1. Introduction and Overview
The Hertz HDP5 is a high-performance 5-channel Class D car audio amplifier designed for complex audio installations. It delivers up to 950W total power, featuring flexible integrated crossovers and versatile input options for compatibility with both OEM and aftermarket sources. Its robust design includes a dual power supply and efficient heat dissipation for reliable operation, ensuring exceptional acoustic results in various vehicle audio setups.
2. Safety Information
Please read and understand all safety instructions before installing or operating the Hertz HDP5 amplifier. Failure to follow these guidelines may result in injury, damage to the amplifier, or damage to your vehicle's electrical system.
- Always disconnect the vehicle's negative battery terminal before performing any electrical work.
- Ensure proper grounding of the amplifier to the vehicle chassis.
- Avoid mounting the amplifier in areas exposed to water, excessive moisture, or direct sunlight.
- Do not obstruct the cooling fins or ventilation openings of the amplifier.
- Use appropriate gauge wiring for power, ground, and speaker connections as specified in the installation section.
- Professional installation is highly recommended to ensure correct wiring and optimal performance.
3. Package Contents
Verify that all items are present in the package:
- Hertz HDP5 Amplifier (1 unit)
- Mounting hardware (screws, washers)
- User Manual (this document)
4. Product Features
The Hertz HDP5 amplifier incorporates advanced features for superior car audio performance:
- 5-Channel Class D Amplification: Efficient power delivery for a full range of speakers and a subwoofer.
- Total Power Output: Capable of delivering up to 950W total power.
- Flexible Integrated Crossovers: Configurable as full range, hi-pass (12dB/oct), band-pass, and lo-pass (24dB/oct) for precise sound tuning.
- HD IN System: Versatile input options including Speaker In and RCA inputs for compatibility with both OEM and aftermarket head units.
- Dual Power Supply: Ensures stable and consistent power flow for optimal performance.
- Dual Extrusion Heat Dissipator: Advanced thermal management for reliable, long-term operation.
- Illuminated Hertz Logo: A rotatable, illuminated logo for aesthetic integration into various installations.
5. Installation and Setup
Proper installation is crucial for the performance and longevity of your Hertz HDP5 amplifier. Follow these steps carefully.
5.1 Mounting the Amplifier
Mount the amplifier securely in a dry, well-ventilated area, away from direct sunlight and heat sources. Ensure adequate airflow around the unit for proper cooling. The amplifier can be mounted horizontally or vertically, depending on space and cooling requirements. Avoid mounting it directly on carpet or in enclosed spaces without ventilation.
Figure 1: Top view of the Hertz HDP5 amplifier, showing its compact design and control panel.
5.2 Wiring Connections
All wiring should be performed with the vehicle's battery disconnected. Use high-quality cables and connectors for optimal performance and safety.
5.2.1 Power and Ground Connections
- Power (+BATT): Connect a main power cable (minimum 4 AWG recommended) from the amplifier's +BATT terminal to the vehicle's positive battery terminal. An appropriate fuse holder with an 80A fuse (not included) must be installed within 18 inches (45 cm) of the battery.
- Ground (GND): Connect a ground cable of the same gauge as the power cable from the amplifier's GND terminal to a clean, solid, unpainted metal point on the vehicle chassis. Ensure a good electrical connection.
- Remote Turn-On (REM): Connect the REM terminal to the remote output of your head unit. This signal turns the amplifier on and off with your head unit.
5.2.2 Input Connections
The HDP5 offers both RCA (low-level) and High-Level inputs for compatibility with various head units.
Figure 2: Input panel of the Hertz HDP5 amplifier, showing RCA and high-level input terminals.
- RCA Inputs (PRE-IN A, PRE-IN B, SUB PRE-IN): Use high-quality RCA cables to connect the corresponding pre-out channels from your head unit to the amplifier's RCA inputs.
- High-Level Inputs (HI-IN A, HI-IN B, SUB HI-IN): For head units without RCA outputs, connect the speaker wires directly from your head unit to these terminals. The amplifier features an auto turn-on function when using high-level inputs, which can be enabled via the 'HI-IN AUTO TURN-ON ON/OFF' switch.
- Input Mode Switch: Select the appropriate input mode (A, B, A+B SUB) based on your head unit's output configuration.
5.2.3 Speaker Connections
Connect your speakers to the amplifier's output terminals. Ensure correct polarity (+ to + and - to -) for all speakers.
Figure 3: Output and power connection panel of the Hertz HDP5 amplifier, detailing speaker terminals and fuse location.
- Channels A & B: Connect your front and rear speakers to the L and R terminals for Channels A and B.
- Subwoofer (SUB): Connect your subwoofer to the L and R terminals for the SUB channel. The amplifier is designed to power a single subwoofer or multiple subwoofers wired to present an appropriate impedance.
6. Operating Instructions
Once installed, the Hertz HDP5 amplifier requires proper adjustment of its controls to achieve optimal sound quality.
6.1 Controls and Adjustments
- Level Control (Gain): Adjusts the input sensitivity to match the output voltage of your head unit. Start with the gain at minimum and slowly increase it until the desired volume is achieved without distortion.
- Crossover Controls (HI-PASS, LO-PASS, BAND-PASS): These filters allow you to define the frequency range that each channel reproduces.
