Best High to Low Line Output Converter for Car Audio: Top 5 Picks and How to Choose
If you want to add an amplifier or subwoofer to a factory radio, a high-to-low line output converter is essential. These devices translate speaker-level signals into RCA-ready, low-level signals that your amplifier can safely use. This guide highlights five reliable options and explains who should choose each one, so you can pick the right model for your system and budget.
Summary table of the selected products:
| Product | Best For | Key Benefit |
|---|---|---|
| Kicker 46KISLOC2 | All-around upgrade with remote turn-on | Accurate sonic reproduction with DC offset remote wiring |
| NuIth Car Audio Converter | Budget-friendly two-channel upgrade | Simple level matching and bass adjustment |
| Scosche LOC80 | Wide compatibility, easy install | Versatile, solid performance for most cars |
| Scosche LOC2SL | Subwoofer-focused builds | Remote knob option and reliable bass handling |
| CT Sounds CT-LC2 | Premium bass restoration | BassLift technology for factory bass roll-off compensation |
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter
The KISLOC2 is best for buyers who want a compact, high-quality converter with a built-in remote turn-on capability. It converts factory speaker signals into both RCA outputs and a remote 12-volt wire, enabling a clean, turn-key connection to an external amplifier. This model supports up to 55 watts (16 volts) of input signal, making it suitable for many factory systems without overloading the converter. Choose this if you value accurate sound reproduction at varying volumes and want a straightforward install for a standard aftermarket amp setup.
Best for: Enthusiasts upgrading from factory sound to a clean, amplified system who also need remote turn-on compatibility.
Caution: The unit handles up to 55 watts; using a higher-power source may require a different model with greater input headroom.
NuIth Car Audio Speaker Wire to RCA Line Output Converter
The NuIth converter is a practical choice for two-channel or mono amplifier setups, including subwoofers, using stock or aftermarket stereo wiring. It converts high-level speaker signals to RCA outputs and provides a level gain adjustment to tailor bass response without stopping to re-tune the amplifier. It’s best for budget-conscious installers who still want reliable signal conversion and some control over bass levels during on-the-road adjustments.
Best for: Users adding a two-channel or subwoofer amp without complex wiring or extensive reconfiguration.
Caution: The gain adjustment is manual and on-device; precise tuning may require careful listening in the vehicle environment.
Scosche LOC80 Line Output Converter
The LOC80 is a versatile high-to-low converter designed for wide compatibility with factory and aftermarket systems. It emphasizes seamless integration, allowing you to connect an aftermarket amp or subwoofer with minimal signal loss. This model is ideal for builders seeking a reliable, easy-to-install option that works across many vehicle configurations and helps maximize the impact of a subwoofer or amp without rewiring.
Best for: Car owners who want a straightforward conversion with broad compatibility and easy installation.
Caution: Some installations may require additional adapters depending on vehicle harnesses, so check your car’s wiring before purchase.
Scosche LOC2SL Line Output Converter with Remote Knob
The LOC2SL variant adds a remote control knob for convenient on-dash bass and level adjustments. It maintains Scosche’s hallmark versatility and is well-suited for users who want hands-on tone shaping while driving. It’s a strong pick for those installing a dedicated subwoofer amp and needing precise bass control without accessing the trunk or amplifier itself.
Best for: Enthusiasts who want on-the-fly bass control and a simple install path for a subwoofer amp.
Caution: The remote knob adds an extra component to the install; ensure wiring routes accommodate the control cable for a clean finish.
CT Sounds CT-LC2 2-Channel Premium Line-Out Converter
The CT-LC2 offers two-channel output with BassLift technology that restores factory bass roll-off, delivering a fuller low end when you boost volume. It provides a dedicated bass output for subwoofers and a main output for full-range speakers, making it a solid choice for systems that want stronger bass without sacrificing midrange clarity. Best for buyers who want premium BassLift performance that compensates for factory bass limitations.
Best for: Car owners seeking enhanced bass fidelity and restoration of low-end performance when upgrading with a subwoofer or processor.
Caution: BassLift is most noticeable at higher listening levels; at very low volumes the bass improvement may be subtler.
Buying Guide: How To Choose The Right High To Low Line Output Converter
- Input power handling: Match the converter’s input rating with your factory head unit’s capability to avoid distortion or clipping.
- Output needs: Determine whether you need two-channel or single-channel/subwoofer-focused outputs. If you plan to run a subwoofer, prioritize models with dedicated bass output or BassLift-like features.
- Remote turn-on and integration: If your car’s wiring supports a remote turn-on, consider models with a built-in remote wire. It simplifies amplifier activation and reduces electrical noise.
- Compatibility and installation: Some units offer more universal compatibility. For complex vehicles, look for LOCs that emphasize seamless integration and easy installation without rewiring.
- Gain control and tone shaping: Onboard gain controls or remote knobs help tailor bass and overall level matching. This is valuable in vehicles with inconsistent speaker output or aftermarket components.
- Durability and build quality: Choose a device with solid shielding and reliable connectors to minimize hum, noise, or interference in the audio path.
- Future-proofing: If plans include bigger amps or multiple subwoofers, pick a model with higher input headroom and robust output options.
Frequently Asked Questions
- What does a high-to-low line output converter do?
It converts speaker-level signals into low-level RCA signals suitable for amplifiers and processors, enabling aftermarket upgrades from a factory radio.
- Do I need a bass-specific converter for a subwoofer?
Not always, but models with dedicated subwoofer outputs or BassLift features can improve bass performance and reduce roll-off.
- Is remote turn-on important for amplifiers?
Yes, it helps ensure clean startup and reduces noise by powering the amp at the same time as the head unit.
- Can I use any LOC for any car?
Most LOCs are versatile, but vehicle-specific wiring or harnesses may require additional adapters, so check compatibility before purchase.
- Should I choose a two-channel or mono converter for a subwoofer?
For a dedicated subwoofer, a mono or two-channel unit with a separate bass output is often ideal, but a two-channel with a dedicated bass path can work well in many setups.
- What is BassLift technology?
BassLift restores the factory bass response that can be reduced by the head unit’s high-volume behavior, providing fuller low-end performance when the volume increases.