OceanAudio OAE-90.4D Car Amplifier User Manual

1. Introduction

Thank you for choosing the OceanAudio OAE-90.4D Compact Full-Range Class D 4 Channel Car Amplifier. This manual provides essential information for the proper installation, operation, and maintenance of your amplifier. Please read this manual thoroughly before attempting installation or operation to ensure optimal performance and safety.

2. Product Overview and Features

The OceanAudio OAE-90.4D is engineered for powerful, efficient, and reliable audio amplification in your vehicle. Its Class D topology ensures high efficiency and a compact footprint, making it suitable for various installations.

Key Features:

Full-range 4 channel amplifier; Class D topology, 4/3/2 Channel Operation.
Max Power @2Ω 4 * 180W RMS Power @2Ω 4 * 90W, @4Ω 4 * 60W, 2 Bridged Channels RMS Power @4Ω 2 * 180W.
PWM MOSFET Power supply; 2Ω stable for 4 Channels; 4Ω stable for Bridged 2 Channels.
RCA and speaker level inputs for versatile connectivity.
Variable High-pass filter 50-500Hz; Variable Low-pass filter 50-500Hz.
Variable input gain control 0.2-8V for precise level matching.
HPF or LPF or Full range mode switch for flexible audio configuration.

Product Views:

OceanAudio OAE-90.4D Car Amplifier, top view.

The OceanAudio OAE-90.4D compact full-range Class D 4-channel car amplifier, showcasing its sleek black design and branding.

OceanAudio OAE-90.4D Car Amplifier, input and output terminals.

Detailed view of the amplifier's input and output connections, including RCA, speaker level inputs, power, ground, remote, and speaker terminals.

OceanAudio OAE-90.4D Car Amplifier with dimensions.

The amplifier shown with its compact dimensions: 1.9 inches (49mm) height, 5.6 inches (143mm) width, and 6.5 inches (165mm) length.

OceanAudio OAE-90.4D Car Amplifier, angled view.

An angled perspective of the OceanAudio OAE-90.4D amplifier, highlighting its compact form factor and connection points.

3. Setup and Installation

Proper installation is crucial for the performance and longevity of your amplifier. It is highly recommended that installation be performed by a qualified professional.

3.1 Safety Precautions:

Disconnect the vehicle's negative battery terminal before starting any electrical work.
Ensure all wiring is properly insulated and secured to prevent short circuits.
Mount the amplifier in a location that allows for adequate ventilation and is protected from moisture and excessive heat.

3.2 Wiring Connections:

Power (BATT+): Connect a fused power cable directly from the positive terminal of the vehicle's battery to the amplifier's BATT+ terminal. Ensure the fuse is located within 18 inches of the battery.
Ground (GND): Connect a short, heavy-gauge cable from the amplifier's GND terminal to a clean, unpainted metal surface on the vehicle's chassis. Ensure a solid electrical connection.
Remote (REM): Connect a remote turn-on wire from your head unit's remote output to the amplifier's REM terminal. This turns the amplifier on and off with your head unit.
Audio Input:
- RCA Input: For head units with RCA pre-outs, connect RCA cables from the head unit to the amplifier's LINE-INPUT (CH1/2, CH3/4) jacks.
- Speaker Level Input: For head units without RCA pre-outs, connect the vehicle's speaker wires directly to the amplifier's HI-INPUT (AUTO-ON) terminals. The amplifier will automatically turn on when it detects an audio signal.
Speaker Output: Connect your speakers to the SPEAKER BRIDGED terminals (CH1/2, CH3/4). Observe correct polarity (+ to + and - to -). For bridged operation, refer to the diagram on the amplifier or the specifications section.

4. Operating the Amplifier

Once installed, the amplifier requires proper adjustment for optimal sound quality and performance.

4.1 Gain Control (LEVEL):

The gain control matches the amplifier's input sensitivity to the output of your head unit. Start with the gain set to minimum (MIN). Play a familiar track at about 75% of your head unit's maximum volume. Slowly increase the amplifier's gain until you hear slight distortion, then back off slightly. This ensures a clean signal without clipping.

