Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
4.5Editor score
Accepts up to 55 watts input
100 milli-amp remote turn on
Automatic speaker to RCA conversion
In this guide
Adding a subwoofer to your car audio system often requires converting speaker level signals to line level outputs. A quality line out converter subwoofer adapter ensures clean signal transfer without losing fidelity or damaging your factory head unit.
We compared ten top rated models based on signal handling, bass restoration tech, build quality, and ease of installation. Our analysis covers passive and active converters designed for various factory and aftermarket stereo setups.
Each pick highlights key specs, pros, and cons to help you choose the right adapter. Prices and availability change often, so verify details before purchasing to ensure compatibility with your specific vehicle and amp.
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 restores factory bass roll off
Handles up to 400 watts per channel
Integrated mounting brackets included
SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output
4.3Editor score
24K gold plated binding posts
No fidelity loss signal conversion
Premium grade PCB for power
Top 10 Best Line Out Converter Subwoofer in 2026 Compared
This side by side comparison reviews all ten selected converters. We evaluate input handling, output voltage, special features, and overall value to help you find the perfect match for your audio upgrade.
ProductsSpecificationsEditor scorePrice
Best Budget
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
Input up to 55 watts
Remote turn on included
DC offset signal sense
RCA signal output
4.5Editor score
Editor's Choice
CT Sounds CT-LC2 2-Channel Premium Line-Out Converter with BassLift
BassLift technology included
Full range main output
Low pass bass output
34 page manual
4.4Editor score
Editor's Choice
Scosche LOC2SL Line Output Converter with Remote Control Knob – 2CH High/Low RCA Converter Car Audio – Ideal for Subwoofer Amp – Line Level Converter for Car Stereo – Easy Installation – Quality Sound
Remote control knob included
Compact durable design
Lifetime tech support
OEM quality RCA converter
4.4Editor score
Skar Audio SKE2LOC 2-Channel Active Line Output Converter
Selectable turn on options
Adjustable bass control
Frequency response 21Hz 30kHz
Remote level control
4.5Editor score
NuIth Car Audio Speaker Wire to RCA Line Output Converter, 2-Channel High to Low RCA Converter for Adding Amplifier Subwoofer to Stock Stereo
Level gain adjustment
High to low conversion
Clean sound quality
Easy installation
4.4Editor score
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
400W input handling
Onboard load selection
Ground isolation switch
Compact slim chassis
4.7Editor score
Skar Audio SKAR2CH-LOC 2-Channel Speaker Wire to RCA Line-Out Converter
20Hz to 20kHz range
55 watts input max
8 volts RMS output
60 ohm load applied
4.5Editor score
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
AccuBASS technology
Handles 400W per channel
Fixed and variable outputs
Integrated mounting brackets
4.6Editor score
SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output
24K gold plated posts
No fidelity loss
High current PCB
30 dBV attenuation
4.3Editor score
NVX XLCA2 X-Series 2-Channel Line Out Converter Digital Bass Enhancer
400 watts RMS handling
xBOOST technology included
Remote bass knob
Dual amp outputs
4.5Editor score
1. Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output – Best Overall Line Out Converter Subwoofer
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
Speaker to RCA conversion
100 mA remote out
DC offset technology
Up to 55 watts input
The Kicker 46KISLOC2 is a top rated line out converter subwoofer adapter designed for seamless integration with factory radios. With a solid rating, it delivers true sonic accuracy at any volume level while maintaining the original audio quality.
Pros
- Affordable price point
- Includes remote turn on
- Easy installation process
- True sonic accuracy
- Sparkling highs and lows
Cons
- Limited signal input voltage
- No bass boost feature
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Its core strength lies in using factory speaker wires to automatically convert signals into RCA and remote turn on output. This innovative DC offset technology ensures your subwoofer amp activates correctly without complex rewiring or additional switches.
While it handles up to 55 watts effectively, it lacks advanced bass restoration features found in premium models. However, for standard upgrades needing reliable signal conversion and remote control, these trade-offs are minimal and acceptable.
Buyers seeking a straightforward, cost effective way to add a subwoofer to any radio will find this Kicker unit ideal. It remains a highly recommended choice for those prioritizing simplicity and core functionality.
Seamless Signal Conversion
The DC offset method converts speaker signals to RCA without losing audio fidelity or needing external power sources.