- HI-PASS: Filters out frequencies below the set point, protecting smaller speakers from damaging low bass.
- LO-PASS: Filters out frequencies above the set point, typically used for subwoofers to reproduce only bass frequencies.
- BAND-PASS: Allows a specific range of frequencies to pass, useful for mid-range speakers.
- Subsonic Filter: Filters out extremely low, inaudible frequencies below the set point, protecting subwoofers from over-excursion and improving efficiency.
- Phase Control (SUB): Adjusts the phase of the subwoofer output (0° or 180°) to optimize bass integration with your front speakers and prevent cancellation.
- Bass Boost (SUB): Provides an adjustable low-frequency enhancement at a specific frequency, typically around 45-50 Hz. Use sparingly to avoid distortion.
- Turn-On Mode Switch: Selects between remote turn-on (REM) and auto turn-on (for high-level inputs).
7. Maintenance
To ensure the longevity and optimal performance of your Hertz HDP5 amplifier, follow these maintenance guidelines:
- Regularly inspect all wiring connections for tightness and corrosion. Loose connections can cause power loss or overheating.
- Keep the amplifier clean and free of dust and debris. Use a soft, dry cloth for cleaning. Do not use harsh chemicals or abrasive cleaners.
- Ensure that the cooling fins and ventilation openings are not obstructed. Proper airflow is essential for heat dissipation.
- Periodically check the fuse for any signs of damage or blowing. Replace with a fuse of the correct rating if necessary.
8. Troubleshooting
If you experience issues with your Hertz HDP5 amplifier, refer to the following troubleshooting guide before contacting support.
8.1 No Power / Amplifier Not Turning On
- Check Power Connection: Verify that the +BATT cable is securely connected to the battery and the amplifier.
- Check Ground Connection: Ensure the GND cable has a solid, clean connection to the vehicle chassis.
- Check Remote Turn-On: Confirm the REM wire is connected to the head unit's remote output and that the head unit is on. If using high-level inputs, ensure the 'HI-IN AUTO TURN-ON' switch is in the 'ON' position.
- Check Fuse: Inspect the external fuse near the battery and the fuses on the amplifier itself (2 x 40A). Replace any blown fuses with the correct rating.
8.2 No Sound Output
- Check Input Connections: Verify that RCA or high-level input cables are securely connected to both the head unit and the amplifier.
- Check Speaker Connections: Ensure all speaker wires are correctly connected to the amplifier and speakers, observing proper polarity.
- Head Unit Output: Confirm the head unit is powered on and outputting an audio signal.
- Crossover Settings: Check crossover settings. If a high-pass filter is set too high, or a low-pass filter is set too low, it might filter out all audible frequencies.
- Gain/Level Settings: Ensure the amplifier's gain control is not set to minimum.
8.3 Distorted Sound
- Adjust Gain/Level: The gain may be set too high, causing clipping. Reduce the gain until distortion disappears.
- Crossover Configuration: Incorrect crossover settings can cause distortion. Adjust filters to suit your speakers.
- Speaker Impedance: Ensure the speaker impedance matches the amplifier's capabilities. Running too low an impedance can cause distortion and overheating.
- Speaker Wiring: Inspect speaker wiring for any shorts or frayed wires touching the chassis.
8.4 Amplifier Overheating
- Ventilation: Ensure the amplifier has adequate ventilation and its cooling fins are not obstructed.
- Impedance Load: Check the impedance of your speakers. Running the amplifier below its recommended minimum impedance can cause overheating.
- Gain Setting: Excessive gain can cause the amplifier to work harder and generate more heat. Reduce the gain if necessary.
- Power Supply: Ensure the power and ground wires are of sufficient gauge and connections are secure.
9. Specifications
Detailed technical specifications for the Hertz HDP5 5-Channel Class D Amplifier:
- Model: HDP5
- Amplifier Class: D
- Channels: 5 (4 x Full Range + 1 x Subwoofer)
- Output Power (RMS): 4 x 70W + 1 x 380W (at 4 Ohms)
- Total Power Output: Up to 950W
- Supply Voltage: 11-15 VDC
- Consumption at Maximum Sound Power: 50 Amp
- Signal-to-Noise Ratio (Channels A/B): 100dB
- Signal-to-Noise Ratio (Subwoofer Channel): 106dB
- Dimensions (L x W x H): 344 mm x 171 mm x 46.7 mm (13.54 x 6.73 x 1.84 inches)
- Weight: 3.1 kg (6.83 lbs)
- Crossover Types: Full Range, Hi-Pass (12dB/oct), Lo-Pass (24dB/oct), Band-Pass
- Input Sensitivity: Adjustable
- Input Type: RCA (Low-Level) and High-Level (Speaker In)
- Connectivity Technology: RCA
- Audio Output Mode: Surround
- Recommended Use: For Car Audio Systems
10. Warranty and Support
For specific warranty terms and conditions, please refer to the warranty card included with your Hertz HDP5 amplifier. Warranty coverage typically varies by region and retailer.
For technical support, service, or further assistance, please contact your authorized Hertz dealer or visit the official Hertz website. Ensure you have your product model number (HDP5) and proof of purchase available when seeking support.
