Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
4.5Editor score
Automatic speaker signal conversion
100 milli-amp remote output
Up to 55 watts input
In this guide
Upgrading your car audio system often requires adding a subwoofer to deepen the bass response. A line out converter subwoofer adapter bridges the gap between factory stereos and aftermarket amplifiers. It ensures your new components receive the correct signal levels without distortion.
We evaluated ten top-rated converters based on signal fidelity, build quality, and ease of installation. Each product was assessed for its ability to handle high-level inputs and deliver clean RCA outputs. Our goal is to help you find the perfect match for your vehicle.
Every pick in this list highlights specific strengths like remote controls or bass restoration. While prices fluctuate over time, the performance characteristics remain consistent. Check the current listings for the most up-to-date availability and offers before you buy.
Top 3 Picks for Best Line Out Converter Subwoofer
AudioControl LC2i 2-Channel Line Output Converter with AccuBASS for Adding Subwoofers, Amplifiers to Factory Car Audio Receiver Head Unit, Speaker Level to RCA Line Level Converter
4.6Editor score
AccuBASS processing technology
Up to 400W per channel
Compact slim chassis design
SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output
4.3Editor score
24K gold-plated binding posts
No loss of fidelity
Premium grade PCBs
Top 10 Best Line Out Converter Subwoofer in 2026 Compared
This side-by-side comparison examines ten leading line out converters for subwoofers. We look at their input capabilities, output signals, and special features to help you decide.
ProductsSpecificationsEditor scorePrice
Best Budget
Kicker 46KISLOC2
55 watts input signal
Remote turn-on output
RCA signal conversion
Compact installation size
4.5Editor score
Editor's Choice
CT Sounds CT-LC2
BassLift technology
2-channel premium converter
Low-pass bass output
34-page manual included
4.4Editor score
Best Premium
Scosche LOC2SL
Remote control knob
High to low converter
Lifetime tech support
OEM quality RCA
4.4Editor score
Skar Audio SKE2LOC
2-channel active converter
Adjustable bass control
30kHz frequency response
Remote level control
4.5Editor score
NuIth Car Audio
Level gain adjustment
Easy relay installation
Clean sound output
Compact power plug
4.4Editor score
AudioControl LC1i
400W per channel
Load selection switches
Ground isolation switch
Slim chassis design
4.7Editor score
Skar Audio SKAR2CH-LOC
55 watts input
20Hz to 20kHz
60-ohm load
8 volts RMS output
4.5Editor score
AudioControl LC2i
AccuBASS processing
400W per channel
Integrated mounting brackets
Remote control input
4.6Editor score
SVS SoundPath
Gold-plated binding posts
No fidelity loss
High-current PCBs
-30 dBV attenuation
4.3Editor score
NVX XLCA2
400 watts RMS
xBOOST technology
Selectable auto-on
Remote bass knob
4.5Editor score
1. Kicker 46KISLOC2 – Best Value for Money
Kicker 46KISLOC2
55 watts input signal
100mA remote output
RCA signal conversion
DC offset technology
The Kicker 46KISLOC2 is a reliable and budget-friendly line out converter subwoofer solution for most users. With a strong rating, it proves to be a top choice for upgrading factory systems without breaking the bank. Its straightforward design makes it accessible for beginners.
Pros
- Affordable price point
- Includes remote turn-on
- Simple wiring process
- Trusted brand quality
Cons
- No bass adjustment
- Basic feature set
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This converter excels at converting speaker signals into RCA outputs using DC offset technology. It automatically generates a remote turn-on wire, which eliminates the need for a separate tap. The build quality ensures durability for long-term use in any vehicle.
While it lacks advanced bass controls, its core function of signal conversion is robust and clear. Users appreciate the ease of integration with existing wiring harnesses. The price remains competitive compared to other options in this specific category.
Ideal for those seeking a simple upgrade, this model delivers excellent performance for its cost. If you need a no-fuss connector to add a subwoofer, it is a highly recommended pick. Always verify compatibility with your specific car model before installation.
Automatic Remote Turn-On
This feature saves time by generating a trigger wire automatically from the speaker signal.
DC Offset Technology
It ensures stable conversion without needing external power sources for activation.
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2. CT Sounds CT-LC2 – Bass Restoration Feature
CT Sounds CT-LC2
BassLift technology
Full-range main output
Low-pass bass output
34-page manual
The CT Sounds CT-LC2 is designed for users who need to restore bass lost in factory systems. Its BassLift technology compensates for roll-off, ensuring your subwoofer gets the right signal. This makes it a standout for audio enthusiasts.
Pros
- Restores factory bass roll-off
- Includes detailed manual
- Separate subwoofer output
- Premium build quality
Cons
- Higher price point
- May need extra tools
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It offers both a main output for speakers and a dedicated low-pass output for subwoofers. This separation allows for more precise tuning of your audio system. The included manual provides step-by-step instructions to simplify the setup process.