Remote Activation Included
A built in 100 milli amp remote wire ensures your amplifier turns on automatically with the factory radio.
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2. CT Sounds CT-LC2 2-Channel Premium Line-Out Converter with BassLift – High Quality Signal Conversion
CT Sounds CT-LC2 2-Channel Premium Line-Out Converter with BassLift
BassLift technology
Full range main output
Low pass bass output
34 page manual
The CT Sounds CT-LC2 offers a premium solution for converting high level signals to RCA inputs. Its standout feature is BassLift technology, which compensates for the bass roll off that often occurs in factory systems at higher volumes.
Pros
- Restores factory bass roll off
- Dual channel outputs
- Detailed installation manual
- Full range main signal
Cons
- Mid range pricing tier
- BassLift may overcorrect
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This unit provides both full range main outputs and dedicated low pass bass outputs, giving installers flexibility in signal routing. The comprehensive 34 page manual guides users through step by step installation, reducing potential errors during setup.
Some users might find the BassLift adjustment tricky without calibration, as it can alter natural sound profiles. Additionally, it costs more than basic converters, but the enhanced bass restoration justifies the expense for audiophiles.
Choose this converter if you want to restore lost low frequencies and need dual channel flexibility. It is a solid choice for those looking to upgrade factory audio without replacing the head unit entirely.
Bass Restoration Tech
BassLift actively compensates for frequency filtering found in stock stereos to deliver deeper bass response.
Dual Signal Outputs
Separate outputs for main speakers and subwoofer allow for optimized signal distribution and amplifier tuning.
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3. Scosche LOC2SL Line Output Converter with Remote Control Knob – 2CH High/Low RCA Converter Car Audio – Ideal for Subwoofer Amp – Line Level Converter for Car Stereo – Easy Installation – Quality Sound – Best Value Line Out Converter Subwoofer
Scosche LOC2SL Line Output Converter with Remote Control Knob – 2CH High/Low RCA Converter Car Audio – Ideal for Subwoofer Amp – Line Level Converter for Car Stereo – Easy Installation – Quality Sound
Remote control knob
Compact durable design
Lifetime tech support
Clean powerful sound
Scosche continues to deliver quality car audio solutions with the LOC2SL. This unit stands out by offering unmatched versatility and seamless integration, ensuring no loss of sound quality when adding an aftermarket amplifier.
Pros
- Remote bass level adjustment
- Highly durable build
- Lifetime technical support
- Minimal signal interference
- Trusted brand reputation
Cons
- Remote knob separate purchase
- Standard gain adjustment
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Its compact and durable design fits easily into tight spaces while maintaining structural integrity. Enhanced audio features deliver crisp and clear sound specifically for subwoofers, appealing to audiophiles seeking high fidelity without complex rewiring.
The main limitation is that remote control knobs are not always included in every bundle, requiring verification before purchase. Yet the lifetime tech support and trusted brand reputation make it a reliable long term upgrade.
Ideal for enthusiasts prioritizing signal quality and support, this converter bridges the gap between factory and aftermarket systems effectively. It provides the stable performance needed for professional sound systems at a reasonable price.
Remote Control Capability
Integrated remote knob allows driver adjustment of bass levels without leaving the seat.
Lifetime Support
Backed by Scosche lifetime tech support ensuring long term assistance for any technical issues.
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4. Skar Audio SKE2LOC 2-Channel Active Line Output Converter – Active Signal Enhancement
Skar Audio SKE2LOC 2-Channel Active Line Output Converter
Active design
Adjustable bass control
DC offset audio sense
Remote level control
Skar Audio offers the SKE2LOC as a robust active line output converter. This device provides fully adjustable bass and main channel control, allowing users to fine tune their audio experience precisely.
Pros
- Full bass frequency response
- Multiple turn on options
- Remote level knob
- Main channel control
Cons
- Requires power source
- Higher price than passive
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Its wide frequency response spans from 21Hz to 30kHz, ensuring no audio detail is lost in the conversion process. Selectable turn on options like DC offset and audio sense offer flexibility to match various factory wiring setups.
Active converters generally require a dedicated power connection which adds a step to installation. However, the benefit of signal boosting and precise control outweighs this minor inconvenience for most users.
