About: JBL MA5055 Marine 5-Channel Amplifier 

The marine A5055 5-channel amplifier delivers a powerful 50-Watts RMS to each of the front and rear speakers in your boat, and a pounding 500-Watts RMS to the subwoofer channel — a much smarter ratio of subwoofer-to-full-range power than what is typical in 5-channel amps. You can also bridge the amp to 3-channel mode to deliver 140-Watts RMS to your front speakers while driving your sub with 500-Watts RMS. Speaker-level inputs allow this amplifier to integrate into almost any system, even one using your marine's factory radio. Separate high-pass and low-pass crossovers on the front and rear channels allow you dial in the perfect roll off to best suit speaker placement and cabin acoustics. The subwoofer channel features a low-pass crossover, selectable bass boost, and phase switch to optimize subwoofer performance.

Compact size
The JBL marine A5055 amplifier features a low-profile chassis and a small overall footprint to fit in more vehicles where available space is limited.

High and low level input
Speaker-level and low-level inputs allow the marine A5055 to integrate with both aftermarket and factory marine stereo systems.

Variable crossover and bass boost
Unlike many amplifiers available at similar prices, the JBL marine A5055 features variable electronic crossovers and bass boost circuits allowing for precise system tuning and performance.

Low noise and distortion
The marine A5055 has been engineered using Balanced Differential Inputs to ensure low noise and distortion even at high output levels. This also makes it far less susceptible to line induced radiated engine noise.

Input Level Control
When low-level inputs are used, this control adjusts the input sensitivity between 200mVrms and 4Vrms. When high-level inputs are used, this control adjusts the input sensitivity between 1Vrms and 22Vrms.

Full on-board protection
On-board circuitry protects the marine A5055 from shorts, high-temperature, overvoltage and undervoltage. An LED indicator is provided to let you know when one of these conditions exists.

Phase Switch
This switch changes the input phase to inverted or non-inverted. This is especially helpful with the subwoofer channel.

RBC wired remote
The RBC wired remote is an easy installation and can be mounted for convenient volume adjustment from driver's seat.

Class AB+D amp technology
The JBL marine A5055 5channels subwoofer amplifier delivers 760-Watts RMS using a Class AB+D amplifier design to ensure high output and minimum current draw.

Turn-on mode
This switch changes DC to REM to adapt with low-level signals or high-level signals, this is especially helpful as part of remote turn-on lead of your installation more choice. A selectable "Turn-on mode" can protect battery to avoid current drain, when you don't expect turn on your amplifier.

Specifications:

• 5 channel marine amplifier
• 50 watts RMS x 4 + 320 watts RMS x 1 at 4 ohms
• 75 watts RMS x 4 + 500 watts RMS x 1 at 2 ohms
• 100 watts RMS x 2 bridged at 4 ohms + 500 watts RMS x 1 at 2 ohms
• variable high- and low-pass filters (32-320 Hz, 12 dB/octave) on front and rear channels
• low-pass filter (32-320 Hz, 12 dB/octave) on subwoofer channel
• bass boost on subwoofer channel (0-12dB at 45Hz)
• phase switch on subwoofer channel (0, 180 degrees)
• preamp and speaker-level inputs
• fuse rating 30A x 3
• 4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
• WxHxD=360mm x 51.3mm x 180mm WxHxD=14-3/16” x 2-1/16" x7-1/8”

What's in The Box?

• One marine A5055 five channel amplifier
• 4 Bare wire-to-RCA adapters
• Six 30A ATO fuses (3 installed, 3 spare)
• Remote bass control module
• 16.5' Remote control cable (RJ-25 plugs on both ends)
• 2 Self-tapping screws for remote (M3 x 15mm)
• 4 Mounting screws (M4 x 53mm)
• Owner's Manual
• Two JBL stickers
• 1 logo badage