Roswell Marine Audio Amplifier Owner’s Manual
REV. 02-Feb-14
Important:
The performance of your amplifier is reliant on using high quality marine grade wiring
components. There are inherent risks when using low-cost wiring materials with a high power
amplifier, most critical of which is overheating. A full RMA Wiring Kit (C920-0003) can be purchased
separately through an RMA dealer, we highly recommend using our wiring kit as it ensures high
quality wiring and fusing.
The Ground
Warning: Read the following carefully
The ground wire should be connected directly to the battery of your boat. Remember, the ground
must carry the same high current as the positive wire.
To reduce the risk of noise, run all signal cables away from any power supplying wires.
Running the Cables
Carefully run your power and ground wires to the battery. 4 AWG is the minimum recommended
wire size for this amplifier. If powering multiple amplifiers from the same power wire, verify the wire
size is adequate for the total amp draw. Roswell recommends using full spec wiring adequate for
the total amp draw from the amplifiers being powered. You must install a main fuse within 12” of
the battery rated for the total amount of amplifiers used. You must also use an in-line fuse for each
amplifier, installing it no further than 18” away from the amplifier (check your particular amplifier
model for fuse rating).
Level
Due to the wide range of head unit output configurations all RMA amplifiers have an adjustable
input sensitivity or “LEVEL” or “GAIN”. The level is not a volume control. It properly matches the
input of the amplifier to the output of the head unit and makes the amplifier more sensitive to input
from the stereo. With the level up, the amplifier will reach maximum output at a lower volume
setting on the deck. At higher level settings the amplifier becomes more sensitive to noise from the
boats electrical system. Try to run the level at the lowest setting possible for your system for the
best sound quality while still achieving full power output.
There is no correct level setting suitable for all applications as head unit preamp outputs vary.
Since speakers have different power requirements to reach the same output, the level is most often
needed to compensate for these differences.
Protection Indicator
This amplifier is equipped with an advanced protection system. If for any reason this unit goes into
protection mode it will flash a solid single red LED light found on the control end of the amplifier.
Control Panel
The control panel can be found under the cover located on the face of the amplifier. To access the
control panel remove the cover by unfastening the two screws using the included Allen key.
Crossover Controls
Note
: All frequency markings are intended as guidelines only, the only way to set these dials
exactly is with an oscilloscope.
A crossover is a device that removes unwanted frequencies from a speaker or amplifier and
enhances the desired ones. A tweeter can easily be blown by bass frequencies if they are not
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