This model is perfect for those needing more control over their subwoofer output. It suits advanced setups where adjusting bass response directly from the dashboard is a priority.
Adjustable Bass Control
Fully adjustable controls allow precise tuning of subwoofer output levels to match driver preferences.
Flexible Turn On
Selectable DC offset and audio sense options ensure reliable amplifier activation in diverse vehicles.
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5. NuIth Car Audio Speaker Wire to RCA Line Output Converter, 2-Channel High to Low RCA Converter for Adding Amplifier Subwoofer to Stock Stereo – Easy Install Adapter
NuIth Car Audio Speaker Wire to RCA Line Output Converter, 2-Channel High to Low RCA Converter for Adding Amplifier Subwoofer to Stock Stereo
High to low RCA
Level gain adjustment
Relay turn on
Clean signal quality
The NuIth converter provides a straightforward method for converting speaker wire to RCA outputs. It features a convenient level gain adjustment, allowing users to tweak bass levels without accessing the amplifier manually.
Pros
- Adjustable bass gain
- Relay automatic turn on
- Neat power connection
- Easy to use
Cons
- Basic feature set
- Standard build quality
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Installation is designed to be easy, simply tapping into speaker wires allows the relay to sense the signal and trigger the amplifier. The neat power plug ensures stable bonding and contact reliability during operation.
While it lacks the advanced features of premium models, it fulfills core conversion needs effectively. It is an affordable option for users prioritizing simplicity over complex tuning capabilities.
Best for budget conscious buyers seeking functional signal conversion, this adapter ensures your system receives the necessary low voltage signals. It delivers clean sound and reliable performance for standard subwoofer add-ons.
Level Gain Adjustment
Onboard gain adjustment lets you lower bass output without accessing the amplifier during driving.
Relay Activation
Built in relay automatically detects signal to turn on your subwoofer amplifier when radio plays.
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6. AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver – Signal Boosting Driver
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
Up to 400W input
Onboard load selection
Ground isolation switch
Compact slim chassis
The AudioControl LC1i upgrades your audio system while keeping your factory stereo intact. It converts speaker level signals up to 400W per channel into high quality pre-amp output for downstream devices.
Pros
- Handles 400 watts per channel
- Built in line driver
- Eliminates ground noise
- Seamless integration
Cons
- Requires separate remote knob
- Higher cost
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Its onboard load selection switches allow factory amplifiers in modern vehicles to detect speaker loads correctly. The ground isolation switch effectively eliminates noise like alternator whine or ground buzz from your signal chain.
While it provides excellent signal boosting capabilities, optional remote knobs must be purchased separately. However, its compact chassis and reliable performance make it a top choice for complex factory integrations.
This model is ideal for modern vehicles with factory amps that need load compensation. It delivers high fidelity signals ensuring your aftermarket subwoofers perform at their best.
Load Selection Switches
Onboard switches allow factory amps to detect proper load ensuring correct signal passing in modern cars.
Ground Isolation
Selective ground isolation switch removes electrical noise for clean and silent audio playback.
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7. Skar Audio SKAR2CH-LOC 2-Channel Speaker Wire to RCA Line-Out Converter – Wide Frequency Converter
Skar Audio SKAR2CH-LOC 2-Channel Speaker Wire to RCA Line-Out Converter
Flat frequency range
55 watts input
60 ohm load
8 volts RMS output
Skar Audio presents the SKAR2CH-LOC with a flat 20Hz to 20kHz frequency range. This ensures accurate audio reproduction at all volume levels without coloration or distortion in the conversion process.
Pros
- 20Hz to 20kHz flat response
- 8V RMS output
- Open circuit protection bypass
- Compatible with OEM radios
Cons
- Standard signal path
- No bass boost
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It applies a 60 ohm load to each channel to circumvent open-circuit protection found in some factory amplifiers. This feature prevents issues with signal detection and ensures stable operation across different vehicle systems.
While it lacks active features like remote knobs or bass boost, its solid output voltage and frequency response are reliable. It serves well as a dedicated signal bridge for subwoofer amplifiers.
This converter suits users needing a reliable passive solution with wide frequency compatibility. It is a dependable choice for OEM or aftermarket radio setups requiring stable signal output.
Flat Frequency Range
Delivers consistent 20Hz to 20kHz flat response to maintain audio integrity across all frequencies.
