If you’re looking to add an amplifier or subwoofer to a factory radio, a high-quality RCA line-out converter (LOC) is the answer. These adapters translate speaker-level signals into RCA line-level signals suitable for after-market amps, while preserving sound quality and minimizing noise. The following five products are well-suited for different vehicle setups, from compact dashboards to full-system upgrades. The selection focuses on compatibility with OEM radios, reliability, and ease of installation.
| Product | Brand | Best For |
|---|---|---|
| Kicker 46KISLOC2 K-Series Stereo Line-Output Converter | KICKER | Best for high-fidelity signal with remote turn-on and solid compatibility |
| Skar Audio SKAR2CH-LOC 2-Channel LOC | Skar Audio | Best for flexible input and wide frequency response |
| NuIth Car Audio Speaker Wire to RCA LOC | NuIth | Best for straightforward two-channel upgrades |
| Scosche LOC2SL Line Output Converter | Scosche | Best for versatile installation and subwoofer setups |
| Kicker 46KISLOC K-Series Interconnect | KICKER | Best for compact footprint and reliable 2-channel conversion |
Note: Each product is designed to help connect factory radios to external amplifiers or subwoofers. The table above highlights a quick, at-a-glance guide to who each product is best for.
Kicker 46KISLOC2 K-Series Stereo LOC
This 2-channel LOC converts speaker-level signals into both RCA outputs and a 12-volt remote turn-on wire. It supports up to 55 watts input (16 volts). Best for buyers who want a compact, sonically neutral converter that preserves highs and lows when adding an amplifier. Best for car owners seeking reliable integration with factory radios that provide short circuit protection. Caution: Expect compatibility to depend on vehicle wiring and head-unit design.
Skar Audio SKAR2CH-LOC LOC Converter
Designed for compatibility with OEM and aftermarket radios, this LOC handles up to 55 watts (16 volts) input and offers a flat 20 Hz–20 kHz range at all volume levels. Best for users who want a broad, consistent frequency response across volume changes. Choose this if you prioritize broadband performance and straightforward installation. Caution: Ensure your vehicle’s wiring is compatible with the LOC’s input specifications.
NuIth Car Audio Speaker Wire to RCA LOC
This 2-channel high-to-low RCA converter facilitates adding an amplifier or subwoofer to a stock stereo by converting speaker wires to RCA outputs. It includes a gain adjustment to tailor bass response without manual amplifier tweaks. Best for buyers who want straightforward, adjustable control over bass levels and simple two-channel upgrades. Limitation: The description emphasizes bass control, so more complex multi-sub systems may require additional components.
Scosche LOC2SL Line Output Converter
Scosche LOC2SL offers versatile installation with 2-channel high-to-low conversion, ideal for subwoofer amplification and enhanced sound without rewiring. Best for buyers who want seamless integration between factory stereos and aftermarket amps. Caution: While adaptable, true multi-channel systems may require additional adapters for optimal performance.
PNGKNYOCN Car Stereo Hi-Low Converter 2-Channel
The PNGKNYOCN LOC is designed to minimize signal interference while converting speaker-level to RCA line-level signals and supports up to 50 watts input. Best for buyers wanting a balance of straightforward setup and clean sound with compatibility across standard and smart radios. Caution: Verify power handling aligns with your amplifier’s requirements to avoid clipping.
Kicker 46KISLOC K-Series Interconnect
The KISLOC Interconnect is a compact 2-channel speaker-to-RCA converter that delivers up to 8 volts of output on up to 55 watts input. Best for buyers seeking a small footprint with reliable sound quality and straightforward installation. Limitation: Some factory radios may require additional adapters for full compatibility depending on vehicle model.
Buying Guide: Key Purchase Considerations And Comparisons
What should you check before buying a line-out converter?
- Input power handling: Match the LOC’s wattage handling to your factory radio and planned amplifier to avoid distortion.
- Output level: Ensure the converter provides enough RCA output range for your amplifier’s sensitivity.
- Remote turn-on compatibility: If you’re adding an amp, a remote turn-on wire is helpful for automatic on/off control.
- Frequency response: A wider range helps preserve original sound across volumes, especially for bass-heavy setups.
- Installation flexibility: Look for units with broad compatibility with OEM radios and smart radios, and simple wiring.
- Physical footprint: If space is limited under the dash, a compact LOC is advantageous.
Which option fits your system best?
- Best overall sound fidelity: Kicker 46KISLOC2 and Scosche LOC2SL provide clear, low-noise conversion with broad compatibility.
- Best for simple two-channel upgrades: NuIth and PNGKNYOCN offer straightforward, adjustable bass control and easy installation.
- Best for compact space: Kicker 46KISLOC and KISLOC Interconnect provide small footprints without sacrificing output.
Frequently Asked Questions
- What is an LOC and why do I need one?
Answer: A line-out converter translates speaker-level signals from a factory radio into RCA line-level signals for an external amplifier or subwoofer, enabling higher sound quality and more powerful amplification. - Can I use an LOC with any car stereo?
Answer: Most factory radios can work with LOCs, but compatibility depends on wiring, radio design, and power handling limits. Always verify input wattage and wiring requirements. - Do LOCs affect sound quality at low volumes?
Answer: A good LOC preserves signal integrity across volume levels, helping retain highs and lows without introducing noise or hum. - Is remote turn-on necessary?
Answer: It’s helpful for powering an amplifier on/off automatically, reducing parasitic draw and potential pops during startup. - What should I consider for subwoofer integration?
Answer: Look for LOCs offering stable bass response and low-noise performance. Pair with an appropriate amplifier and set gains carefully to avoid distortion. - Are there any installation tips I should follow?
Answer: Keep RCA runs away from power cables to minimize interference, follow vehicle-specific wiring diagrams, and test gradually at low volume before full use.