1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Hertz HDP4 4-Channel 1000W Max D-Class Amplifier. Please read this manual thoroughly before attempting installation or operation to ensure proper function and safety.
Figure 1.1: Top-down angled view of the Hertz HDP4 amplifier, showcasing its compact black casing and control panel on the top surface. The Hertz logo is visible on the main body.
2. Safety Information
Always observe the following safety precautions:
- Disconnect the vehicle's battery before any installation or wiring.
- Ensure all wiring is properly insulated to prevent short circuits.
- Mount the amplifier securely in a well-ventilated area, away from moisture and direct heat.
- Use appropriate gauge wiring for power and ground connections as specified in the installation section.
- Consult a professional installer if you are unsure about any part of the installation process.
3. Package Contents
Verify that all items are present in the package:
- Hertz HDP4 Amplifier Unit
- Mounting Hardware (screws, brackets)
- User Manual (this document)
4. Setup and Installation
4.1 Mounting the Amplifier
Choose a suitable location for mounting the amplifier. It should be a dry, well-ventilated area, protected from direct sunlight and excessive vibration. Ensure there is sufficient space around the amplifier for air circulation.
Figure 4.1: Top view of the Hertz HDP4 amplifier, illustrating its compact design and potential mounting points. The amplifier features a textured black finish with the Hertz logo prominently displayed.
- Place the amplifier in the desired mounting location and mark the screw holes.
- Drill pilot holes if necessary, ensuring not to damage any vehicle components.
- Secure the amplifier using the provided mounting screws.
4.2 Wiring Connections
Proper wiring is critical for performance and safety. Refer to the diagram below for power, ground, remote, and speaker connections.
Figure 4.2: Rear panel of the Hertz HDP4 amplifier, detailing the power input (BATT), ground (GND), remote turn-on (REM) terminals, and speaker output terminals (L/R mono for channels A and B). Two 40A fuses are also visible.
- Power (BATT): Connect a fused power cable (minimum 8 AWG recommended) directly from the vehicle's positive battery terminal to the BATT terminal on the amplifier.
- Ground (GND): Connect a ground cable of the same gauge as the power cable from the GND terminal to a clean, unpainted metal point on the vehicle chassis.
- Remote (REM): Connect a remote turn-on wire from your head unit's remote output to the REM terminal.
- Speaker Outputs: Connect your speakers to the appropriate L (left) and R (right) terminals for each channel (A and B). Ensure correct polarity. The amplifier supports mono bridging for increased power output to a single speaker or subwoofer.
- Fuses: The amplifier is equipped with two 40A fuses. Replace only with fuses of the same type and rating.
4.3 Input Connections and Controls
The amplifier offers both RCA (low-level) and High-Level inputs, along with various crossover and gain controls.
Figure 4.3: Input and control panel of the Hertz HDP4 amplifier. This panel includes RCA pre-inputs (A PRE-IN, B PRE-IN), high-level inputs (A HI-IN, B HI-IN), and various adjustment knobs for levels, pass mode, and crossover settings. A switch for HI-IN AUTO TURN-ON is also present.
- RCA Pre-Inputs (A PRE-IN, B PRE-IN): Connect your head unit's RCA outputs to these inputs for low-level signal.
- High-Level Inputs (A HI-IN, B HI-IN): If your head unit does not have RCA outputs, connect speaker-level signals directly to these inputs. The amplifier features an auto turn-on function for high-level inputs.
- Levels: Adjust the input sensitivity (gain) to match the output of your head unit. Start with the gain at minimum and slowly increase until desired volume is achieved without distortion.
- Pass Mode: Select the desired crossover mode (e.g., Full, HPF, LPF) for each channel pair.
- Crossover Frequency (XOVER): Adjust the frequency point for the selected crossover mode.
- Multiplier: Use this switch to multiply the crossover frequency setting by 1 or 10, depending on your system requirements.
5. Operating Instructions
5.1 Initial Power-Up
- After all connections are made and verified, reconnect the vehicle's battery.
- Turn on your head unit. The amplifier should power on automatically (if remote wire is connected or HI-IN AUTO TURN-ON is active).
- Start with the head unit volume low and gradually increase it, listening for clear audio.
5.2 Adjusting Audio Settings
Fine-tune the amplifier's settings for optimal sound quality:
- Gain Matching: Adjust the amplifier's gain controls (LEVELS) to match the output voltage of your head unit. This is crucial to prevent distortion.
- Crossover Settings: Set the crossover frequencies (XOVER) and pass modes (PASS MODE) according to the specifications of your speakers. For full-range speakers, a high-pass filter (HPF) is often used to protect them from low bass frequencies. For subwoofers, a low-pass filter (LPF) is used.
6. Maintenance
To ensure the longevity and optimal performance of your Hertz HDP4 amplifier, follow these maintenance guidelines:
- Cleaning: Periodically clean the amplifier's exterior with a soft, dry cloth. Do not use harsh chemicals or abrasive cleaners.
- Ventilation: Ensure that the amplifier's cooling fins are free from dust and obstructions to maintain proper heat dissipation.
- Connections: Regularly check all wiring connections for tightness and corrosion. Loose connections can lead to poor performance or damage.
- Fuses: If a fuse blows, replace it only with a fuse of the exact same type and rating (2 x 40A). Using an incorrect fuse can cause severe damage to the amplifier or vehicle electrical system.
Figure 6.1: Bottom panel of the Hertz HDP4 amplifier, displaying the serial number label and important caution notes regarding insulated screws. This area should be kept clean and free from obstructions.
7. Troubleshooting
If you experience issues with your amplifier, consult the following table before contacting support:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Amplifier does not turn on | Blown fuse, loose power/ground/remote wire, faulty head unit remote output. | Check and replace fuses. Verify all power, ground, and remote connections are secure. Test remote wire for 12V signal. |
| No Sound | Loose RCA/speaker wires, incorrect input selection, amplifier in protection mode, faulty speakers. | Check all signal and speaker connections. Ensure correct input mode is selected. Check for protection light. Test speakers. |
| Distorted Sound | Gain set too high, incorrect crossover settings, poor quality audio source, damaged speakers. | Reduce gain. Adjust crossover settings. Test with a different audio source. Inspect speakers for damage. |
| Amplifier Overheats | Insufficient ventilation, impedance mismatch, prolonged high-power operation. | Ensure proper airflow around the amplifier. Verify speaker impedance matches amplifier's capabilities. Reduce volume or operating time. |
8. Specifications
Technical specifications for the Hertz HDP4 4-Channel 1000W Max D-Class Amplifier:
- Model: HDP4
- Brand: HERTZ
- Type: 4-Channel D-Class Amplifier
- Max Power: 1000W (as per product title, specific RMS not provided in data)
- Product Dimensions (L x W x H): 11.18 x 6.73 x 1.83 inches
- Weight: 6.35 Pounds
- Voltage: 14.4 Volts (Operating)
- Mounting Type: Surface Mount
- Fuses: 2 x 40A
- ASIN: B00AWBU1FQ
9. Warranty Information
Hertz products are designed and manufactured to the highest quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Hertz website. Keep your purchase receipt as proof of purchase for warranty claims.
10. Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact Hertz customer support through their official website or authorized dealer. Ensure you have your product model (HDP4) and serial number ready when contacting support.
Official Hertz Website: www.hertzaudiovideo.com
