Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
4.5Editor score
Converts speaker to RCA signal
Includes remote turn-on output
Supports up to 55 watts input
In this guide
Adding a subwoofer to your factory car audio system often requires a line out converter to bridge the gap between speaker-level signals and amplifier inputs. Without one, you risk poor sound quality or system incompatibility that limits your bass response and overall listening experience significantly.
We evaluated ten top-rated converters based on signal fidelity, remote turn-on capabilities, build quality, and user feedback to help you find the right match for your vehicle. Each product was assessed for its ability to handle factory signals without distortion while maintaining clean output for aftermarket amplifiers and subwoofers.
Every pick highlights specific strengths like bass restoration, compact design, or advanced gain control to suit different budgets and installation needs. Please note that availability and pricing fluctuate regularly on Amazon, so check the current listings before making your final purchase decision today.
Top 3 Picks for Best Line Out Converter Subwoofer
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
4.7Editor score
Handles up to 400 watts per channel
Built-in line driver for strong signal
Selectable ground isolation switch included
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
Fixed and variable output controls
Compatible with factory volume controls
Top 10 Best Line Out Converter Subwoofer in 2026 Compared
The following table provides a side-by-side overview of all ten selected line out converters, detailing their core specifications and key features to help you compare performance capabilities at a glance before selecting the ideal unit for your specific vehicle audio upgrade project.
ProductsSpecificationsEditor scorePrice
Best Budget
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
Input signal 55 watts
Remote turn-on output included
Passive speaker conversion
4.5Editor score
Editor's Choice
CT Sounds CT-LC2 2-Channel Premium Line-Out Converter with BassLift
2-channel premium design
BassLift technology included
Full-range and bass outputs
4.4Editor score
Best Premium
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 level control knob
Compact durable design
OEM quality RCA converter
4.4Editor score
Skar Audio SKE2LOC 2-Channel Active Line Output Converter
Active line output
Adjustable bass control
Turn-on options selectable
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
Easy install wiring adapter
Clean sound output
4.4Editor score
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
Up to 400 watts input
Ground isolation switch
Remote out trigger included
4.7Editor score
Skar Audio SKAR2CH-LOC 2-Channel Speaker Wire to RCA Line-Out Converter
Flat frequency response
60-ohm load applied
Up to 8 volts output
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 processing
Fixed variable outputs
Factory volume controls retained
4.6Editor score
SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output
Home audio adapter
Gold-plated connectors
-30 dBV attenuation
4.3Editor score
NVX XLCA2 X-Series 2-Channel Line Out Converter Digital Bass Enhancer
xBOOST technology
Auto-on feature
Remote bass control
4.5Editor score
1. Kicker 46KISLOC2 – Best Budget Line Out Converter
Kicker 46KISLOC2
Supports 55 watts input
Remote turn-on output
Passive speaker conversion
The Kicker 46KISLOC2 is a straightforward line out converter designed to turn high level speaker outputs into clean RCA signals for subwoofer amplifiers. It holds a solid 4.5 rating from users who appreciate its plug-and-play simplicity and dependability in daily driving scenarios.
Pros
- Affordable price point
- Reliable Kicker brand
- Simple wiring setup
- Remote wire included
- Compact form factor
Cons
- No level adjustment
- Limited high-end control
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This unit stands out because it provides a remote turn-on output generated by the speaker signal, eliminating the need to hunt for a separate turn-on wire. The conversion process uses DC offset to ensure that you get a powerful 100 milli-amp 12-volt remote signal without extra components.
While it lacks level adjustment knobs found on more complex units, this converter ensures that you get faithful sonic accuracy at any volume level. The lack of active controls means fewer things to break and a lower price that fits tight budgets without sacrificing core performance.
Buyers looking for a reliable budget solution to add an amp to a factory radio will find this converter excellent for quick installs. It is particularly well suited for those who want consistent bass performance without needing to dial in gain settings manually during the drive.
Simple Turn-On Feature
The remote turn-on output simplifies wiring significantly by removing the need for a dedicated ignition wire connection.
Sonic Accuracy
Listeners experience true bass response with all the highs and lows of your original audio preserved during conversion.
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2. CT Sounds CT-LC2 – Strong Premium Converter
CT Sounds CT-LC2
2-channel premium design
BassLift technology included
Full-range and bass outputs
The CT Sounds CT-LC2 is a premium line out converter that focuses on restoring bass depth that factory systems often lose at higher volumes. It comes with a 4.4 rating and is praised for its ability to deliver a full-range signal while isolating bass frequencies for the subwoofer.
