The R1 650.4 marine-grade amplifier, made by Roswell, is everything your boats audio system has always wanted. These stackable amplifiers utilize a 4-channel Class-D design, that puts out 100 watts RMS per channel at 4Ω, and are perfect for powering your R1 6.5″ marine speaker setup.  Easily bridge & tune with the calibrated crossover controls. Because LEDs create lots of noise issues, this amp features differential RCA inputs for maximum noise rejection. The R1 650.4 is built with fully conformal-coated PCB’s and nickel-plated marine-grade wire terminals to ensure their quality.
 
Features
Ch 1-4 calibrated crossover (FULL/HPF/LPF)
lit logo power indicator lets you know your amp is receiving power
Bridgeable 4-channel design
Marine-grade durability
2 Ohm Stable at 165 watts per channel
Space-saving Stackable Design
Switchable Differential RCA inputs minimize interference and induced noise
High-Efficiency Class-D Topology
Conformal-coated PCBs
Nickel-plated wire terminals
 
Specifications
CONTINUOUS POWER (RMS)
4Ω: 100W x 4
2Ω: 165W x 4 
BRIDGED
4Ω: 300W x 2
FREQUENCY RESPONSE
10-25 kHz
INPUT SENSITIVITY
0.2 – 10.0V
HPF (HIGH PASS FILTER)
30Hz – 300Hz
LPF (LOW PASS FILTER)
30Hz – 300Hz
BASS EQ
0 ~18dB @ 45Hz
DIMENSIONS
Inches: 1.90 x 7.06 x 11.125
Centimeters: 4.83 x 17.94 x 28.26