Load Application
60 ohm load applied to prevent open circuit protection errors in factory amplifier detection.
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8. 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 – Premium Factory Integration
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
AccuBASS technology
Up to 400W input
Integrated mounting brackets
Fixed variable outputs
The AudioControl LC2i is widely regarded as a premium line out converter subwoofer adapter for factory integration. It maximizes bass using AccuBASS technology that corrects roll-off when volume increases on the factory radio.
Pros
- AccuBASS restores bass roll off
- Retains factory features
- Compact slim chassis
- Full sound control
Cons
- No fader retention
- Premium pricing
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Its compact chassis with integrated mounting brackets ensures easy installation without taking up extra room. It retains important factory features including volume controls, making it a seamless upgrade for original vehicle setups.
While it does not retain fader control with multiple amps, its overall flexibility is excellent. The fixed and variable outputs allow precise customization of audio levels to match your specific needs.
Buyers prioritizing factory feature retention and bass quality should consider this LC2i model. It represents the gold standard for adding subwoofers without sacrificing original vehicle functionality or sound quality.
AccuBASS Processing
AccuBASS technology corrects and restores bass roll-off caused by factory radio volume increase.
Factory Feature Retention
Retains factory volume and steering wheel controls ensuring no loss of original car convenience.
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9. SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output – High End Adapter
SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output
24K gold plated posts
No fidelity loss
Premium PCB
30 dBV attenuation
The SVS SoundPath adapter is designed for those needing no loss of fidelity in signal conversion. It uses 24K gold-plated binding posts for bare-wire, spade, or banana connectors ensuring secure input connections.
Pros
- High fidelity conversion
- Gold plated binding posts
- High current handling
- Secure RCA connection
Cons
- Designed for home audio
- High cost
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Premium grade resistors and wide-trace PCBs handle high current and extreme power levels. The narrow-tolerance components ensure signal stability and durability even under heavy usage conditions over time.
While primarily marketed for home audio, it serves as a robust adapter for high-end systems. The attenuation ensures it does not draw power from the amplifier, maintaining signal integrity.
Ideal for audiophiles needing a premium bridge for legacy components, this adapter guarantees secure connections. It is the best choice for users prioritizing build quality and signal fidelity above all else.
Gold Plated Posts
24K gold-plated binding posts ensure secure and low resistance connections for speaker inputs.
High Current PCB
Wide-trace PCBs with premium resistors handle high current to ensure extreme power handling stability.
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10. NVX XLCA2 X-Series 2-Channel Line Out Converter Digital Bass Enhancer – Digital Bass Enhancement
NVX XLCA2 X-Series 2-Channel Line Out Converter Digital Bass Enhancer
400 watts RMS
xBOOST technology
Remote bass knob
Digital bass enhancement
The NVX XLCA2 features xBOOST technology to optimize bass response and enhance low-end performance. It converts high-level speaker signals to low-level RCA outputs for use with aftermarket amplifiers seamlessly.
Pros
- Optimizes bass response
- Remote bass control
- Multiple outputs
- Efficient auto-on
Cons
- Digital processing delay
- Specific setup needed
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Included remote bass knob allows direct adjustment from the dashboard while driving. Selectable auto-on ensures efficiency by activating only when the vehicle is in use to save battery power.
It offers versatile output options including dual amplifier outputs and a 12V trigger for complex setups. Users should note that digital processing may introduce minor latency in specific configurations.
For those seeking enhanced bass and flexible outputs, this model stands out in the lineup. It is a powerful tool for enthusiasts needing digital control over their audio system's low end.
xBOOST Technology
xBOOST optimizes system bass response providing deep powerful bass experience with minimal distortion.
Remote Bass Knob
Included remote knob allows convenient control over low-end output directly from the dashboard.
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Buying Guide – How to Choose the Best Line Out Converter Subwoofer
Selecting the right converter requires analyzing input voltage, signal type, and special features. This guide breaks down key factors to help you choose a model that fits your specific vehicle and amplifier needs.
Input Signal Voltage
Ensure the converter can handle the maximum voltage output of your factory radio. Some units handle only 55 watts while others manage up to 400 watts. Exceeding voltage limits can cause distortion or damage to the converter.
Check your vehicle's speaker specs to match the converter's voltage handling capabilities accurately.
