1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your PAC SNI-50A Adjustable High Power 2-Channel Line Out Converter. The SNI-50A is designed to convert high-level (speaker-level) audio signals from a factory or aftermarket car stereo into low-level (RCA line-level) signals, allowing you to connect an aftermarket amplifier. This device ensures optimal sound quality and system compatibility.
2. Safety Information
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.
- Always disconnect the vehicle's battery before beginning any electrical installation.
- Ensure all wiring is properly insulated and secured to prevent short circuits and damage.
- Consult a professional car audio installer if you are unsure about any part of the installation process.
- Do not expose the device to moisture or extreme temperatures.
3. Product Overview and Features
The PAC SNI-50A is a compact and efficient solution for integrating aftermarket amplifiers with factory audio systems. Its key features include:
- 2-Channel Adjustable Output: Provides two channels of adjustable low-level RCA output.
- High Power Input: Capable of handling up to 50 watts maximum input per channel from speaker-level signals.
- Linear Frequency Response: Delivers a linear 20 to 20,000Hz output, accurately reproducing the input signal.
- Transformer Isolated: Designed with transformer isolation for optimal sound quality and performance, minimizing noise.
- Correct Phasing: Maintains correct audio phasing for accurate sound reproduction.
Figure 1: The PAC SNI-50A Adjustable High Power 2-Channel Line Out Converter, showing its compact black casing, PAC logo, model number, speaker wire input harness, and two RCA output jacks.
4. Package Contents
Verify that all items are present in the package:
- PAC SNI-50A Adjustable High Power 2-Channel Line Out Converter
- Wiring harness (pre-attached)
5. Setup and Installation
Proper installation is crucial for optimal performance. It is recommended that installation be performed by a qualified professional.
5.1 Wiring Connections
- Identify Speaker Wires: Locate the left and right speaker output wires from your factory or aftermarket head unit. These are typically positive (+) and negative (-) pairs for each channel.
- Connect High-Level Input: Connect the corresponding speaker wires from your head unit to the input wires of the SNI-50A's wiring harness. Ensure correct polarity (positive to positive, negative to negative) for each channel. The SNI-50A typically uses color-coded wires for left and right channels.
- Connect RCA Output: Plug your RCA cables from the SNI-50A's RCA output jacks into the input jacks of your aftermarket amplifier.
- Grounding: While the SNI-50A is transformer isolated, a proper ground connection for the amplifier and head unit is essential for noise-free operation.
5.2 Mounting
Mount the SNI-50A in a secure, dry location away from excessive heat or moisture. Ensure it is not exposed to direct sunlight or moving parts. Use screws or zip ties to secure the unit.
6. Operating Instructions
The PAC SNI-50A is designed for straightforward operation once installed. Its primary function is to convert speaker-level signals to RCA line-level signals, which are then sent to an amplifier.
6.1 Adjusting Output Level
The SNI-50A features adjustable output levels. These adjustments are typically small potentiometers (screws) on the unit itself, allowing you to match the output signal strength to the input sensitivity of your amplifier. Use a small screwdriver to carefully turn the adjustment screws. Start with the adjustments at their minimum setting and gradually increase them until the desired volume and clarity are achieved without distortion.
- Turn the head unit volume to about 75% of its maximum.
- Adjust the SNI-50A's output level until the amplifier's input gain is set correctly (refer to your amplifier's manual for gain setting instructions).
- Avoid setting the output level too high, as this can introduce distortion.
7. Maintenance
The PAC SNI-50A requires minimal maintenance to ensure long-term performance.
- Cleaning: Periodically wipe the unit with a soft, dry cloth to remove dust. Do not use liquid cleaners or solvents.
- Connections: Occasionally check all wiring connections to ensure they are secure and free from corrosion.
- Environment: Ensure the unit remains in a dry, stable environment, protected from extreme temperatures and vibrations.
8. Troubleshooting
If you experience issues with your SNI-50A, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from amplifier |
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| Distorted sound |
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| Engine noise or hum |
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9. Specifications
| Model | SNI-50A |
| Channels | 2-Channel |
| Maximum Input Power | 50 watts per channel |
| Frequency Response | 20 Hz - 20,000 Hz |
| Isolation | Transformer Isolated |
| Dimensions (L x W x H) | 7.5 x 6.15 x 1.8 inches |
| Weight | 5.6 ounces (0.35 lbs) |
10. Warranty and Support
For warranty information and technical support, please refer to the official PAC website or contact their customer service department. Keep your purchase receipt as proof of purchase.
PAC Customer Support: Please visit pac-audio.com/support for the latest support resources, FAQs, and contact information.