4.2 Crossover Settings (X-OVER):

The OAE-90.4D features variable high-pass (HPF) and low-pass (LPF) filters, as well as a full-range mode.

HPF (High-Pass Filter): Allows frequencies above the set point to pass through. Use for full-range speakers to prevent low frequencies from distorting them.
LPF (Low-Pass Filter): Allows frequencies below the set point to pass through. Use for subwoofers to prevent high frequencies from playing.
FULL: Bypasses the crossover, allowing the full frequency range to pass through.

Adjust the crossover points (50-500Hz) according to your speaker's specifications and desired sound profile.

5. Maintenance

The OceanAudio OAE-90.4D amplifier is designed for reliable operation with minimal maintenance. However, periodic checks can help ensure its longevity.

Cleaning: Use a soft, dry cloth to wipe down the amplifier's exterior. Do not use harsh chemicals or abrasive cleaners.
Connections: Periodically check all power, ground, remote, and speaker connections to ensure they are secure and free from corrosion. Loose connections can lead to poor performance or damage.
Ventilation: Ensure that the amplifier's cooling fins are not obstructed by debris or other objects. Proper airflow is essential to prevent overheating.

6. Troubleshooting

If you experience problems with your amplifier, consult the following troubleshooting guide before contacting support.

Problem	Possible Cause	Solution
No Power / Amplifier does not turn on	Blown fuse Loose power or ground connection No remote turn-on signal Protection circuit engaged	Check and replace fuse (use correct rating). Verify all power, ground, and remote connections are secure. Check remote wire connection at head unit and amplifier. Turn off system, check speaker wires for shorts, allow amplifier to cool.
No Sound Output	Gain set too low RCA cables disconnected or faulty Speaker wires disconnected or shorted Head unit not sending signal	Increase gain (LEVEL) setting. Check RCA connections at both ends; try new RCA cables. Inspect speaker wiring for shorts or breaks. Verify head unit is on and playing audio.
Distorted Sound	Gain set too high Improper crossover settings Speaker impedance mismatch Poor ground connection	Reduce gain (LEVEL) setting. Adjust HPF/LPF settings to match speakers. Ensure speaker impedance is compatible with amplifier (2Ω or 4Ω). Verify ground connection is clean and secure.
Amplifier Overheating	Insufficient ventilation Speaker impedance too low Sustained high volume operation	Relocate amplifier or clear obstructions for better airflow. Check speaker impedance; ensure it meets amplifier specifications. Reduce volume or allow amplifier to cool down.

7. Specifications

Below are the detailed technical specifications for the OceanAudio OAE-90.4D amplifier.

OceanAudio OAE-90.4D Amplifier Specifications Table.

A table detailing the technical specifications of the OceanAudio OAE-90.4D amplifier, including power output, input sensitivity, frequency response, and fuse rating.

Feature	Value
Brand	OceanAudio
Model Number	OAE-90.4D
Number of Channels	4
RMS Power @2Ω	4 x 90W
RMS Power @4Ω	4 x 60W
Bridged RMS Power @4Ω	2 x 180W
Max Power @2Ω	4 x 180W
Max Power @4Ω	4 x 120W
THD	0.01%
Input Sensitivity	0.2-8V
S/N Ratio	>102dB
Frequency Response	9Hz - 50KHz
Variable High-Pass Filter	50-500Hz
Variable Low-Pass Filter	50-500Hz
Fuse Rating	35A x 1
Voltage	12 Volts (DC)
Mounting Type	Surface Mount
Package Dimensions	9.76 x 7.95 x 4.53 inches
Item Weight	3.92 Pounds
Overall Dimensions (L x W x H)	6.5" x 5.6" x 1.9" (165mm x 143mm x 49mm)

8. Warranty and Support

OceanAudio provides a 1-Year Limited Warranty for the OAE-90.4D amplifier, covering defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims.

For technical support, warranty service, or general inquiries, please contact OceanAudio customer service through the retailer where the product was purchased or visit the official OceanAudio website for contact information.

Please note that unauthorized modifications or improper installation may void the warranty.