The price is higher than basic units, but the added functionality justifies the cost for many. It is perfect for those dealing with modern cars that limit low frequencies at higher volumes. Installation is straightforward with the provided guide.
If you want to maximize bass performance without changing your factory radio, this is a great choice. The separate outputs give you flexibility that standard converters lack. Verify your system needs before purchasing to ensure a good fit.
BassLift Technology
This feature restores low-frequency response that fades as volume increases in factory radios.
Dual Output Design
It provides distinct channels for speakers and subs to optimize sound quality.
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3. Scosche LOC2SL – Remote Control Convenience
Scosche LOC2SL
Remote control knob
High to low converter
Lifetime tech support
Compact durable design
The Scosche LOC2SL stands out because it includes a remote control knob for adjusting bass. This allows you to tweak levels from the driver's seat without stopping the car. It is a practical feature for daily drivers who want flexibility.
Pros
- Includes remote control knob
- Easy to install
- Lifetime tech support
- OEM quality RCA
Cons
- Cable length varies
- Bass only control
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It integrates your factory stereo with an aftermarket amplifier seamlessly. The conversion ensures no loss of sound quality, delivering crisp and clear audio. The compact design fits easily into tight spaces behind dash panels or consoles.
Backed by a lifetime tech support and limited warranty, Scosche offers reliability. The RCA converter is designed to minimize interference, ensuring clean sound delivery. This model is trusted by many for its consistent performance over time.
Ideal for those who need easy bass adjustment, this unit provides convenience and quality. The remote knob makes it a favorite for users with complex setups. Always check the included cable lengths to ensure they reach your desired mounting spot.
Remote Control Knob
Allows quick bass adjustments from the dashboard without needing to access the amp.
Lifetime Support
Provides peace of mind with dedicated assistance for any installation issues.
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4. Skar Audio SKE2LOC – Active Control Options
Skar Audio SKE2LOC
2-channel active converter
Selectable turn-on options
Adjustable bass control
Remote level control
The Skar Audio SKE2LOC is an active line out converter subwoofer that offers extensive control. It features selectable turn-on options including DC offset and audio sense for flexibility. This makes it suitable for various vehicle electrical systems.
Pros
- Multiple turn-on options
- Adjustable bass and main
- Wide frequency response
- Includes remote wire
Cons
- Complex for beginners
- Needs power source
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With fully adjustable bass and main channel control, you can tune the sound to your liking. The frequency response covers 21Hz to 30kHz, ensuring accurate audio reproduction. It includes a remote level control for convenient adjustments while driving.
While it is more feature-rich than passive units, it requires a bit more setup. You may need to connect it to a power source carefully to avoid issues. However, the control it provides is valuable for audiophiles.
Best for users who want to fine-tune their subwoofer output, this model is versatile. The ability to adjust both bass and main channels adds depth to your system. Review the wiring diagram carefully to ensure a smooth installation process.
Adjustable Controls
Provides knobs for tuning bass and main levels to match your specific needs.
Wide Frequency Range
Ensures both deep bass and clear highs are transmitted without distortion.
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5. NuIth Car Audio – Simple Level Adjustment
NuIth Car Audio
Level gain adjustment
Easy relay installation
Clean sound output
Compact power plug
The NuIth Car Audio converter is a simple and effective solution for adding a subwoofer. It converts high voltage speaker signals to low voltage RCA signals efficiently. The level gain adjustment helps balance the bass without needing to access the amp.
Pros
- Level gain adjustment
- Easy relay activation
- Clean sound output
- Affordable price
Cons
- Basic build materials
- Limited documentation
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It features a neat power plug with good bonding for stable contact. The relay system senses the signal and turns on the amplifier automatically. This makes the installation process quick and convenient for many users.
While it is an affordable option, it still delivers clean and excellent sound. The compact design allows it to fit into tight spaces without hassle. It is a solid choice for basic setups where budget is a concern.
Ideal for entry-level upgrades, this adapter provides essential functionality at a low cost. The level adjustment is a key feature for balancing your system. Always test the connection before finalizing the wiring to ensure proper signal flow.
Level Gain Adjustment
Lets you adjust the bass level directly on the converter for balanced sound.
Relay Activation
Automatically turns on the amp when music is playing for convenience.
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6. AudioControl LC1i – Best All-Rounder Performance
AudioControl LC1i
400W per channel
Load selection switches
Ground isolation switch
Slim chassis design
The AudioControl LC1i is a top-tier line out converter subwoofer adapter for serious audio fans. It handles up to 400W per channel, ensuring no distortion even at high volumes. The onboard load selection switches help detect factory amplifiers correctly.
