Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your EASWEL PAC LC-1 Universal Car Amplifier Bass Knob RCA Level Control. Please read this manual thoroughly before using the product to ensure proper function and safety.

Image: The EASWEL PAC LC-1 unit, featuring a black control box with a rotary knob, connected to RCA input and output cables. Two mounting screws are visible.
Product Features
- Universal Compatibility: Designed to integrate seamlessly with various car audio systems using RCA level input and output connections.
- Powerful Bass Control: Equipped with a dedicated rotary knob for convenient, customizable adjustment of low-frequency audio output.
- Surface Mount Design: Facilitates easy installation and mounting in a desired location, optimizing space within the vehicle.
- CE Certified: Manufactured to meet CE standards, ensuring product safety and reliability.
- Single Channel Amplification: Provides clear and robust sound signal control for a single audio channel, typically used for a subwoofer or dedicated speaker.
Package Contents
Verify that all items are present in the package:
- EASWEL PAC LC-1 Bass Knob RCA Level Control Unit
- Mounting Screws (2 pcs)

Image: The EASWEL PAC LC-1 unit displayed with the two included mounting screws, highlighting all components of the package.
Safety Information
Please observe the following safety precautions:
- Always disconnect the vehicle's battery before performing any electrical installation.
- Ensure all wiring connections are secure and properly insulated to prevent short circuits.
- Do not install the unit in locations where it may obstruct vehicle operation or safety devices.
- Consult a professional car audio installer if you are unsure about any installation steps.
- This device is designed for 12V DC automotive systems only.
Setup and Installation
Follow these steps for proper installation of the PAC LC-1 unit:
- Choose a Mounting Location: Select a secure, accessible location within your vehicle that does not interfere with driving controls or airbags. The surface mount design allows for flexible placement.
- Secure the Unit: Use the provided mounting screws to firmly attach the PAC LC-1 control box to the chosen surface.
- Connect RCA Input: Connect the RCA input cables (labeled "INPUT") from your head unit's pre-amp output or a line output converter to the corresponding RCA input jacks on the PAC LC-1.
- Connect RCA Output: Connect the RCA output cables (labeled "OUTPUT") from the PAC LC-1 to the RCA input jacks of your amplifier.
- Power Connection (if applicable): The PAC LC-1 is a passive device and typically does not require a separate power connection. It controls the signal level directly. Ensure your amplifier is properly powered.
- Test Functionality: After all connections are made, reconnect the vehicle's battery and test the audio system to ensure the bass knob functions correctly.

Image: An angled view of the EASWEL PAC LC-1, clearly showing the labeled RCA input and output cables for connection to audio components.

Image: A top-down view of the EASWEL PAC LC-1, illustrating the layout of the RCA connections and the central rotary control knob.
Operating Instructions
The PAC LC-1 provides simple, direct control over the audio signal level:
- Adjusting Bass Level: Rotate the knob clockwise to increase the bass output level.
- Decreasing Bass Level: Rotate the knob counter-clockwise to decrease the bass output level.
- This control acts as a master volume for the connected amplifier channel, allowing for on-the-fly adjustments without accessing the amplifier directly.
Maintenance
The EASWEL PAC LC-1 requires minimal maintenance:
- Keep the unit clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Avoid exposing the unit to excessive moisture or extreme temperatures.
- Periodically check all cable connections to ensure they remain secure.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound or low output from connected amplifier/subwoofer. |
|
|
| Distorted sound. |
|
|
| Intermittent sound. |
|
|
Specifications
| Brand | EASWEL |
| Model Number | LC 1 |
| Mounting Type | Surface Mount |
| Number of Channels | 1 |
| Certification | CE |
| UPC | 721618473009 |
| Approximate Dimensions (L x W x H) | 4.5 x 2.5 x 1 inches |
Warranty and Support
For warranty information or technical support, please refer to the contact information provided by your retailer or the manufacturer, EASWEL. Keep your purchase receipt as proof of purchase for any warranty claims.
Note: Specific warranty terms may vary by region and retailer.