1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Focal IMPULSE4.320 Ultra Compact 4/3/2-Channel Amplifier and the Focal IY-AC 'Y' Adapter Cable. The IMPULSE4.320 amplifier is designed to significantly enhance your vehicle's audio system with its compact D-Class technology, offering powerful sound in a small footprint. The IY-AC adapter cable facilitates a straightforward, plug-and-play connection to your vehicle's original head unit, ensuring seamless integration without complex modifications.
2. Safety Information
- Always disconnect the vehicle's battery before performing any electrical work to prevent short circuits and electrical shock.
- Ensure all wiring is properly insulated and secured to prevent damage from vibration or abrasion.
- Avoid installing the amplifier in locations exposed to direct sunlight, excessive heat, moisture, or dust.
- Professional installation is recommended for optimal performance and safety.
- Do not attempt to open or modify the amplifier. This will void the warranty and may cause damage to the unit or vehicle.
- Use only fuses of the specified rating. Incorrect fuses can cause damage or fire.
3. Package Contents
Verify that all items are present in the package:
- Focal IMPULSE4.320 Ultra Compact 4/3/2-Channel Amplifier
- Focal IY-AC 'Y' Adapter Cable (ISO Standard, 1 meter length)
4. Product Overview
The Focal IMPULSE4.320 amplifier is engineered for discreet integration and powerful audio output. Its D-Class architecture allows for high efficiency and a very compact size, making it suitable for installation in confined spaces within your vehicle's dashboard or under seats.
Image 4.1: Top view of the Focal IMPULSE4.320 Ultra Compact Amplifier. This image shows the sleek, black casing with the Focal logo and 'IMPULSE 4.320 - D CLASS COMPACT AMPLIFIER' text.
Key features include:
- Ultra-compact design: Facilitates easy installation in various vehicle locations.
- D-Class amplification: Provides high power output with excellent efficiency.
- 4/3/2 Channel Mode: Versatile configuration options for different speaker setups.
- Compatibility: Works with both OEM (original equipment manufacturer) and aftermarket head units.
- Automatic start-up: Integrates seamlessly with your original head unit's power cycle.
The Focal IY-AC 'Y' Adapter Cable is specifically designed for the IMPULSE4.320, providing a direct, solder-free connection to ISO standard head units. This ensures a clean and reversible installation.
Image 4.2: The Focal IY-AC 'Y' Adapter Cable. This image displays the full length of the adapter cable with its various connectors, designed for plug-and-play installation.
5. Setup and Installation
The IMPULSE4.320 amplifier and IY-AC adapter cable are designed for easy plug-and-play installation. No soldering or modification of the original manufacturer equipment is required.
5.1 Pre-Installation Steps
- Disconnect Battery: Before starting any electrical work, disconnect the negative terminal of your vehicle's battery to prevent electrical hazards.
- Choose Mounting Location: Select a dry, well-ventilated location for the amplifier, away from heat sources and direct sunlight. Common locations include behind the dashboard, under a seat, or in the trunk. Ensure adequate space for wiring and ventilation.
- Access Head Unit: Carefully remove your vehicle's head unit (car stereo) to access its wiring harness. Refer to your vehicle's service manual for specific instructions on head unit removal.
5.2 Connecting the IY-AC Adapter Cable
Image 5.1: Close-up of the IY-AC adapter cable connectors. This image highlights the various plugs and sockets used for connecting to the head unit and amplifier.
- Connect to Head Unit: Disconnect the vehicle's original wiring harness from the back of your head unit. Connect the appropriate end of the Focal IY-AC 'Y' Adapter Cable to the head unit.
- Connect Vehicle Harness: Connect the vehicle's original wiring harness to the corresponding connector on the IY-AC adapter cable.
- Connect to Amplifier: Connect the remaining end of the IY-AC adapter cable to the input/output harness of the Focal IMPULSE4.320 amplifier. Ensure all connections are secure.
5.3 Amplifier Mounting and Final Connections
Image 5.2: The Focal IMPULSE4.320 amplifier shown alongside the IY-AC adapter cable, illustrating how they connect to form a complete system.