Pros
- High power handling
- Load selection switches
- Ground isolation feature
- Premium build quality
Cons
- Higher price
- Requires specific installation
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Its line driver boosts weak factory signals to optimum levels for downstream amps. The ground isolation switch helps eliminate alternator whine and buzz for cleaner sound. The slim chassis design saves valuable space in the vehicle.
Although it is pricier than average, the performance and features justify the investment. The ability to retain factory systems while upgrading is a huge plus. It is built to last with high-quality components that ensure reliability.
Ideal for those wanting the best signal quality and flexibility, this is a superior choice. The features address common issues like noise and signal loss effectively. Follow the installation guide to maximize its benefits for your setup.
Load Selection Switches
Allows detection of factory amplifiers to maintain proper speaker load.
Ground Isolation
Removes noise and interference for a clean and clear audio output.
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7. Skar Audio SKAR2CH-LOC – Reliable Compatibility
Skar Audio SKAR2CH-LOC
55 watts input
20Hz to 20kHz
60-ohm load
8 volts RMS output
The Skar Audio SKAR2CH-LOC is a reliable converter compatible with OEM and aftermarket radios. It accepts up to 55 watts of input signal, handling most factory outputs. The flat frequency range ensures accurate sound at all volume levels.
Pros
- Compatible with OEM radios
- Flat frequency range
- Open-circuit protection
- High voltage output
Cons
- Basic functionality
- No remote included
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It applies a 60-ohm load to each channel to prevent open-circuit protection issues. This feature keeps your vehicle's system stable and avoids warning lights. The RCA outputs provide up to 8 volts RMS for strong signal drive.
This unit is a solid choice for those who want simple and reliable performance. It does not have fancy extras, but it does its job well. The build is robust enough for daily use in any climate.
Ideal for standard upgrades without complex needs, it offers consistent results. The protection features make it a safe bet for modern car electronics. Check your car's requirements to ensure this simple converter meets your needs.
Open-Circuit Protection
Maintains a load to prevent modern vehicle systems from shutting down audio.
Flat Frequency Range
Delivers accurate sound from low bass to high treble without distortion.
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8. AudioControl LC2i – Advanced Bass Processing
AudioControl LC2i
AccuBASS processing
400W per channel
Integrated mounting brackets
Remote control input
The AudioControl LC2i is a premium line out converter subwoofer adapter for high-end setups. Its AccuBASS technology corrects bass roll-off when factory volume increases. This ensures deep bass remains consistent regardless of how loud you play.
Pros
- AccuBASS correction
- High power handling
- Integrated mounting brackets
- Premium features
Cons
- Expensive
- Overkill for simple systems
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It handles up to 400W per channel and includes integrated mounting brackets for easy install. You can retain factory volume controls and steering wheel controls with ease. The optional remote input lets you control subwoofer levels from the dash.
While it is expensive, the feature set is unmatched for factory retention and sound quality. It is built for enthusiasts who want the best possible performance without sacrificing OEM features. The compact chassis saves space and looks clean.
Ideal for complex systems where retention is key, this converter is a top-tier tool. The AccuBASS feature is a game-changer for factory radio users. Ensure you need these specific features before purchasing to justify the cost.
AccuBASS Technology
Restores bass response that drops as volume increases to keep sound full.
Factory Control Retention
Allows you to keep using steering wheel and dashboard controls safely.
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9. SVS SoundPath – Premium Home Audio Adapter
SVS SoundPath
Gold-plated binding posts
No fidelity loss
High-current PCBs
-30 dBV attenuation
The SVS SoundPath is designed to convert speaker level outputs to line level RCA with no loss of fidelity. It is a perfect solution for adding a subwoofer to legacy integrated amplifiers and components. The build quality is exceptional for audio purists.
Pros
- Gold-plated binding posts
- No loss of fidelity
- High power handling
- Narrow-tolerance resistors
Cons
- Home audio focus
- Requires careful setup
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Input and output connections feature 24K gold-plated binding posts and jacks for secure links. It uses premium grade narrow-tolerance resistors and wide-trace PCBs for extreme power handling. The attenuation ensures it does not draw power from the loudspeaker amplifier.
Although it is often used for home audio, it can work in car systems needing high quality. The construction minimizes signal loss and ensures a clean path to your sub. It is an investment in high-fidelity sound reproduction.
Ideal for those who prioritize signal purity above all else, this adapter is top notch. The gold connections and resistors ensure longevity and minimal noise. Check your specific needs to see if this home-focused tool fits your car setup.
Gold-Plated Posts
Ensures secure and corrosion-resistant connections for long-term signal quality.
Power Handling
Supports high current and power levels without distortion or heat issues.
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10. NVX XLCA2 – Digital Bass Enhancement
NVX XLCA2
400 watts RMS
xBOOST technology
Selectable auto-on
Remote bass knob
The NVX XLCA2 is a 2-channel line out converter subwoofer designed to improve your car's audio system. It converts high-level speaker signals to low-level RCA signals for aftermarket amplifiers. The xBOOST technology optimizes bass response for a deep low-end.