Pros
- BassLift restores roll-off
- High-quality build
- Separate bass output
- Detailed manual provided
- Easy installation guide
Cons
- Slightly higher price
- BassLift specific features
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This unit features BassLift technology which compensates for factory bass roll-off ensuring that your low end remains punchy even when the volume is up. It converts high-level speaker signals into low-level RCA inputs efficiently and includes separate outputs for main speakers and the bass channel.
The included manual offers step-by-step instructions that make installation accessible even for those less experienced with car audio wiring. While it costs more than basic passive units, the ability to maintain sound quality across the frequency range makes it a strong value for discerning users.
Choose this converter if you need reliable performance and specific bass enhancement features in your car audio setup. It works well for systems where factory roll-off might otherwise limit the impact of a new subwoofer amplifier.
BassLift Technology
This proprietary feature actively restores low frequency response that tends to diminish as factory radio volume increases.
Output Options
You receive both full-range main outputs and dedicated low-pass bass outputs for flexible system configurations.
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3. Scosche LOC2SL – Convenient Remote Level Control
Scosche LOC2SL
Remote level control knob
Compact durable design
OEM quality RCA converter
The Scosche LOC2SL is a high-level to low-level converter that stands out for its inclusion of a remote control knob for adjusting subwoofer gain on the fly. With a 4.4 rating it offers a balanced blend of ease of use and high-fidelity sound quality for audiophiles.
Pros
- Remote gain knob included
- Lifetime tech support
- Seamless integration
- Compact fit
- Trusted brand
Cons
- Remote requires mounting
- Standard passive unit
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This device allows you to transform your factory stereo into an aftermarket amplifier ready setup without losing sound quality. The remote knob means you can tweak bass levels while driving without having to access the amplifier manually which adds significant convenience to daily use.
Its compact and durable design ensures it fits into tight spaces under a seat or dash while maintaining OEM quality reliability. Backed by Scosche's lifetime tech support and limited warranty users can feel confident in the longevity of this upgrade.
Ideal for those who want flexible control over their subwoofer output without installing a complex processor this converter is a strong pick. It bridges the gap between factory radios and powerful amps with minimal hassle and clean signal transfer.
Remote Adjustment
The included control knob lets you adjust bass levels directly from the dashboard for real-time tuning.
Seamless Integration
This unit ensures no loss of sound quality when moving from factory speaker wire to amplifier RCA inputs.
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4. Skar Audio SKE2LOC – Versatile Active Design
Skar Audio SKE2LOC
Active line output
Adjustable bass control
Turn-on options selectable
The Skar Audio SKE2LOC is an active line output converter that offers flexible turn-on options including DC offset signal sense and remote 12V output. It holds a 4.5 rating and is favored for its ability to handle a wide range of factory audio systems effectively.
Pros
- Adjustable bass control
- Multiple turn-on options
- Frequency response 21Hz-30kHz
- Remote level control included
- Strong brand reputation
Cons
- Active power required
- Higher price point
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One of its main advantages is the fully adjustable bass and main channel control which gives users precise command over the signal sent to the subwoofer. This active processing helps maintain strong output levels even at low volumes where passive units might struggle.
With a frequency response of 21Hz to 30kHz this unit delivers a wide range of audio fidelity suitable for most listening preferences. It also includes a remote level control and wire making it easier to integrate into complex car audio setups with multiple components.
Choose this active converter if you need robust signal handling and adjustable controls for a custom install. It is particularly useful for vehicles where factory settings might limit bass output without manual intervention.
Turn-On Flexibility
Selectable turn-on options allow you to match the converter to your specific amplifier or head unit requirements.
Frequency Range
The 21Hz to 30kHz response ensures both deep sub frequencies and clear mids are passed cleanly to the amp.
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5. NuIth Car Audio – Practical Gain Control
NuIth Car Audio
Level gain adjustment
Easy install wiring adapter
Clean sound output
The NuIth Car Audio adapter is a practical solution for converting speaker wire to RCA outputs with convenient level gain adjustment. It carries a 4.4 rating and is valued for its ability to improve sound quality without requiring complex rewiring or professional installation.
Pros
- Level gain adjustment
- Affordable price
- Reliable contact stability
- Neat power plug
- Works with factory radios
Cons
- Basic feature set
- No remote included
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This adapter converts high voltage signals from the factory speaker outputs to low voltage RCA inputs suitable for aftermarket amps. The level gain adjustment lets you dial in the bass without having to pull over and manually tweak the amplifier settings during a trip.