- Mount Amplifier: Securely mount the IMPULSE4.320 amplifier in your chosen location using appropriate fasteners. Ensure it is stable and will not vibrate loose.
- Speaker Connections: Connect your speakers to the amplifier's output terminals. The IMPULSE4.320 supports 4, 3, or 2 channel configurations. Refer to the amplifier's specific wiring diagram for your desired setup.
- Power and Ground: The IY-AC cable handles power and ground connections via the ISO harness. Ensure the fuse on the IY-AC cable is correctly installed and rated.
- Reconnect Battery: Once all connections are verified and secure, reconnect the negative terminal of your vehicle's battery.
- Test System: Turn on your vehicle's ignition and head unit. Test the audio system to ensure proper operation. The amplifier features automatic start-up.
6. Operating Instructions
The Focal IMPULSE4.320 amplifier operates automatically once correctly installed. It will power on and off with your vehicle's head unit. Audio adjustments, such as volume, balance, fader, and basic equalization, are typically controlled directly through your car's head unit.
- Power On/Off: The amplifier will automatically turn on when your head unit is activated and turn off when the head unit is powered down.
- Volume Control: Adjust the overall system volume using your head unit's volume control.
- Audio Settings: Utilize your head unit's audio settings (bass, treble, balance, fader) to fine-tune the sound to your preference.
7. Maintenance
The Focal IMPULSE4.320 amplifier requires minimal maintenance to ensure long-term performance.
- Cleaning: Periodically wipe the amplifier's exterior with a soft, dry cloth to remove dust. Do not use harsh chemicals or abrasive cleaners.
- Ventilation: Ensure that the amplifier's cooling fins are not obstructed to allow for proper heat dissipation.
- Connections: Occasionally check all wiring connections to ensure they remain secure and free from corrosion.
8. Troubleshooting
If you encounter issues with your Focal IMPULSE4.320 amplifier, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from speakers | Amplifier not powered on; incorrect wiring; head unit issue; blown fuse. | Check battery connection. Verify IY-AC cable connections to head unit and amplifier. Ensure head unit is on and outputting signal. Check fuse on IY-AC cable. |
| Distorted sound | Input signal too high; poor speaker connections; damaged speakers. | Reduce head unit volume. Check speaker wiring for shorts or loose connections. Test with different speakers if possible. |
| Amplifier gets hot | Insufficient ventilation; prolonged high volume use; incorrect speaker impedance. | Ensure mounting location has adequate airflow. Reduce volume. Verify speaker impedance matches amplifier specifications. |
| Amplifier does not turn on | No power from head unit; faulty IY-AC cable; blown fuse. | Confirm head unit is powered on. Check IY-AC cable for damage. Inspect and replace fuse if necessary. |
9. Specifications
Detailed technical specifications for the Focal IMPULSE4.320 amplifier and IY-AC adapter cable:
| Feature | Specification |
|---|---|
| Model | IMPULSE4.320 |
| Amplifier Type | D Class Ultra-Compact |
| Channels | 4/3/2 Channel Mode |
| CEA Power (4 Ohms) | 4 x 55W rms |
| Power Max (2 Ohms) | 4 x 80W rms |
| Power Bridged (4 Ohms) | 2 x 160W rms |
| Bandwidth | 10Hz / 20KHz |
| Minimum THD | 0.02% |
| SNR | 80 dBA |
| Weight | 1.2 lbs (0.54 kg) |
| Dimensions (L x W x H) | 6-7/8 x 2-5/8 x 1-7/8 inches (175 x 66.5 x 47mm) |
| IY-AC Cable Length | 1 meter |
| ISO Standard Compatible | Yes |
| UPC | 841992137905 |
10. Warranty Information
The Focal IMPULSE4.320 amplifier is covered by a 2-Year Manufacturer Warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims. For specific terms and conditions, refer to the warranty documentation included with your product or contact Focal customer support.
11. Support
For further assistance, technical support, or warranty inquiries, please contact Focal customer service or visit their official website. You can also find additional resources and product information on the Focal Store on Amazon.
Manufacturer: Focal