Roswell R1 650.4 Marine Amplifier Roswell Marine amplifiers feature calibrated crossover controls with differential RCA inputs for maximum noise rejection. Rated a Class-D amplifier, the design ensures low current draw from the battery whilst delivering increased power to the connected audio equipment. With nickel plated wire terminals and a fully conformal coated PCBs making this audio amplifier ready to stand up in marine environments. Roswell amplifiers feature a space saving stackable design