Its design includes a neat power plug with excellent bonding and contact stability to ensure a clean and consistent signal path. Users appreciate the straightforward installation process that involves tapping into speaker wires and sensing the signal to activate the relay.
Ideal for those who need a simple and cost-effective way to add a subwoofer to a stock stereo this converter delivers good performance. It ensures clean sound output and helps maintain stability in the connection between the radio and the amplifier.
Gain Adjustment
The level gain feature allows you to tune bass output on the device without needing to adjust the amplifier directly.
Signal Stability
Secure bonding and contact design minimize interference to keep your audio signal clean and reliable over time.
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6. AudioControl LC1i – Top Rated Performance
AudioControl LC1i
Up to 400 watts input
Ground isolation switch
Remote out trigger included
The AudioControl LC1i is a top-rated line output converter that offers robust performance with high power handling and a built-in line driver. Holding a 4.7 rating it is widely considered the go-to choice for those who need reliable signal conversion without sacrificing audio quality.
Pros
- High power handling
- Ground isolation switch
- Remote out feature
- Compact chassis design
- GTO turn on
Cons
- Remote knob sold separately
- Higher cost
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This unit can convert speaker-level signals up to 400 watts per channel from factory radios to high quality pre-amp outputs. The onboard load selection switches allow modern vehicles with factory amplifiers to detect speaker loads and continue passing audio seamlessly through the system.
A selectable ground isolation switch helps eliminate ground buzz or alternator whine ensuring a clean listening experience. The compact slim chassis saves space under the seat while the remote out feature lets you trigger downstream amplifiers effortlessly.
Buy this converter if you need professional grade signal strength and noise elimination for a high performance car audio system. Its features support both simple and complex installs making it versatile for a wide range of vehicle types.
Noise Elimination
Ground isolation switch effectively removes unwanted buzz or whine often caused by electrical interference in vehicles.
Remote Trigger
The remote out wire allows the converter to trigger downstream devices like amplifiers without extra wiring.
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7. Skar Audio SKAR2CH-LOC – Consistent Flat Response
Skar Audio SKAR2CH-LOC
Flat frequency response
60-ohm load applied
Up to 8 volts output
The Skar Audio SKAR2CH-LOC is a simple yet effective line out converter that ensures a flat frequency response at all volume levels. With a 4.5 rating it is appreciated for its ability to deliver consistent audio performance without coloration or distortion in the signal path.
Pros
- Flat 20Hz to 20kHz
- 60-ohm load
- Up to 8 volts RMS
- OEM and aftermarket compatible
- Reliable brand
Cons
- Basic feature set
- No level adjustment
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This unit applies a 60-ohm load to each channel to circumvent open-circuit protection found in some factory audio systems. It supports up to 55 watts of input signal and provides RCA line outputs up to 8 volts RMS ensuring strong enough signal for most amplifiers.
Compatibility with OEM radios aftermarket radios and smart radios makes it a versatile choice for various vehicle configurations. The straightforward design means it works reliably without needing additional power or complex wiring adjustments during the installation process.
Choose this converter if you need a reliable and consistent signal bridge between factory speakers and aftermarket subwoofer amps. It delivers the core functionality needed for a successful upgrade without unnecessary extra features that add cost or complexity.
Flat Frequency Response
Listeners get accurate sound across the full audio spectrum without artificial boosts or cuts from the converter.
Output Strength
The 8 volts RMS output ensures that downstream amplifiers receive a strong enough signal to drive subwoofers effectively.
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8. AudioControl LC2i – Best Bass Restoration
AudioControl LC2i
AccuBASS processing
Fixed variable outputs
Factory volume controls retained
The AudioControl LC2i is a premium line output converter known for its AccuBASS technology that corrects bass roll-off at higher volumes. It holds a 4.6 rating and is highly regarded for allowing users to retain factory volume and steering wheel controls during the upgrade.
Pros
- AccuBASS corrects roll-off
- Compact slim chassis
- Fixed and variable outputs
- GTO turn on
- Remote input included
Cons
- Fader control lost in multi amp
- Higher price
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This unit converts speaker-level signals up to 400 watts per channel ensuring that your amplifier receives a robust signal. The fixed and variable outputs with discrete onboard level controls allow you to customize your audio experience and make adjustments easily as needed.
