Best Line Converter for Amp: Top Picks for Seamless Car Audio Upgrades
Answering the common question “which line converter should I choose for my amp?” this guide highlights five reliable options that convert speaker-level signals to RCA line-level outputs. These converters are best for aftermarket amp integration, adding subwoofers, or enhancing factory radio systems. Ideal buyers include listening enthusiasts upgrading factory systems, DIY installers seeking straightforward installation, and car owners who want cleaner signal paths without extensive rewiring.
Summary table of chosen products
| Product | Best For | Key Benefit | Input Power |
|---|---|---|---|
| Kicker 46KISLOC2 K-Series Stereo Line-Output Converter | Compact systems | Low-profile, high-quality line-out with remote turn-on | Up to 55W |
| Scosche LOC80 Line Output Converter | Wide compatibility | Versatile installation options and clean sound | 2-channel RCA |
| Scosche LOC2SL Line Output Converter with Remote Knob | Subwoofer setups | Remote control knob for easy bass adjustments | 2-channel RCA |
| NuIth Car Audio Speaker Wire to RCA Converter | Budget-conscious builds | 2-channel RCA outputs from speaker wires | 2-channel |
| Skar Audio SKAR2CH-LOC 2-Channel Converter | OEM and aftermarket radios | Flat 20Hz – 20kHz range at all levels | 2-channel |
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter

The KISLOC2 provides a compact line-output solution that converts a speaker signal into both RCA and a 12-volt remote wire. It supports up to 55 watts of input, making it suitable for many factory radio setups where space is limited. Best for buyers who want a minimal footprint without sacrificing signal quality. A potential limitation is the reliance on DC offset for the remote turn-on; ensure your vehicle’s wiring is compatible.
Scosche LOC80 Line Output Converter

The LOC80 stands out for its broad compatibility and flexible installation options. It efficiently converts higher-level signals to RCA line level signals for aftermarket amplifiers or subwoofers. Best for users seeking a reliable, straightforward upgrade to improve overall sound quality without rewiring. It’s a strong choice when you need seamless integration with factory or aftermarket units. A caveat is that precise performance may rely on the rest of the audio chain’s compatibility.
Scosche LOC2SL Line Output Converter with Remote Knob

The LOC2SL adds a handy remote control knob for adjusting bass output, making it ideal for those who want on-the-fly tonal shaping. It supports 2-channel RCA outputs and is designed for easy installation with limited space. Choose this if you value quick, tactile bass control. A limitation is the need for a compatible mounting location for the knob in smaller interiors.
NuIth Car Audio Speaker Wire to RCA Converter

The NuIth converter offers a practical solution for adding amplifiers or a subwoofer to a stock stereo by converting speaker wires into RCA outputs. It is oriented toward budget-conscious buyers who still want useful high-to-low signal conversion and a bass-focused output. Fitness for specific car models can depend on factory wiring layouts; verify compatibility before purchase.
Kicker 46KISLOC Interconnect, Speaker to RCA W/Line-Out Converter

This Kicking interconnect converter is noted for accommodating OEM radios with short circuit protection, delivering up to 8 volts of output. It is sonically neutral and compact, making it ideal for tight installs. Choose this if space is at a premium and you need a reliable, low-footprint solution. A possible limitation is that it may be best suited to specific OEM configurations, so verify radio type compatibility.
Skar Audio SKAR2CH-LOC 2-Channel Converter

The SKAR2CH-LOC provides compatibility across OEM and aftermarket radios with a wide input capacity (up to 55 watts). It offers a flat frequency response from 20 Hz to 20 kHz at all volume levels, which makes it suitable for those seeking reliable bass and treble balance. Best for users wanting a straightforward, broad-compatibility converter. A consideration is ensuring your head unit can feed sufficient excitation to maximize its 55 W input rating.
Buying Guide
What should you consider when choosing a line-out converter for an amplifier?
- Compatibility: Check if the converter works with factory or aftermarket radios, and whether it matches your vehicle’s wiring and head unit type.
- Input power handling: Consider the maximum wattage the converter can accept to avoid distortion or clipping when paired with an amp.
- Output options: Ensure the converter provides RCA outputs and, if needed, a remote turn-on lead for your amp.
- Remote control features: Some models include a remote knob for bass control or a remote turn-on output for convenience.
- Size and mounting: Look for a compact design when space is limited under the dash or behind the glove box.
- Sound quality: Prioritize units that preserve signal fidelity across the entire frequency range to maintain original highs and lows.
FAQs
- Do line-out converters affect bass performance? Yes, they enable sending a low-level signal to aftermarket amplifiers and subs, which can improve bass presence if properly configured.
- Can I install a line-out converter myself? Many models are designed for DIY installation with standard wire taps and RCA outputs, but follow the manufacturer’s instructions and disconnect the battery before wiring.
- Will a line-out converter damage my factory radio? When used within its specified input range and wired correctly, it should not.
- What is the advantage of a remote knob on a line-out converter? It allows quick, on-the-fly adjustments to bass output without accessing the amp or head unit.
- Is higher wattage input always better? Not necessarily; it must match your amplifier’s requirements to avoid clipping or signal loss, so verify system compatibility.
- Are there alternatives to line-out converters? Yes, some vehicles may benefit from integrated processor solutions or direct-output OEM interface adapters depending on the system.