JBL A5055 Amplifiers Marine Owner’s Manual

JBL A5055 Amplifiers Marine

WHAT’S IN THE BOX

Marine A754

Marine A5055

ACCESSING CONNECTORS AND CONTROL PANEL

Pry off trim piece

Slide the panel cover down

Remove panel cover

MOUNTING THE AMP

Note: It is recommended that you make all wire connections before permanently mounting the amp.

IMPORTANT: Disconnect the negative (–) battery terminal of the accessory battery before beginning the installation.

• Always wear protective eyewear when using tools.
• Choose a safe mounting location. Check clearances on both sides of a planned mounting surface. Be sure that screws or wires will not puncture the vessel hull, fuel lines, or wiring harnesses, and that wire routing will not interfere with the safe boat operation.
• Use caution when drilling or cutting in the mounting area.
• Choose a location that provides enough air circulation.
• Do not mount the amplifier with the heat sink facing downward, as this interferes with cooling.
• Mount the amplifier so that it will not be damaged by the feet of passengers or shifting cargo.

WIRING FOR POWER AND GROUND

At amplifier

At ground location:

WIRING FOR INPUT SIGNAL

Marine A754 low-level signals

Note: when using low-level signals and remote turn-on lead, set the ” TURN-ON MODE ” switch to “REM ” and the ” INPUT LEVEL switch to “LO”.

Marine A5055 low-level signals

Note: when using low-level signals and remote turn-on lead with the Marine A5055, set the “TURN-ON MODE” switch to “REM”, the SUB “INPUT” switch to “EXT”, and the “INPUT LEVEL” switch to “LO”.

Marine A754 high-level signals

Note: when using low-level signals and remote turn-on lead with the Marine A5055, set the “TURN-ON MODE” switch to “REM”, the SUB “INPUT” switch to “EXT”, and the “INPUT LEVEL” switch to “LO”.

Marine A754 high-level signals

Note: when using high-level signals, set the “TURN-ON MODE” switch to “DC” and the “INPUT LEVEL” switch to “HIl”. If no sound plays, change the “INPUT LEVEL” switch to “HI2”.

Marine A5055 high-level input signals

Note: when using high-level signals with the Marine A5055, set the “TURN- ON MODE” switch to “DC”, the SUB “INPUT” switch to “INT” “, and the “INPUT LEVEL” switch to “HIl”. If no sound plays, change the “Input Level” switch to “HI2”

WIRING FOR OUTPUT

Marine A754 4-channel output (4ohm/2ohm)

Marine A754 3-channel output (Front: 4ohm/2ohm; Rear: 4ohm)

Marine A754 2-channel output (4ohm)

Marine A5055 5-channel output (4ohm/2ohm)

CONNECTING THE REMOTE BASS CONTROLLER (MARINE A5055 ONLY)

SETTING GAIN, CROSSOVERS, AND BASS BOOST

Setting the gain

1. Start with GAIN control set to minimum, and the crossover control rotated midway.
2. For the front and rear channels, choose music you’re familiar with. For the subwoofer channel on the Marine A5055, choose music with substantial bass content.
3. Turn the volume control on your receiver to ¾ of its total output.
4. Adjust the GAIN control clockwise, listening carefully to the bass output. If you hear distortion, turn the GAIN control counterclockwise to decrease the gain.

Selecting the crossover mode
On the front and rear channels, you can select your preferred crossover mode.

• Choose HPF to allow only frequencies above a certain point to reach your speakers. Recommended if you’re using a subwoofer in your system, as it keeps a low base from your full-range speakers.
• Choose LPF to allow only frequencies below a certain point to reach your speakers. Recommended if you’re bridging the front or rear channels to power a subwoofer.
• Choose FULL to allow all frequencies to reach your speakers. Recommended if you’re not using a subwoofer in your system.

Note: The crossover mode for the subwoofer channel of the Marine A5055 is low-pass only.

Selecting the crossover frequency
Choose the crossover point to suit listening preferences. Turn the dials to the left to lower the crossover point and to the right to raise the crossover point. Exact crossover settings for coaxial speakers and subwoofers depend on your listening preferences.