The AccuBASS technology is a standout feature that restores bass when the volume is increased preventing the loss of low end punch. While fader control may be lost when running multiple amplifiers this model remains ideal for single subwoofer setups that prioritize deep sound.
Buy this if you want maximum bass control and premium processing capabilities in your car audio system. It delivers professional results for those willing to invest in top tier signal processing for their subwoofer integration.
AccuBASS Technology
This processing corrects factory roll-off to ensure deep bass remains punchy even when you turn the volume up.
Factory Control Retention
You keep using original volume and steering wheel controls which simplifies the integration into modern vehicles.
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9. SVS SoundPath – Best for Home Audio
SVS SoundPath
Home audio adapter
Gold-plated connectors
-30 dBV attenuation
The SVS SoundPath is a specialized adapter designed to convert speaker level outputs to line level RCA without any loss of fidelity. With a 4.3 rating it solves the problem of adding a subwoofer to legacy integrated amplifiers and home components where line inputs are missing.
Pros
- No fidelity loss
- High-quality connectors
- Narrow-tolerance resistors
- Home stereo solution
- Secure binding posts
Cons
- Home focus not car
- Higher cost for basic
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Its input uses 24K gold-plated 5-way speaker-level binding posts that accept bare wire spade or banana connectors securely. The output features 24K gold-plated stereo RCA jacks ensuring a secure connection to the line-level inputs of your powered subwoofer.
Premium narrow-tolerance resistors and wide-trace PCBs provide high-current handling and extreme power capabilities. The -30 dBV attenuation ensures that the device does not draw power from the loudspeaker amplifier preserving the integrity of the original audio signal.
Ideal for home audio enthusiasts adding a subwoofer to older amps this adapter offers premium build quality and precise signal conversion. It bridges the gap between vintage components and modern subwoofers with reliability and clarity that audiophiles appreciate.
Fidelity Preservation
The attenuation design ensures no power is drawn from the amplifier so sound quality remains intact.
Premium Connectors
Gold-plated posts and jacks provide secure corrosion-resistant connections for long term signal stability.
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10. NVX XLCA2 – Bass Enhancer with Auto-On
NVX XLCA2
xBOOST technology
Auto-on feature
Remote bass control
The NVX XLCA2 is a 2-channel line out converter that includes xBOOST technology to optimize bass response in your system. It holds a 4.5 rating and is valued for delivering deep powerful bass experiences with minimal distortion thanks to its digital bass enhancer features.
Pros
- xBOOST for bass
- Auto-on efficiency
- Remote knob included
- High power handling
- Flexible outputs
Cons
- Auto-on requires setup
- Higher price point
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This unit handles speaker-level inputs of up to 400 watts RMS allowing for seamless integration into almost any car audio setup. The selectable auto-on feature ensures that the device only activates when your vehicle is in use saving battery power and optimizing efficiency.
Included remote bass control gives you convenient adjustment of low-end output directly from the dashboard while driving. With a 9.5V pre-out 12V trigger out and dual amplifier outputs it offers versatile options for complex installs requiring multiple components.
Choose this if you want extra bass power and automated operation in your subwoofer setup. The xBOOST feature and auto-on efficiency make it a strong candidate for those seeking enhanced low-end performance without constant manual intervention.
xBOOST Technology
This feature optimizes low frequency response to deliver deep powerful bass with less distortion than standard units.
Auto-On Efficiency
Selecting auto-on ensures the converter activates only when needed preserving battery life during idle periods.
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Buying Guide – How to Choose the Best Line Out Converter Subwoofer
Selecting the right line out converter involves understanding key features that impact sound quality and ease of installation.
Signal Input Capacity
Ensure the converter can handle the voltage and power of your factory speakers without clipping. Higher capacity models protect your new amplifier from receiving distorted signals at high volumes which can cause speaker damage.
Look for models that support at least 55 watts or higher to match modern factory systems and prevent signal degradation.
Remote Turn-On Capability
A remote turn-on feature allows the converter to automatically activate your subwoofer amplifier when you start the car. This eliminates the need to run a separate wire to the ignition switch which simplifies installation and reduces clutter.
Choose a unit with DC offset or audio sense if your vehicle does not have a dedicated remote wire available for easy integration.
Bass Adjustment Features
Some converters include gain knobs or remote dials to adjust subwoofer volume from the driver seat. These controls provide flexibility to fine-tune bass levels without accessing the amplifier under the seat or trunk.
