Do you love your car’s factory stereo, but crave the deep, punchy bass of an aftermarket subwoofer? Many modern vehicles come with complex, built-in infotainment systems that are nearly impossible to replace. This leaves music lovers stuck with lackluster sound quality and no simple way to upgrade their audio setup. If you want to add an amplifier without ripping out your dashboard, a Line Output Converter (LOC) is the missing link you need.
Choosing the right converter can feel overwhelming. The market is flooded with cheap, low-quality gadgets that often introduce annoying engine noise or distort your music. You might worry about signal loss or complex wiring diagrams that look like a foreign language. It is frustrating to spend money on gear that fails to deliver the crisp, clean sound you deserve.
This guide cuts through the confusion. We will explain exactly how a Line Output Converter works and why it is the smartest way to bridge the gap between your factory radio and new speakers. You will learn how to spot the difference between basic models and high-end units that preserve your audio quality. By the end of this post, you will feel confident picking the perfect device for your specific ride. Let’s dive into the details and get your car audio system sounding exactly the way you want it.
Top Line Output Converter Recommendations
- Add an amplifier to nearly any radio with the KISLOC2 Stereo Line-Out Converter. Experience true sonic accuracy at any volume level, with all the sparkling highs and thunderous lows of your original audio.
- Using nothing more than your factory speaker wires, the innovative KISLOC2 automatically converts the speaker signal into both an RCA signal and a powerful 100 milli-amp, 12-volt remote wire using DC offset.
- Accepts up to 55 watts (16 volts) of input signal
- Compatible with OEM Radios, aftermarket radios, and smart radios
- Accepts Up to 55 Watts (16 volts) of Input Signal
- Flat 20Hz - 20kHz Frequency Range at All Volume Levels
- Applies 60-ohm Load to Each Channel to Circumvent Open-Circuit Protection
- RCA Line Outputs Up to 8 Volts RMS
- 𝗨𝗽𝗴𝗿𝗮𝗱𝗲 𝘆𝗼𝘂𝗿 𝗮𝘂𝗱𝗶𝗼 𝘀𝘆𝘀𝘁𝗲𝗺 𝘄𝗵𝗶𝗹𝗲 𝗸𝗲𝗲𝗽𝗶𝗻𝗴 𝘆𝗼𝘂𝗿 𝗳𝗮𝗰𝘁𝗼𝗿𝘆 𝘀𝘁𝗲𝗿𝗲𝗼: Convert speaker-level signals up to 400W (40V) per channel from your OEM radio or amplifier to high quality pre-amp output signals directed to aftermarket subwoofers, amplifiers, and processors.
- 𝗦𝗲𝗮𝗺𝗹𝗲𝘀𝘀𝗹𝘆 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗲 𝘄𝗶𝘁𝗵 𝗹𝗮𝘁𝗲 𝗺𝗼𝗱𝗲𝗹 𝘃𝗲𝗵𝗶𝗰𝗹𝗲𝘀: Onboard load selection switches allow factory amplifiers in modern systems to detect speaker loads and continue passing audio. Choose between 20 ohms, 60 ohms, and 20k ohms.
- 𝗕𝗼𝗼𝘀𝘁 𝘄𝗲𝗮𝗸 𝗳𝗮𝗰𝘁𝗼𝗿𝘆 𝗿𝗮𝗱𝗶𝗼 𝘀𝗶𝗴𝗻𝗮𝗹𝘀: Built-in line driver allows you to provide optimum signals for downstream amplifiers, subwoofers and processors.
- 𝗖𝗼𝗻𝘁𝗿𝗼𝗹 𝘀𝘂𝗯𝘄𝗼𝗼𝗳𝗲𝗿 𝗹𝗲𝘃𝗲𝗹𝘀 𝗳𝗿𝗼𝗺 𝘁𝗵𝗲 𝗱𝗿𝗶𝘃𝗲𝗿’𝘀 𝘀𝗲𝗮𝘁: Optional ACR-1 dash knob remote includes a 20-foot remote cable and metal housing with integrated removable mounting tabs for custom flush mount installations (sold separately).
- 𝗖𝗵𝗼𝗼𝘀𝗲 𝘆𝗼𝘂𝗿 𝘁𝘂𝗿𝗻-𝗼𝗻 𝗺𝗼𝗱𝗲: Features selectable Great Turn On (GTO) signal sense to automatically power the LOC or remote 12V input for manual control.