Selecting the subwoofer phase (Marine A5055 only)

Switch the PHASE back and forth to determine which setting provides the most clean bass output.

Selecting the bass boost (Marine A5055 only)
Adjust the BASS-BOOST control clockwise or counterclockwise to suit your taste.

SPECIFICATIONS

| Marine A754| Marine A5055
---|---|---
Power output @ 4 ohms (14.4V)| 75 watts RMS x 4| 50 watts RMS x 4,

320 watts x 1

Power output @ 4 ohms (12V)| 55 watts RMS x 4| 40 watts RMS x 4,

255 watts x 1

Power output @ 2 ohms (14.4V)| 100 watts RMS x 4| 75 watts RMS x 4,

500 watts x 1

Power output @ 2 ohms (12V)| 80 watts RMS x 4| 65 watts RMS x 4,

390 watts x 1

Power output in bridged mode (14.4V)| 200 watts RMS x 2 at 4 ohms| 150 watts RMS x 2 at 4 ohms
Power output in bridged mode (12V)| 160 watts RMS x 2 at 4 ohms| 130 watts RMS x 2 at 4 ohms
Frequency response| 10-40 KHz| 10-40 KHz/

25-320 Hz

Crossover frequencies

|

32-320 Hz variable,

12 dB/octave

| 32-320 Hz variable high- and low-pass (front and rear);

32-320 Hz low- pass (subwoofer); 12 dB/octave

Line-level input sensitivity| 200 mVrms –

4 Vrms

| 200 mVrms –

4 Vrms

High-level input sensitivity| 1 – 22 Vrms| 1 – 22 Vrms
Signal-to-noise ratio| >80 dB| >80 dB
THD+N @ rated power| <1%| <1%
Fuse rating| 30 A x 2| 30 A x 3
Dimensions (W x H x D)| 12-5/8″ x 2-1/16″ x

7-1/8″ (320mm x 51.3mm x 180mm)

| 14-3/16″ x 2-1/16″ x

7-1/8″ (360mm x 51.3mm x 180mm)

Weight| 3.08 kg| 3.98 kg
Recommended wire gauge| 8| 4
Maximum operation temperature| 45°C| 45°C

TROUBLESHOOTING

No audio and the POWER INDICATOR is off.

• No voltage at BATT+ and/or REM terminals, or bad or no ground connection. Check voltages at amplifier terminals with VOM.

No audio and PROTECT INDICATOR flashes every 4 seconds.

• DC voltage on amplifier output. The amplifier may need service; see the enclosed warranty card for service information.

No audio and PROTECT and POWER INDICATORS flash.

• Voltage less than 9V on BATT+ connection. Check the boat charging system.

No audio and the PROTECT INDICATOR is on.

• The amplifier is overheated. Make sure amplifier cooling is not blocked at the mounting location. Or, there may be a voltage greater than 16V (or less than 8.5V) on a BATT+ connection. Check the boat charging system.

The amplifier fuse keeps blowing.

• The wiring is connected incorrectly or there is a short circuit. Check wiring connections.

Distorted audio.

• The gain is not set properly. Check setting. Check wires for shorts or grounds. The amplifier or source unit may be defective.

Distorted audio and PROTECT INDICATOR flashes.

• Short circuit in speaker or wire. Remove speaker leads one at a time to locate a shorted speaker or wire, and repair it.

Music lacks dynamics or “punch”.

• Speakers are not connected properly. Check speaker connections for proper polarity.

Engine noise—whining or clicking—in the system when the engine is on.

• The amplifier is picking up alternator noise. First, check the ground connection on the amplifier – loose or improper ground is one of the main causes for noise. Turn down gain. Move RCA audio cables away from power wires. Installing an alternator noise filter on power line between the battery and alternator might also be necessary.

HARMAN International Industries, Incorporated 8500 Balboa Boulevard, Northridge, CA 91329 USA www.jbl.com

2023 HARMAN International Industries, Incorporated. All rights reserved. JBL is a trademark of HARMAN International Industries, Incorporated, registered in the United States and/or other countries. Features, specifications and appearance are subject to change without notice.

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