Introduction
The WAudio SUA-350 is a 350W Class-D subwoofer plate amplifier designed for integration into DIY powered-subwoofer projects or as a replacement for existing plate amplifiers. It delivers 350W RMS output into a 4-ohm load, providing robust low-frequency performance. This manual provides essential information for safe installation, operation, and maintenance of your amplifier.
Important Safety Information
Please read and understand all safety instructions before installing or operating the WAudio SUA-350 amplifier.
- Voltage Selection: Before connecting power, ensure the rear voltage selector is set correctly for your region (110V or 230V). Incorrect voltage selection can cause severe damage to the amplifier and connected equipment.
- Ventilation: Install the amplifier in a location that allows for proper ventilation to prevent overheating. Maintain adequate clearance around the unit.
- Grounding: Ensure the amplifier is properly grounded to prevent electrical shock and reduce noise.
- Load Impedance: This amplifier is designed for a 4-ohm subwoofer load. Confirm your subwoofer driver and wiring are compatible.
- Power Cord: A power cord is not included. Use a suitable, grounded power cord for your region.
- Service: Do not attempt to service this unit yourself. Refer all servicing to qualified personnel.
- Water and Moisture: Do not expose the amplifier to water or excessive moisture.
Package Contents
Verify that all items are present upon unpacking:
- WAudio SUA-350 Plate Amplifier
- User Guide (This document)
Note: A power cord is not included and must be supplied separately.
Product Overview
Rear Panel Controls and Connections
The rear panel of the SUA-350 amplifier features all necessary controls and input/output connections for integration into your audio system.
Low-Frequency Setup Controls
- Phase (0-180°): Adjusts the phase of the subwoofer output relative to your main speakers to ensure proper acoustic alignment.
- Crossover (50-180 Hz): Sets the upper frequency limit for the subwoofer, allowing it to blend seamlessly with your main speakers.
- EQ/Gain Modes: Provides options to adjust the equalization and gain for optimal sound. This includes a built-in bass boost at 45Hz (+6dB) for enhanced low-end depth.
Input and Output Connections
- RCA Line Inputs (Right/Left-Mono): For connecting line-level sources from your audio receiver or pre-amplifier. The amplifier sums these inputs to a mono signal for the subwoofer.
- Balanced Input/Output (XLR): Supports balanced connections for compatible audio systems, beneficial for longer signal runs and reduced noise.
Setup and Installation
Proper installation is critical for the performance and longevity of your amplifier. Follow these steps carefully:
- Prepare the Enclosure: Ensure your subwoofer enclosure has a compatible cutout for the SUA-350 plate amplifier. The amplifier dimensions are 205 H x 235 W x 65 D mm (8.07 x 9.25 x 2.56 inches).
- Confirm Subwoofer Driver and Wiring: This amplifier requires a 4-ohm subwoofer load. Verify your subwoofer driver's impedance and ensure wiring is correct and secure.
- Set Voltage Selector: BEFORE CONNECTING POWER, locate the voltage selector switch on the rear panel and set it to either 110V or 230V, matching your local electrical supply. Incorrect voltage selection will damage the unit.
- Mount the Amplifier: Securely mount the SUA-350 into the prepared enclosure. Ensure a tight seal to prevent air leaks.
- Plan for Ventilation: Ensure adequate airflow around the amplifier, especially the heat sink area, to prevent overheating. Do not obstruct ventilation openings.
- Connect Subwoofer Driver: Connect the subwoofer driver to the amplifier's output terminals, observing correct polarity.
- Connect Audio Source: Use RCA cables to connect the line-level outputs from your audio receiver or pre-amplifier to the RCA inputs on the SUA-350. Alternatively, use balanced XLR cables for balanced connections if your source supports it. Do not connect speaker-level output to the line inputs.
- Connect Power: Once all other connections are made and the voltage is correctly set, connect a suitable power cord to the amplifier and then to a grounded electrical outlet.
