Best Speaker Line Output Converters for Car Audio Upgrades
Answering the need to add amplifiers or subs to a factory or aftermarket stereo, these line output converters transform speaker-level signals into clean, RCA-level outputs. This guide highlights five top options suited for DIY installers, audiophiles seeking clarity, and those expanding a car audio system without wiring a new head unit. Each pick is evaluated for compatibility, ease of installation, and sound consistency across volume ranges. Use this overview to choose a converter that suits your vehicle and amplification goals.
Product Comparison at a Glance
| Product | Best For | Key Benefit | Approx. Input |
|---|---|---|---|
| KICKER 46KISLOC2 | High-fidelity sound with factory wiring | Automatic DC offset conversion to RCA and remote turn-on | Up to 55W |
| Skar Audio SKAR2CH-LOC | OEM and smart radios users | Flat 20Hz–20kHz range at all levels | Up to 55W |
| NuIth Car Audio | Budget-friendly 2-channel upgrade | Level gain adjustment for bass control | General; 2-channel |
| Scosche LOC80 | Flexible installation for various cars | Versatile high/low conversion for subwoofers | General |
| CT Sounds CT-LC2 | Bass-focused factory-to-aftermarket upgrades | BassLift technology for bass restoration | 2-channel |
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter
The KISLOC2 converts a factory speaker signal into both RCA outputs and a 12-volt remote wiring, enabling an amplifier to pair with nearly any radio. It is best for enthusiasts who want true sonic accuracy at varying volume levels and a straightforward installation that uses existing speaker wires. Designed to handle up to 55 watts (16 volts) of input, this converter suits mid-range audio builds and drivers seeking clean highs and deep lows.
Best for: Vehicle owners upgrading with a separate amplifier who value precise tonal balance. Why selected: Direct DC offset handling and a robust remote output simplify integration with many amplifiers.
Caution: Ensure your head unit’s output remains within the 55W input limit to avoid distortion or overheating.
Skar Audio SKAR2CH-LOC 2-Channel LOC
The SKAR2CH-LOC is compatible with OEM and aftermarket radios, including smart radios, and accepts up to 55 watts. It features a flat 20Hz–20kHz response across volume levels, making it a solid pick for users who want clear, full-range performance when adding an amplifier or subwoofer. It’s particularly suitable for installations where maintaining audio fidelity across a wide frequency spectrum is critical.
Best for: Builders needing broad-frequency fidelity with flexible radio compatibility. Why selected: Consistent high-to-low conversion across various power inputs helps preserve sound quality in diverse setups.
Limitation: Real-world performance depends on the rest of the system and head unit capability to drive the converter at the required levels.
NuIth Car Audio 2-Channel LOC
The NuIth converter focuses on 2-channel upgrading, converting speaker-level outputs to RCA outputs with adjustable level gain for bass control. It’s a practical option for those who want an affordable, adaptable solution when mounting a separate amplifier or subwoofer to a factory or aftermarket stereo. The product emphasizes ease of use with gain adjustments to tune bass without stopping on the roadside.
Best for: Budget-conscious installers adding a 2-channel amp or sub. Why selected: Level gain control helps tailor bass response without extra tools or removal of the head unit.
Limitation: The feature set is basic; high-end bass tuning may require additional processing or a more advanced converter.
Scosche LOC80 Line Output Converter
The Scosche LOC80 is a versatile line output converter designed to integrate factory stereos with aftermarket amplifiers. It excels in applications requiring a robust high-to-low conversion, making it a reliable choice for boosting a car’s audio performance without complex rewiring. It’s well-suited for subwoofer setups and compatibility with a wide range of car audio systems.
Best for: Installers seeking flexible installation paths with strong compatibility. Why selected: Its adaptable design supports many vehicle configurations and amplifier types.
Caution: Extended use with high-power inputs should be monitored to prevent overheating or signal noise in some installations.
PNGKNYOCN Car Stereo Hi-Low Converter
The PNGKNYOCN Hi-Low Converter is designed to convert speaker-level signals to RCA line-level outputs for adding amplifiers or a subwoofer to stock stereos. It emphasizes signal integrity by minimising interference and hum. It accepts input signals up to 50 watts (12 volts) and is compatible with standard and most smart radios, making it suitable for many common vehicle setups.
Best for: System builders seeking clean signal transfer with standard radios. Why selected: Noise minimization and wide compatibility support reliable upgrades.
Limitation: Power handling is capped at 50W, which may not suffice for high-power systems without additional components.
AudioControl LC2i 2-Channel with AccuBASS
The LC2i converts speaker-level signals up to 400W per channel into high-quality pre-amp outputs for aftermarket subs, amplifiers, and processors. AccuBASS processing enhances bass by correcting for factory bass roll-off as volume increases. Its slim chassis supports quick installation in tight spaces, making it a strong choice for bass-forward upgrades in compact vehicles.
Best for: Users prioritizing strong bass accuracy and processor-ready outputs. Why selected: AccuBASS helps maintain bass presence when the factory system limits low-end response.
Caution: Powerful outputs require careful matching with the downstream amplifiers to avoid overloading or distortion.
Buying Guide: Choosing The Right Speaker Line Output Converter
- Power handling: Match the converter’s input rating to your head unit’s output and the amplifier’s requirements. Exceeding ratings can cause distortion or damage.
- Frequency response: If you plan to drive a subwoofer, prefer converters with stable low-frequency outputs (20Hz and up) to preserve bass.
- Compatibility: Ensure the converter supports your radio type (OEM, aftermarket, or smart radios) and your vehicle’s wiring configuration.
- Output options: Look for RCA outputs with remote turn-on, and whether you need single- or two-channel conversion to match your amplifier setup.
- Installation space: Slim chassis and mounting brackets simplify installation in tight dashboards or glove compartments.
- Noise and interference: Seek models that minimize signal interference and hum, especially when upgrading with aftermarket amps.
Frequently Asked Questions
- What is a speaker line output converter used for?
It converts speaker-level signals from a factory or aftermarket radio into RCA line-level signals to drive external amplifiers or subwoofers.
- Do I need a bass-boost feature?
If you want to restore factory bass roll-off and maintain strong low-end response, a converter with BassLift or AccuBASS can help.
- How many channels should I choose?
Choose based on your amplifier: a two-channel converter for a single stereo amp or sub, or a two-channel to multi-channel if you plan multiple outputs.
- Can I install this myself?
Yes, most line output converters are designed for DIY installs, but follow vehicle-specific wiring guides and safety precautions.
- Will higher wattage converters sound better?
Not necessarily; sound quality depends on the entire system, including the head unit, amplifier, and speaker setup. Choose appropriate wattage for your gear.
- Are these converters compatible with smart radios?
Many models list compatibility with standard, OEM, and smart radios, but confirm specific compatibility in product details before buying.