Buying audio equipment for your boat can be tough, you need gear that can handle the waves, weather and sun like a champ. Sony's XM-604M is a 4 channel marine amplifier that can power an entire system. This amp has a max power output of 110 watts by 4 channels at 4 ohm and RMS ratings of 60 watts by 4 channels at 4ohm and 70 Watts by 4 channels at 2 ohm. You can also set this amp to run 5 speakers. By setting up the amp as a 3 channel you can use 2 pairs of 4 ohm speakers in parallel plus a bridged subwoofer! It’s like a 5 channel with no fader.
The XM-604M takes up a good amount of space with dimensions of 15 7/8" in width, 2 1/4" in height and 10 1/2" in depth. It also has 3 way protection circuitry which includes thermal, overload and speaker short. This amp provides Clear highs and lows with a 5-50 kHz frequency response.
To prevent corrosion and oxidization on the terminals the XM-604M has Gold plated screws, terminals and connections. The connections start with front speaker outputs with a selectable high pass filter of 80 Hz with a 12 dB/oct slope. Next up are the rear speaker output connections, the rear outputs are the only outputs that can be bridged to run a subwoofer. The rear outputs also have a selectable 80 Hz low pass filter with a 12 dB/oct slope.
To easily connect the amp to virtually any radio, Sony provides with 2 Sets of RCA line inputs for low level 4 channel operation. The amp features speaker level inputs and signal sensing for auto turn on without a remote lead.
Finally, the power connections. Sony suggests using at least 10 gauge wire for power connections, however we suggest using 8 gauge considering the maximum power draw is 50 amps.
The one drawback to the XM604 is the lack of a conformal coated circuit board so you will need to mount this amp in a location where excessive moisture will not be a problem. Sony has planned for an installation where heat dissipation will be a problem, the oversized cast aluminum heatsink will dissipate a ton of heat in ventilation limited places.
|Amplifier Topology Class||Class AB|
|Number of Channels||4 Channel|
|Total Peak Power Output||400 watts|
|Total RMS Power Output||300 watts|
|Amplifier Bridging||Bridgable @ 4 ohms|
|Minimum Impedance in Bridged Mode||4 ohm|
|Minimum Impedance in Un-Bridged Mode||2 ohm|
|Strappable Power Output||No|
|RCA Pre-amp Audio inputs||No|
|RCA Pre-amp Audio outputs||2 Pairs (Front, Rear)|
|Preamp voltage||150 mV - 10 V|
|Speaker level inputs||Yes|
|Bass Knob / Remote Gain||No|
|Built in Crossover||High-pass, Low-pass|
|Recommended Power Wire Gauge||No|
|Install (5 star for easy)|
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