1. Introduction
The Keenso K-28 High to Low Audio Converter is designed to integrate aftermarket amplifiers and subwoofers into car audio systems that lack dedicated low-frequency RCA outputs. It converts high-frequency speaker-level signals from your car's head unit (CD, VCD, DVD player) into a low-frequency RCA output, suitable for connecting to an external amplifier. This device allows for the expansion of your car's audio capabilities without requiring a head unit replacement.
Image 1: Keenso K-28 High to Low Audio Converter, showing its compact design with RCA output jacks and speaker wire input.
2. Key Features
- High-Frequency to Low-Frequency Conversion: Converts high-level speaker output signals to low-level RCA output, enabling connection to car amplifier subwoofer inputs.
- Compatibility: Ideal for car CD, VCD, or DVD players that do not have a dedicated low-frequency RCA output.
- Easy Installation: Features a compact design for straightforward plug-and-play installation. A wiring diagram is typically provided for convenience.
- Subwoofer Integration: Facilitates the addition of a subwoofer to car audio systems lacking direct subwoofer output capabilities.
- Adjustable Output Level: Equipped with level adjustment controls to fine-tune the output signal for optimal amplifier matching.
Image 2: The Keenso K-28 converter shown within a car's dashboard environment, illustrating its application in converting high-frequency audio signals.
3. Specifications
| Model Number | Keensoibcnw0reza (K-28) |
| Brand | Keenso |
| Item Weight | 1.58 ounces |
| Input Voltage | 12 Volts |
| Output Voltage | 2 Volts |
| Color | Transparent |
| Material | Plastic, Electric Components |
| Dimensions (L*W*H) | Approx. 5.5 x 3.7 x 2.5 cm / 2.2 x 1.5 x 1.0 inches |
Image 3: Detailed dimensions of the Keenso K-28 converter, showing its compact size.
4. Setup and Installation
Before beginning installation, ensure your vehicle's audio system is turned off and the battery is disconnected to prevent electrical shorts or damage. Professional installation is recommended if you are unfamiliar with car audio wiring.
Wiring Diagram Overview:
The Keenso K-28 converter typically includes a wiring diagram on its packaging. The general connections are as follows:
- Input Connection (Speaker Wires): Connect the high-level speaker output wires from your car's head unit to the input wires of the converter. The converter has two groups of speaker line inputs (typically for left and right channels). Ensure correct polarity (positive to positive, negative to negative).
- Output Connection (RCA Cables): Connect standard RCA audio cables from the converter's RCA output jacks to the RCA input jacks of your aftermarket amplifier.
- Ground Wire: Connect the converter's ground wire (if present and separate) to a suitable chassis ground point in your vehicle.
Image 4: The converter displaying its two groups of speaker line inputs, ready for connection to the vehicle's speaker wires.
Installation Steps:
- Locate the speaker wires from your car's head unit that you intend to use as the signal source.
- Carefully strip a small portion of insulation from the speaker wires and the converter's input wires.
- Connect the corresponding speaker wires to the converter's input wires. Solder connections or use high-quality crimp connectors for secure and reliable contact.
- Connect RCA cables from the converter's output to your amplifier's input.
- Secure the converter in a safe, dry location, away from excessive heat or moisture.
- Reconnect the vehicle's battery and proceed to the operating instructions.
5. Operating Instructions
After successful installation, the Keenso K-28 converter requires minimal operation. Its primary function is signal conversion. However, it features adjustable level controls to optimize audio output.
Adjusting Output Levels:
- The converter includes small potentiometers (often labeled "LEVEL ADJUST") that allow you to fine-tune the output signal level.
- Use a small screwdriver to carefully turn these adjusters. Start with the levels set to minimum.
- Play audio through your car's system. Gradually increase the level adjusters on the converter until you achieve a clear, undistorted signal at your amplifier.
- Adjust the amplifier's gain settings as needed, ensuring that the overall sound is balanced and free from distortion. The goal is to provide a strong, clean signal to the amplifier without clipping.
Image 5: A close-up view of the converter, highlighting the 'LEVEL ADJUST' screws used for fine-tuning the audio output.
6. Maintenance
The Keenso K-28 High to Low Audio Converter is designed for durability and requires minimal maintenance. Follow these guidelines to ensure its longevity:
- Keep Dry: Ensure the converter remains dry and protected from moisture. Water can cause internal damage and electrical shorts.
- Avoid Extreme Temperatures: Do not expose the device to extreme heat or cold, as this can affect its electronic components.
- Clean Gently: If cleaning is necessary, use a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- Secure Connections: Periodically check all wiring connections to ensure they remain secure and free from corrosion. Loose connections can lead to signal loss or intermittent performance.
7. Troubleshooting
If you encounter issues with your Keenso K-28 High to Low Audio Converter, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from amplifier/subwoofer |
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| Distorted or poor sound quality |
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| Humming or buzzing noise |
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Video Guide:
For a visual guide on the product and its features, please watch the video below:
Video 1: An overview of the Keenso High to Low Converter, demonstrating its appearance and basic functionality.
8. Warranty and Support
For specific warranty information, please refer to the product packaging or contact the retailer where the product was purchased. Keenso aims to provide reliable products and customer satisfaction.
If you require further assistance or have questions not covered in this manual, please contact Keenso customer support through their official channels or the seller's support contact information.
