1. Introduction
The Scosche FAI4 is a speaker level converter amplifier interface designed to integrate aftermarket amplifiers with car stereos that lack dedicated RCA outputs. This device converts high-level speaker wire signals into low-level RCA signals, enabling the connection of 2-channel or 4-channel amplifiers to factory or aftermarket head units. It also facilitates the use of replacement car stereos with existing factory amplified systems.
2. Product Contents
- Scosche FAI4 Speaker Level Converter Amplifier Interface Unit
- Instruction Manual (this document)
3. Features
- Converts car stereo speaker wire outputs to RCA cable outputs.
- Enables the addition of 4-channel and 2-channel amplifiers to factory or aftermarket car stereos.
- Allows replacement car stereos to be used with most factory amplified systems.
- Provides adjustments for level matching and fine-tuning system volume.
- Compatible with high-power car stereos up to 80 Watts per channel.
4. Specifications
| Model Number | FAI4 |
| Item Weight | 4.8 ounces |
| Product Dimensions | 5.3 x 3.4 x 1.4 inches |
| Max Power Handling | 80 Watts per channel |
5. Setup and Installation
The Scosche FAI4 is designed for integration into a vehicle's audio system. Proper installation is crucial for optimal performance and to prevent damage to components. If you are unfamiliar with car audio wiring, it is recommended to seek professional installation.
5.1 Wiring Connections
The FAI4 connects to your car stereo's speaker wire outputs and converts these high-level signals into low-level RCA outputs for your amplifier.
- Identify Speaker Wires: Locate the speaker wire outputs from your car stereo. These are typically color-coded.
- Connect Inputs: Connect the car stereo's speaker wires to the corresponding "INPUT" terminals on the FAI4 unit. Ensure correct polarity (positive to positive, negative to negative). The FAI4 supports up to four speaker-level inputs.
- Connect Outputs: Connect RCA cables from the "OUTPUT" terminals on the FAI4 to the RCA inputs on your aftermarket amplifier. The FAI4 provides four RCA outputs (Right Front, Left Front, Right Rear, Left Rear).
- Ground Connection: Ensure a proper common ground connection for the FAI4 unit as indicated on the device.
Figure 1: The Scosche FAI4 unit, a blue translucent box, showing its input and output terminals, gain adjustment screws, and the Scosche logo. It features speaker wire inputs and RCA outputs for connecting to a car stereo and an amplifier.
5.2 Gain Adjustment
The FAI4 includes gain adjustment controls for both "LINE OUT" and "FACTORY AMP" (if applicable). These adjustments allow for level matching between the FAI4's output and your amplifier's input sensitivity, ensuring optimal audio quality and preventing distortion.
- Use a small screwdriver to carefully adjust the gain screws on the FAI4.
- Start with the gain settings at their minimum and gradually increase them while monitoring audio output for clarity and absence of distortion.
- Refer to your amplifier's instruction manual for recommended gain setting procedures.
6. Operation
Once installed and properly adjusted, the Scosche FAI4 operates automatically, converting the speaker-level signals from your car stereo into RCA signals for your amplifier. The primary operational aspect involves the initial gain setting to match your system's components. No further user interaction is typically required during normal use.
7. Maintenance
The Scosche FAI4 requires minimal maintenance.
- Keep the unit free from dust and moisture.
- Ensure all connections remain secure. Periodically check wiring for any signs of wear or corrosion.
- Avoid exposing the unit to extreme temperatures.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No audio output | Incorrect wiring connections; Amplifier not powered; Gain set too low. | Verify all speaker wire inputs and RCA outputs are correctly connected and secure. Check amplifier power and remote turn-on. Increase FAI4 gain settings gradually. |
| Distorted audio | Gain set too high; Poor ground connection. | Decrease FAI4 gain settings. Ensure a clean and secure ground connection. Check for damaged speaker wires. |
| Humming or buzzing noise | Ground loop; Poor shielding on RCA cables. | Ensure all components share a common ground point. Use high-quality, shielded RCA cables. Check for proper grounding of the FAI4 unit. |
9. Warranty and Support
The Scosche FAI4 is backed by a 1-year warranty. For technical assistance or warranty claims, please contact Scosche customer support.
Scosche also provides Lifetime Tech Support for this product.
For further assistance, visit the official Scosche website or contact their customer service department.
