4.83 x 17.94 x 28.26