1. Introduction
Thank you for choosing the KMH Db Drive WDX 800.4 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. Safety Information
Important Safety Precautions:
- Always disconnect the vehicle's battery negative terminal before starting any installation work.
- Ensure all wiring is properly routed and secured to prevent damage or short circuits.
- Use appropriate gauge wiring for power and ground connections as specified in this manual.
- Install the amplifier in a location that allows for adequate ventilation to prevent overheating.
- Avoid mounting the amplifier in areas exposed to moisture or direct sunlight.
- If you are unsure about any part of the installation process, consult a professional car audio installer.
3. Package Contents
Verify that all items are present in the package:
- KMH Db Drive WDX 800.4 4-Channel Car Amplifier
- Mounting Hardware (screws)
- User Manual (this document)
4. Key Features
The KMH Db Drive WDX 800.4 amplifier is designed with the following features:
- 2Ω Stereo Capability: Allows for flexible speaker configurations.
- Blue LED POWER-ON Indicator: Provides visual confirmation of amplifier status.
- Variable Low Level RCA Input: For connecting to various head units.
- Variable 12dB Per Octave Low-Pass Crossover: Enables precise audio frequency control.
- Direct-Connect Speaker Terminals: For secure and efficient speaker wiring.
5. Setup and Installation
Proper installation is crucial for the performance and longevity of your amplifier. Follow these steps carefully.
5.1 Mounting Location
Choose a mounting location that is dry, well-ventilated, and secure. Common locations include under a seat, in the trunk, or behind a panel. Ensure the amplifier is not exposed to direct sunlight or excessive heat.
5.2 Wiring Connections
Refer to the diagram below for proper wiring connections. Use high-quality cables for optimal performance and safety.
Image 1: Rear view of the KMH Db Drive WDX 800.4 amplifier, illustrating the power input (GND, REM, +12V) and speaker output terminals (CH 1, CH 2, CH 3, CH 4).
- Power (+12V): Connect a fused power cable directly from the positive terminal of the vehicle's battery. The fuse should be located within 18 inches of the battery.
- Ground (GND): Connect a short, heavy-gauge cable from the amplifier's ground terminal to a clean, unpainted metal surface on the vehicle's chassis.
- Remote (REM): Connect a remote turn-on wire from your head unit's remote output to this terminal. This wire turns the amplifier on and off with your head unit.
- RCA Inputs: Connect RCA cables from your head unit's pre-amp outputs to the amplifier's RCA input jacks.
- Speaker Outputs: Connect your speakers to the amplifier's speaker terminals. Ensure correct polarity (+ to + and - to -). This amplifier supports 2Ω stereo capability.
Image 2: Side view of the KMH Db Drive WDX 800.4 amplifier, displaying the control panel with GAIN, LPF, HPF, X-OVER, and BASS BOOST adjustments for channels 1/2 and 3/4.
6. Operating Instructions
Once the amplifier is installed, you can adjust its settings for optimal audio performance.
6.1 Initial Power-Up
After all connections are made and verified, reconnect the vehicle's battery. Turn on your head unit. The blue LED POWER-ON indicator on the amplifier should illuminate, indicating it is receiving power.
6.2 Adjusting Controls
- GAIN Control: This matches the amplifier's input sensitivity to the output of your head unit. Start with the gain set to minimum. Play a familiar track at about 75% of your head unit's maximum volume. Slowly increase the amplifier's gain until you hear distortion, then back off slightly.
- X-OVER (Crossover) Switch: Select between LPF (Low Pass Filter), HPF (High Pass Filter), or FULL (Full Range).
- LPF: Allows only frequencies below the set point to pass, typically used for subwoofers.
- HPF: Allows only frequencies above the set point to pass, typically used for full-range speakers or tweeters.
- FULL: Allows all frequencies to pass, suitable for full-range speakers without a separate subwoofer.
- LPF/HPF Frequency Adjustment: Use the corresponding knob to set the desired crossover frequency. This allows you to tailor the sound to your specific speaker setup.
- BASS BOOST: This control allows you to increase the bass output at a specific frequency. Use sparingly to avoid distortion and speaker damage.
7. Maintenance
To ensure long-term performance of your amplifier, follow these simple maintenance guidelines:
- Cleaning: Periodically wipe the amplifier's exterior with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Ventilation: Ensure that the amplifier's cooling fins are free from dust and debris to maintain proper airflow.
- Connections: Occasionally check all wiring connections to ensure they are secure and free from corrosion.
8. Troubleshooting
If you experience issues with your amplifier, consult the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Amplifier does not turn on (No blue LED) | No power, blown fuse, faulty ground, remote wire issue. | Check battery connections, inline fuse, ground connection, and remote turn-on wire from head unit. |
| No sound output | RCA cables disconnected, speaker wires disconnected, gain too low, head unit not sending signal. | Verify RCA and speaker connections, adjust gain, check head unit output. |
| Distorted sound | Gain set too high, improper crossover settings, poor ground connection, damaged speakers. | Reduce gain, adjust crossover settings, check ground, inspect speakers. |
| Amplifier overheats (Protection mode) | Insufficient ventilation, impedance too low, prolonged high volume. | Ensure proper ventilation, check speaker impedance, reduce volume. |
9. Technical Specifications
- Brand: KMH
- Manufacturer: DB Drive
- Model Number: WDX 800.4
- Number of Channels: 4
- Item Dimensions (L x W x H): 38.1 x 18 x 5.6 Centimeters (15 x 7.08 x 2.22 Inches)
- Item Weight: 3.38 kg (3 kg 380 g)
- Material: Metals, Semiconductors
- Mounting Type: Surface Mount
- Features: 2Ω Stereo Capability, Variable Low Level RCA Input, Variable 12dB Per Octave Low-Pass X-Over, Direct-Connect Speaker Terminals
10. Warranty and Customer Support
For warranty information or technical assistance, please refer to the warranty card included with your product or contact KMH customer support. Keep your purchase receipt as proof of purchase.
Customer Support: Please visit the official KMH website or contact your local dealer for support.