Passive vs Active Conversion
Passive converters rely on voltage drop to signal RCA levels and do not need external power. Active units use internal circuitry to boost signals and often provide better fidelity and bass control.
Active models are recommended if your factory signal is weak or you need precise signal control.
Bass Restoration Technology
Many factory radios cut bass frequencies as volume increases to prevent speaker distortion. Converters with AccuBASS or BassLift compensate for this roll-off to maintain consistent sound at high volumes.
Choose a model with bass restoration if you notice reduced low-end performance at higher volumes.
Remote Turn On Capability
A remote turn-on output sends a trigger signal to your amplifier when the radio is active. Look for units that generate this signal automatically without needing an additional wire harness.
This feature simplifies wiring and ensures your subwoofer turns on only when the audio system is running.
Build Quality and Durability
Look for sturdy chassis materials and robust internal components like gold-plated connectors. High quality PCBs ensure clean signal transmission and reduce interference or noise during operation.
Investing in durable hardware protects your investment and ensures stable long term performance.
Output Options and Channels
Converters come with single or dual channel outputs depending on your subwoofer setup. Multi-channel units allow you to connect multiple amplifiers or process signals independently for better control.
Confirm the number of RCA outputs matches your amplifier's input requirements before purchasing.
Adjustability and Control
Units with onboard gain or bass knobs provide flexibility to tune your sound without accessing the amp. Some models even include dash-mounted remotes for real-time adjustments while driving.
Adjustable features are vital if you need fine-tuning capabilities for different music genres or settings.
Vehicle Compatibility
Some converters include load selection switches to bypass factory amplifier detection systems. Modern cars with built-in amps may need specific converters to prevent warning lights or system malfunctions.
Verify that the converter is designed for your specific vehicle year and audio configuration.
How to Use and Care for Your Line Out Converter Subwoofer
Begin by locating your factory speaker wires behind the head unit or at the door panels. Ensure the engine is off and disconnect the negative battery terminal before touching any wires to prevent shorts.
Connect the input wires of the converter to the speaker wires following the polarity markings. Secure all connections with crimp connectors or soldering to ensure stable contact and prevent signal loss over time.
Mount the converter securely in a dry area away from moisture or heat sources. Route RCA cables and power wires away from high voltage lines to minimize interference or noise during playback.
Frequently Asked Questions
Do I need a line out converter for my aftermarket stereo?
No, aftermarket head units usually come with built-in RCA preamp outputs. A converter is typically needed when retaining a factory radio that only sends speaker level signals to the subwoofer amplifier.
What is the difference between passive and active converters?
Passive converters use voltage drop from speaker wires to create RCA signals without external power. Active converters use internal circuitry to boost signals and often provide better fidelity and bass control options.
Can a line out converter damage my factory radio?
A properly rated converter will not damage your radio. Always check voltage handling specs and ensure compatibility with your specific vehicle model to prevent electrical issues.
How do I know if my car needs load compensation?
If your factory system has built-in amplifiers it may need load compensation. Converters with onboard load switches allow the factory amp to detect speaker load and prevent system errors.
Can I use a converter with digital factory audio systems?
Digital systems may require special bypass solutions or processors. Traditional converters work with analog outputs so verify your factory system type before buying to ensure compatibility.
Why does my subwoofer not turn on with the radio?
This often happens if the remote wire is not connected properly. Use a converter with automatic turn-on capability to trigger the amplifier via the speaker signal or external relay.
What tools are needed for installation?
Basic tools include wire strippers crimpers and screwdrivers. You may also need a trim kit to access wires behind the head unit depending on your vehicle's dashboard design.
Is grounding important for line out converters?
Yes proper grounding prevents noise and ensures signal stability. Connect the ground wire to a clean metal surface on the chassis and consider using a ground isolation switch if noise persists.
Final Thoughts on Choosing the Best Line Out Converter Subwoofer
This guide highlights ten top models ranging from budget options to high-end premium converters. Whether you need simple signal conversion or advanced bass restoration there is a match for your specific setup.
Prioritize features like input voltage handling and remote turn-on capability to ensure seamless integration. Selecting the right converter ensures your factory head unit communicates perfectly with your subwoofer amplifier.
Always verify compatibility and check current prices before purchasing. Your audio upgrade journey starts with the right adapter so choose wisely for the best listening experience.