- Unmatched Versatility - Compatible with a wide range of car audio systems, this high to low audio converter offers flexible installation options, making it a go-to solution for converting speaker level signals to RCA line level signals for optimal sound
- Seamless Integration - Effortlessly integrate your factory stereo with an aftermarket amplifier using this line level converter, ensuring no loss of sound quality; ideal for boosting your car’s audio performance without complex rewiring
- Enhanced Audio Experience - Transform your car audio system with the Scosche LOC2SL line output converter, delivering crisp and clear sound quality for your subwoofer; perfect for audiophiles seeking high-fidelity sound
- Compact and Durable Design - Engineered by Scosche, the LOC2SL line output converter is compact and built to last, fitting easily into tight spaces while maintaining durability; a reliable upgrade for any car audio enthusiast
- Optimal Signal Quality - Ensure maximum audio performance with this OEM quality RCA converter for car audio, designed to minimize signal interference and deliver clean, powerful sound; the perfect addition to your custom car audio setup
- 𝗨𝗽𝗴𝗿𝗮𝗱𝗲 𝘆𝗼𝘂𝗿 𝗮𝘂𝗱𝗶𝗼 𝘀𝘆𝘀𝘁𝗲𝗺 𝘄𝗵𝗶𝗹𝗲 𝗸𝗲𝗲𝗽𝗶𝗻𝗴 𝘆𝗼𝘂𝗿 𝗳𝗮𝗰𝘁𝗼𝗿𝘆 𝘀𝘁𝗲𝗿𝗲𝗼: Convert speaker-level signals up to 400W per channel from your OEM radio or amplifier to high quality pre-amp output signals directed to aftermarket subwoofers, amplifiers, and processors.
- 𝗠𝗮𝘅𝗶𝗺𝗶𝘇𝗲 𝘆𝗼𝘂𝗿 𝗯𝗮𝘀𝘀: AccuBASS processing technology corrects and restores bass roll-off when the volume is increased on the factory radio.
- 𝗦𝗮𝘃𝗲 𝘃𝗲𝗵𝗶𝗰𝗹𝗲 𝘀𝗽𝗮𝗰𝗲: A compact slim chassis with integrated mounting brackets enables quick and easy installation without taking up extra room in your car. Dimensions: 5.4”L x 3.25”D x 1.5”H (6.5”L including mounting brackets).
- 𝗥𝗲𝘁𝗮𝗶𝗻 𝗶𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁 𝗳𝗮𝗰𝘁𝗼𝗿𝘆 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀: Including the use of factory volume and steering wheel controls.
- 𝗚𝗮𝗶𝗻 𝗳𝘂𝗹𝗹 𝗰𝗼𝗻𝘁𝗿𝗼𝗹 𝗼𝘃𝗲𝗿 𝘆𝗼𝘂𝗿 𝘀𝗼𝘂𝗻𝗱: Fixed and variable outputs with discrete onboard level controls allow you customize your audio and make adjustments easily. *Does not retain fader control when running multiple amplifiers. For applications where this is desired, use LC5i PRO, LC6i, LC7i, LC7i PRO.