Operating Instructions
Power Modes
The SUA-350 features a 3-way power switch on the rear panel:
- ON: The amplifier remains continuously powered on. The front LED will indicate operation (blue).
- AUTO: The amplifier will automatically power on when an audio signal is detected and enter standby mode when no signal is present for a period. The front LED indicates operation (blue) or standby (red). This energy-efficient mode consumes less than 0.5W in standby.
- OFF: The amplifier is completely powered off.
Adjusting Audio Controls
After installation, fine-tune the amplifier's settings to match your room acoustics and main speakers:
- Phase: Experiment with the 0-180° phase control to achieve the most coherent bass response with your main speakers.
- Crossover: Adjust the crossover frequency (50-180 Hz) to blend the subwoofer's output smoothly with your main speakers. Start with a setting slightly above your main speakers' low-frequency cutoff.
- EQ/Gain: Use these controls to adjust the overall output level and apply the built-in bass boost at 45Hz (+6dB) if desired for extra low-end impact.
Begin with moderate settings and make fine adjustments after initial setup and listening tests.
Maintenance
Regular maintenance helps ensure the longevity and optimal performance of your amplifier.
- Cleaning: Disconnect power before cleaning. Use a soft, dry cloth to wipe the amplifier's surface. Do not use liquid cleaners or solvents.
- Ventilation: Periodically check that ventilation openings are clear of dust and debris. Ensure nothing obstructs airflow.
- Connections: Ensure all audio and power connections remain secure and free from corrosion.
Troubleshooting
If you encounter issues with your WAudio SUA-350 amplifier, refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power / No indicator light | Power cord not connected; Voltage selector incorrect; Power switch OFF. | Ensure power cord is securely connected. Verify voltage selector is set correctly (110V/230V). Set power switch to ON or AUTO. |
| No sound from subwoofer | No audio signal; Incorrect input connection; Subwoofer wiring incorrect; Amplifier in standby (AUTO mode). | Check audio source output. Ensure RCA/balanced cables are connected correctly. Verify subwoofer driver wiring. Send an audio signal to wake amplifier from standby. |
| Humming or buzzing noise | Ground loop; Loose connections; Interference. | Ensure proper grounding. Check all cable connections. Consider using a ground loop isolator on the subwoofer cable if the hum persists. |
| Distorted sound | Input signal too high; Amplifier overloaded; Incorrect EQ/Gain settings. | Reduce input signal level from source. Check subwoofer impedance (must be 4 ohms). Adjust EQ/Gain settings. |
| Amplifier overheats and shuts down | Insufficient ventilation; Overload. | Ensure adequate ventilation around the unit. Reduce volume or check for short circuits in subwoofer wiring. |
Specifications
Technical specifications for the WAudio SUA-350 Subwoofer Plate Amplifier.
| Feature | Detail |
|---|---|
| Model | SUA-350 |
| Output Power | 350W RMS (into 4 ohms) |
| Load Impedance | 4 Ohms |
| Frequency Response | 25-180 Hz |
| Crossover Frequency | 50-180 Hz (Adjustable) |
| Phase Control | 0-180° (Adjustable) |
| Voltage Selection | 110V / 230V AC (Switchable) |
| Input Connections | RCA (L/R Mono), Balanced (XLR) |
| Output Connections | Balanced (XLR) |
| Power Modes | On, Auto, Off |
| Standby Power Consumption | Less than 0.5W |
| Dimensions (H x W x D) | 205 x 235 x 65 mm (8.07 x 9.25 x 2.56 inches) |
| Item Weight | 1.1 kg (2.42 lbs) |
| Material | Metal |
| Certifications | CE |
| UPC | 889743444971 |
Warranty and Support
For warranty information or technical support, please contact WAudio customer service through your retailer or the official WAudio website. Please have your model number (SUA-350) and purchase date available when contacting support.
Video Resources
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