1. Product Overview
The Belva BXA6404 is a 640W Peak BX-Series Class-A/B 4-Channel Car Audio MOSFET Amplifier designed to enhance your vehicle's audio system. It features a stable 2-ohm operation, advanced protection circuitry, and versatile sound control options for optimal performance.
Key Features:
- High Power Output: Delivers 640 watts peak power (160W x 4 at 2 ohms, 320W x 2 at 4 ohms bridged).
- Class A/B Design: Ensures high audio quality with minimal distortion.
- 2-Ohm Stable: Provides reliable performance with lower impedance loads.
- Advanced Protection: Includes thermal, overload, and speaker short protection.
- Versatile Sound Control: Features variable high-pass (80 - 1,200 Hz) and low-pass (50 - 250 Hz) filters, plus bass boost (0 - 18 dB).
- Easy Installation: Equipped with speaker-level (high-level) inputs and a 50A fuse.
- Compact Design: Dimensions of 7.48" W x 11.02" L x 2.00" H for flexible placement.
- Premium Build: Utilizes Pulse Width Modulated (PWM) MOSFET power supply and LED indicators.
2. Installation and Setup
Proper installation is crucial for optimal performance and safety. It is recommended to have this amplifier installed by a professional car audio technician.
2.1 Connection Terminals Overview
Image: Overview of the amplifier's connection terminals and control panel. This image highlights the speaker outputs, power inputs, fuses, RCA inputs, filter and input controls, and high-level inputs.
2.2 Power and Speaker Connections
Ensure the vehicle's battery is disconnected before making any power connections. Use appropriate gauge wiring for power, ground, and remote turn-on connections as specified in the full manual.
Image: Close-up view of the power input (GND, REM, +12V) and speaker output (CH1, CH2, CH3, CH4) terminals, along with the fuse slots.
- GND (Ground): Connect to a clean, unpainted metal surface of the vehicle chassis.
- REM (Remote Turn-On): Connect to the remote output of your head unit.
- +12V (Power): Connect directly to the positive terminal of the vehicle's battery via an inline fuse (50A recommended).
- Fuses: The amplifier uses two fuses for protection. Replace with the same type and rating (25A each).
- Speaker Output (CH1-CH4): Connect your speakers to these terminals. Observe correct polarity and impedance. The amplifier is 2-ohm stable.
2.3 Audio Input Connections
The BXA6404 supports both RCA (low-level) and high-level inputs.
Image: Close-up view of the amplifier's control panel, showing RCA inputs (CH1/CH2, CH3/CH4) and high-level inputs (HI INPUT 1+2, HI INPUT 3+4).
- RCA Input: Connect RCA cables from your head unit's pre-amp outputs to the amplifier's RCA inputs (CH1/CH2 and CH3/CH4).
- High-Level Input: If your head unit does not have RCA outputs, use the provided high-level input connectors. Connect speaker wires from your head unit's speaker outputs to these inputs.
- Input Mode Switch: Select between 2CH and 4CH input modes depending on your source configuration.
3. Operation and Adjustments
The BXA6404 offers various controls to fine-tune your audio output.
Image: Close-up view of the amplifier's control panel, detailing the Gain, Bass EQ, LPF, HPF, and Mode switches for channels 1/2 and 3/4.
- Gain Control: Adjusts the input sensitivity to match the output of your head unit. Start at minimum and slowly increase until desired volume is achieved without distortion.
- HPF (High-Pass Filter): Variable from 60Hz to 1.2kHz. Filters out low frequencies, typically used for full-range speakers to prevent distortion from bass.
- LPF (Low-Pass Filter): Variable from 50Hz to 250Hz. Filters out high frequencies, typically used for subwoofers.
- Mode Switch (HPF/FULL): Selects between High-Pass Filter or Full-Range output for channels 1/2.
- Mode Switch (LPF/FULL/HPF): Selects between Low-Pass Filter, Full-Range, or High-Pass Filter output for channels 3/4. This allows for flexible configuration, including bridging for a subwoofer.
- Bass EQ (Bass Boost): Variable from 0dB to 18dB. Increases bass output at 45Hz. Use sparingly to avoid distortion.
3.1 Official Product Video
Video: An overview of the Belva BX-Series amplifiers, including details on their features and controls. This video provides visual guidance on the various settings and input/output options available on the amplifier.
4. Maintenance
To ensure the longevity and optimal performance of your Belva BXA6404 amplifier, follow these maintenance guidelines:
- Regular Cleaning: Periodically clean the amplifier's exterior with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Ventilation: Ensure the amplifier's heat sink fins are free from dust and debris to maintain proper cooling. Do not obstruct airflow around the amplifier.
- Connection Checks: Annually inspect all power, ground, remote, and speaker connections for tightness and corrosion. Loose connections can lead to poor performance or damage.
- Fuse Replacement: If a fuse blows, replace it only with a fuse of the exact same type and rating (25A). Using an incorrect fuse can cause severe damage to the amplifier or vehicle's electrical system.
- Environmental Protection: Keep the amplifier away from excessive moisture, direct sunlight, and extreme temperatures.
5. Troubleshooting
If you experience issues with your amplifier, refer to the following common problems and solutions before contacting technical support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / No Sound | Blown fuse, loose power/ground/remote wire, amplifier in protect mode. | Check and replace fuses. Verify all power, ground, and remote connections are secure. If in protect mode, check speaker wiring for shorts and ensure proper impedance. |
| Distorted Sound | Gain set too high, improper filter settings, poor input signal, speaker impedance mismatch. | Reduce gain setting. Adjust HPF/LPF settings. Check RCA or high-level input connections. Verify speaker impedance is within amplifier's specifications (2-ohm stable). |
| Amplifier Overheating | Insufficient ventilation, impedance too low, prolonged high-volume operation. | Ensure adequate airflow around the amplifier. Check speaker impedance. Reduce volume or allow amplifier to cool down. Consider a different mounting location if heat is persistent. |
| Noise (Hissing, Whining) | Ground loop, poor quality RCA cables, power wire too close to signal cables. | Ensure a solid ground connection. Use high-quality, shielded RCA cables. Route power and signal cables separately. |
6. Specifications
| Feature | Detail |
|---|---|
| Model | BXA6404 |
| Brand | BELVA |
| Number of Channels | 4 |
| Amplifier Class | Class A/B |
| Peak Power Output | 640 Watts |
| RMS Power (2 Ohms) | 160W x 4 |
| RMS Power (Bridged 4 Ohms) | 320W x 2 |
| Minimum Stable Impedance | 2 Ohms |
| High-Pass Filter (HPF) | Variable 80 - 1,200 Hz |
| Low-Pass Filter (LPF) | Variable 50 - 250 Hz |
| Bass Boost | Variable 0 - 18 dB at 45Hz |
| Input Type | High-level and Low-level (RCA) |
| Fuse Rating | 2 x 25A (50A total) |
| Dimensions (W x L x H) | 7.48" x 11.02" x 2.00" |
| Material Type | Semiconductor Materials |
| GTIN / UPC | 810021843414 |
7. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official BELVA website or contact their customer service department. Keep your purchase receipt as proof of purchase for any warranty claims.
Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.