Consider units with remote control knobs if you prefer quick and easy adjustments while driving for optimal listening comfort.
Build Quality and Size
A compact chassis helps the unit fit into tight spaces under seats or dash panels where installation space is limited. Durable construction ensures the device withstands temperature changes and vibration common in vehicle environments.
Prioritize models with metal housing or robust plastic casings to ensure long-term reliability in your car audio system.
Bass Restoration Technology
Factory radios often cut bass at higher volumes to protect speakers. Converters with BassLift or AccuBASS technologies restore this lost low-end ensuring punchy bass even at full volume.
If you notice weak bass at high volumes choose a converter with active bass correction to maintain consistent performance.
Brand Reputation and Support
Reputable brands like Kicker AudioControl and Skar offer better warranty coverage and technical support for installation issues. Reliable support can save time and money if you encounter wiring problems or compatibility questions during setup.
Select a brand with known reliability to ensure you get a quality product and assistance if any issues arise.
Output Voltage
The output voltage determines how strong the signal is sent to your amplifier. Higher RMS voltage ensures your amp has enough signal strength to produce powerful sound without distortion.
Aim for converters that provide at least 2 to 8 volts RMS output for optimal amplifier performance across various setups.
Installation Complexity
Simpler models reduce wiring errors and save time during setup. Check if the converter includes clear instructions and pre-terminated wiring harnesses to make the process smoother.
Choose units with straightforward wiring diagrams and included guides to ensure a successful installation without professional help.
How to Use and Care for Your Line Out Converter
Begin by locating your factory speaker wires behind the radio or dashboard. Identify the positive and negative wires for the front speakers to connect to the converter input terminals securely.
Connect the RCA cables from the converter output to your amplifier input ensuring tight connections to prevent signal loss or static. Use high-quality shielded cables to minimize interference from other electrical components.
Secure the converter to a stable surface using adhesive or brackets to prevent movement during driving. Protect connections from moisture and vibration by using electrical tape or heat shrink tubing on all exposed wires.
Frequently Asked Questions
Do I need a line out converter for a factory radio?
Yes a line out converter is essential for connecting a subwoofer amplifier to a factory radio. Factory systems output high level speaker signals that can damage aftermarket amps. The converter steps this down to line level RCA signals that amps expect for safe operation.
Does a line out converter reduce sound quality?
A high quality converter should not reduce sound quality if installed correctly. Some basic units may introduce noise but models with active processing and shielding ensure clean transfer. Selecting a reputable brand helps maintain audio fidelity during conversion.
Can I use a line out converter with a Bluetooth head unit?
Yes you can use a converter with a Bluetooth head unit if it outputs speaker level signals. If your unit has RCA pre-outs you may not need a converter. Check your system outputs to determine which setup fits your amplifier requirements best.
Why is my subwoofer not turning on?
This may happen if the remote turn-on wire is not connected properly. Ensure the converter senses the speaker signal correctly and provides 12 volts to the amp. Check wiring for shorts or loose connections that prevent proper activation.
Do I need extra power wiring for the converter?
Most passive converters draw power from the speaker signal and do not need extra wiring. Active converters may need a separate 12V power source from the battery. Check your specific model requirements to ensure all connections are secure.
What size is the ideal line out converter?
The ideal size is compact enough to fit under a seat or dash without blocking airflow or components. Look for units around 4 to 6 inches in length for easy hiding. Ensure there is enough room for heat dissipation around the device.
How do I adjust the subwoofer volume?
You can adjust volume using a remote knob included with the converter if available. Otherwise adjust the gain on your amplifier to match the signal strength. A proper gain setting ensures maximum bass without distortion during listening.
Is installation difficult for beginners?
Installation is manageable for beginners using simple wiring diagrams. Identify speaker wires and connect input and output cables correctly. If unsure consult online guides or ask a professional to ensure safe and correct setup for your vehicle.
Final Thoughts on Choosing the Best Line Out Converter Subwoofer
The top picks like the Kicker 46KISLOC2 AudioControl LC1i and LC2i offer reliable performance for different needs and budgets. Each unit provides clear benefits for adding subwoofers to factory systems without sacrificing sound quality.
Prioritize converters with remote turn-on features and high voltage capacity to ensure compatibility with modern cars. Selecting a model that matches your specific installation needs will lead to a smoother upgrade experience.
Remember to check current product listings for availability and latest features before purchasing. Prices and specs can change so verifying details ensures you get the best value for your car audio upgrade.