- Unmatched Versatility - Compatible with a wide range of car audio systems, this high to low audio converter offers flexible installation options, making it a go-to solution for converting speaker level signals to RCA line level signals for optimal sound
- Seamless Integration - Effortlessly integrate your factory stereo with an aftermarket amplifier using this line level converter, ensuring no loss of sound quality; ideal for boosting your car’s audio performance without complex rewiring
- Enhanced Audio Experience - Transform your car audio system with the Scosche LOC80 line output converter, delivering crisp and clear sound quality for your subwoofer; perfect for audiophiles seeking high-fidelity sound
- Compact and Durable Design - Engineered by Scosche, the LOC80 line output converter is compact and built to last, fitting easily into tight spaces while maintaining durability; a reliable upgrade for any car audio enthusiast
- Optimal Signal Quality - Ensure maximum audio performance with this OEM quality RCA converter for car audio, designed to minimize signal interference and deliver clean, powerful sound; the perfect addition to your custom car audio setup
- Adjustable Line Output Converter
- Use the SNI-35 when adding an amplifier to a factory radio to convert the radio's speaker level output to the lower amplifier (RCA) level input
- Utilize Audio Transformer for Noise Isolation
- Phase Adjusted
- A 2-channel LOC is straightforward to install and use, making it an excellent choice for basic audio system upgrades, it typically has two input channels and two output channels
- If you are primarily concerned with upgrading your front speakers or adding a subwoofer to your car audio system, a 2-channel LOC is sufficient for the task
- If you want to keep your factory head unit for its integrated features, a25-channel LOC allows you to do so while still upgrading your audio system
- OFC cables are known for their high conductivity and low resistance, which means they can transmit audio signals with minimal loss and interference
- The longer cable length allows for cleaner signal transmission, ensuring that the audio signal retains its integrity even over extended distances
The Ultimate Guide to Line Output Converters
A Line Output Converter (LOC) is a vital tool for car audio enthusiasts. It allows you to connect an aftermarket amplifier or subwoofer to a factory car stereo. Most factory radios lack RCA outputs. The LOC solves this problem by turning high-level speaker wire signals into low-level RCA signals. This simple device bridges the gap between your stock system and your new audio gear.
Key Features to Look For
When shopping for an LOC, focus on these essential features:
- Channel Count: Choose a 2-channel converter for a simple subwoofer setup. Choose a 4-channel converter if you plan to power your door speakers.
- Voltage Output: A higher voltage output (like 4V or higher) provides a cleaner signal to your amplifier. This helps reduce background noise.
- Remote Turn-On: Look for an “Auto Turn-On” feature. This detects the audio signal and turns your amplifier on automatically. It saves you from running an extra wire to your fuse box.
- Adjustable Gain: This dial allows you to match the volume levels between your head unit and your new amplifier.
Important Materials and Build Quality
Quality matters in audio electronics. Look for units housed in sturdy metal casings. Metal cases help dissipate heat and protect internal parts from vibrations. Cheap plastic units might crack or cause interference. High-quality internal transformers are also crucial. They ensure that the sound remains clear without adding static or humming noises.
Factors That Improve or Reduce Quality
Several factors determine how good your music will sound:
What improves quality?
Units with balanced inputs perform best. They cancel out electrical noise from the car’s engine. Using high-quality RCA cables also helps maintain signal integrity from the LOC to the amp.
What reduces quality?
Poor grounding is the biggest enemy of sound. If the LOC is not grounded properly, you will hear a whining noise that changes with your engine speed. Also, low-cost converters often lack “DC offset” detection. This can lead to a loud “pop” sound when you turn your car on or off.
User Experience and Use Cases
Most users buy an LOC because they want more bass. If you love your factory radio’s look but want a subwoofer, the LOC is your best friend. Installation is usually straightforward. You tap into the existing speaker wires, connect the RCA cables, and attach a power and ground wire. It is a great project for beginners who want to upgrade their sound without replacing their entire dashboard.
10 Frequently Asked Questions
Q: Do I need an expensive LOC?
A: Not always. If you have a basic system, a mid-range LOC works fine. If you have a high-end sound system, a premium unit will provide much cleaner audio.
Q: Will an LOC make my music sound worse?
A: A high-quality LOC should be transparent. You should not notice a difference in sound quality if the unit is installed correctly.
Q: Can I install an LOC myself?
A: Yes. If you are comfortable with basic wiring and have a few tools, it is a very manageable DIY project.
Q: What is a “High-Level” signal?
A: This is the raw power signal coming from your radio that normally goes directly to your speakers.
Q: Why is my music making a whining noise?
A: This is likely a grounding issue. Ensure your LOC has a solid, clean connection to the metal chassis of the car.
Q: Does an LOC need power?
A: Most modern LOCs require a 12-volt power connection to function and provide a remote turn-on signal.
Q: Can I use an LOC for door speakers?
A: Yes. A 4-channel LOC is perfect for adding an amplifier to your front and rear door speakers.
Q: What happens if I set the gain too high?
A: Setting the gain too high can cause “clipping.” This creates distortion and can eventually damage your speakers or amplifier.
Q: Is an LOC better than a new head unit?
A: A new head unit often offers better sound quality, but an LOC is cheaper and keeps your car looking original.
Q: How do I know which wires to tap?
A: You should look up a wiring diagram for your specific car model online to identify the speaker wires correctly.