Pros
- xBOOST technology
- Remote bass knob included
- High power handling
- Flexible output options
Cons
- Complex wiring
- Digital features vary
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It handles up to 400 watts RMS and features selectable auto-on for efficiency. The included remote bass knob allows you to adjust levels directly from the dashboard. Versatile output options include a 9.5V pre-out and 12V trigger out.
This unit offers flexible installation for complex setups needing digital enhancement. It saves battery power by activating only when the vehicle is in use. The dual amplifier outputs add utility for multi-component systems.
Ideal for those seeking digital bass enhancement, this model provides strong performance. The remote control adds convenience for on-the-fly adjustments. Verify your car's power needs to ensure the unit matches your amplifier requirements.
xBOOST Technology
Optimizes bass response to provide a deep and powerful experience with less distortion.
Selectable Auto-On
Engages the converter only when needed to save battery power efficiently.
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Buying Guide – How to Choose the Best Line Out Converter Subwoofer
Choosing the right line out converter subwoofer adapter requires considering several factors. This guide explains what to look for to ensure compatibility and performance.
Signal Input Capacity
Ensure the converter can handle the voltage and wattage of your factory speaker output. Most handle around 55 watts, but some go up to 400 watts.
Look for specs listing maximum input watts to avoid damaging the unit.
Remote Turn-On Output
A good converter should generate a remote turn-on signal for your amplifier. This allows the amp to switch on when the radio is playing without extra wiring.
Check if the unit includes a dedicated remote wire output for your system.
Bass Adjustment Features
Some units include knobs or digital controls to adjust bass levels from the car. This is useful if your factory radio lacks dedicated subwoofer controls.
Prioritize models with remote knobs if you want easy access while driving.
Factory Radio Compatibility
Modern cars often have factory amplifiers or digital signal processing. Ensure the converter supports load detection to keep these systems working.
Check for load switches or GTO features if you have a complex factory setup.
Build Quality and Design
Look for durable materials that can withstand heat and vibration in a car. Compact designs are easier to hide behind dashboards or seats.
Choose models with proper insulation to prevent noise and interference.
Installation Ease
Simple wiring diagrams and plug-and-play features save time during installation. Some kits include manuals that explain step-by-step connections clearly.
Verify the included connectors match your existing wires or have adapters.
Brand Support and Warranty
Select brands with good reputations for support and warranty coverage. Lifetime tech support can be invaluable if you encounter setup issues.
Check warranty terms to ensure protection against defects or failures.
Frequency Response Range
A flat frequency response ensures accurate audio from bass to treble. Look for models covering 20Hz to 20kHz for full sound quality.
Avoid units with limited bandwidth that might muffle high or low tones.
How to Use and Care for Your Line Out Converter Subwoofer
Install the converter close to the factory radio or stereo harness to minimize wire length. Connect speaker wires to the input terminals and RCA cables to the output ports securely.
Test the connection with the vehicle running to ensure the amplifier turns on with music. Use a multimeter to verify voltage levels if needed for safety.
Secure the unit with the included brackets or zip ties to prevent movement and heat damage. Keep it away from moving parts and direct sunlight for longevity.
Frequently Asked Questions
What does a line out converter subwoofer actually do?
It converts high-level speaker signals from a factory radio into low-level RCA signals. This allows you to connect aftermarket amplifiers and subwoofers without replacing your head unit.
Do I need a separate remote wire for my amp?
Not always. Many converters generate a remote turn-on signal automatically. This wire signals the amp to turn on when the radio is active, saving you from tapping into ignition power.
Will installing a converter damage my factory radio?
No, a proper line out converter is designed to work safely with factory systems. It matches the impedance and voltage to prevent any harm to your stereo components.
Can I use this with modern cars that have factory amps?
Yes, but check for load retention features. Some units have switches to detect factory amps and keep them functioning while still providing an RCA signal.
How do I know which RCA output to use?
Use the subwoofer or low-pass output if your amp has separate channels. This gives you a dedicated signal for bass without interference from the main speakers.
Does the converter affect sound quality?
A high-quality converter should not affect sound quality negatively. Look for units with good isolation and shielding to prevent noise or hiss in your audio.
Final Thoughts on Choosing the Best Line Out Converter Subwoofer
We reviewed ten top line out converter subwoofer options for 2026. Our top picks include the Kicker 46KISLOC2 for budget, the AudioControl LC2i for premium, and the Scosche LOC2SL for convenience.
Prioritize compatibility with your vehicle's electrical system and factory features. Look for units that offer remote turn-on and bass adjustment for the best user experience.
Remember that prices and availability can change. Check current listings for the most up-to-date offers before finalizing your purchase today.