Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
4.5Editor score
Converts speaker signals to RCA
Includes remote turn-on output
Accepts up to 55 watts input
In this guide
Upgrading your car audio system often requires adding a subwoofer to deepen the bass response. However, modern factory stereos lack the necessary RCA outputs for aftermarket amplifiers. A line out converter subwoofer adapter solves this by transforming speaker level signals into compatible line level inputs.
We evaluated ten top rated models based on signal fidelity, ease of installation, and advanced features like remote bass control. Our analysis focuses on how each unit handles factory signal processing and preserves audio quality across different vehicle makes and models.
Each selection highlights specific strengths whether you need budget friendly basics or premium processing capabilities. Note that product availability and pricing may vary over time so always verify current listings before making your final purchase decision for your setup.
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 technology restores bass
Supports up to 400 watts input
Compact chassis with mounting brackets
SVS SoundPath Speaker Level Subwoofer Adapter, Home Audio Line Out Converter, Stereo RCA Output
4.3Editor score
Gold-plated binding posts
Premium grade resistors
No loss of fidelity
Top 10 Best Line Out Converter Subwoofer in 2026 Compared
The following comparison table outlines the key specifications and capabilities of each top ranked line out converter subwoofer to help you quickly identify the right model for your specific vehicle audio needs.
ProductsSpecificationsEditor scorePrice
Best Budget
Kicker 46KISLOC2
55 watts input
Remote turn-on output
2-channel converter
Speaker level input
4.5Editor score
Editor's Choice
CT Sounds CT-LC2
BassLift technology
Full-range main output
Low-pass bass output
34-page manual
4.4Editor score
Best Premium
Scosche LOC2SL
Remote control knob
2-channel high/low
OEM quality RCA
Lifetime tech support
4.4Editor score
Skar Audio SKE2LOC
Active line output
Adjustable bass control
Frequency response 21Hz
Remote level control
4.5Editor score
NuIth Car Audio
Speaker wire to RCA
Level gain adjustment
Compact power plug
Mono amplifier support
4.4Editor score
AudioControl LC1i
400 watts input
Onboard load selection
Ground isolation switch
Slim compact chassis
4.7Editor score
Skar Audio SKAR2CH-LOC
55 watts input
20Hz to 20kHz
60-ohm load
8 volts RMS out
4.5Editor score
AudioControl LC2i
400 watts input
AccuBASS technology
Variable outputs
Factory retention features
4.6Editor score
SVS SoundPath
Home audio adapter
Gold-plated posts
Wide-trace PCBs
No power draw
4.3Editor score
NVX XLCA2
400 watts RMS
xBOOST technology
9.5V pre-out
Remote bass knob
4.5Editor score
1. Kicker 46KISLOC2 – Best Value Line Out Converter
Kicker 46KISLOC2
Speaker to RCA
Remote turn-on 12V
55 watts input limit
DC offset technology
The Kicker 46KISLOC2 stands out as the most affordable option while maintaining solid performance for basic installs. It features DC offset technology to ensure reliable amplifier activation without needing a separate remote wire.
Pros
- Affordable price point
- Simple plug and play
- Built-in remote wire
- Compact size
Cons
- No bass control knob
- Limited signal adjustment
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Its ability to convert factory speaker signals into high quality RCA outputs makes it ideal for users adding a single subwoofer. The design ensures that your original radio remains untouched while delivering clean power to your new amp.
Trade-offs include a lack of onboard gain adjustments which means you rely entirely on your amplifier for sound shaping. This is acceptable for listeners who prioritize simplicity and cost over granular control.
Buy this if you want a no fuss solution to integrate an amplifier into a stock stereo system quickly. It delivers exactly what it promises without unnecessary complexity or expensive add-ons.
Effortless Installation Process
Tap directly into factory speaker wires using standard gauge tools to complete the setup in under an hour.
Reliable Amplifier Trigger
The integrated 100 milli-amp remote wire ensures your subwoofer amplifier powers on automatically with your radio.
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2. CT Sounds CT-LC2 – BassLift Enabled Converter
CT Sounds CT-LC2
2-channel converter
BassLift technology
Full-range main output
Low-pass sub output
CT Sounds has engineered this unit to specifically combat the common issue of bass loss in modern factory radios. The BassLift technology compensates for high volume roll-off ensuring your subwoofer gets consistent low frequency energy.
Pros
- Restores factory bass roll-off
- Dedicated subwoofer output
- Detailed installation manual
Cons
- Requires external power
- Slightly higher cost
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Separating the main speakers from the subwoofer signal allows for cleaner integration without interference. This dual output design makes it versatile for systems with both full-range speakers and a dedicated bass box.
The unit does require careful grounding and external power wiring which may challenge beginners. However the included manual offers step-by-step guidance that significantly reduces installation errors for most users.
Consider this model if you have noticed your factory radio loses bass at higher volumes and want to fix that electronically. It provides a balanced mix of performance and usability for mid-range systems.
Dynamic Bass Recovery
BassLift technology monitors signal levels and adjusts low frequencies to maintain punch even at high volumes.
Clear Signal Separation
Distinct outputs for main channels and subwoofers prevent signal overlap and ensure cleaner audio processing.
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3. Scosche LOC2SL – Remote Control Integration
Scosche LOC2SL
Remote level knob
2-channel conversion
High-low signal path
Lifetime tech support
The Scosche LOC2SL distinguishes itself with an included remote control knob that lets you adjust bass levels from the driver seat. This feature adds significant convenience for users who want flexibility without installing a complex digital interface.
Pros
- Convenient remote control
- OEM quality shielding
- Brand reputation
Cons
- Knob cable adds bulk
- Fixed frequency response
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Scosche is a trusted name in car audio known for reliable builds and strong technical support. The converter maintains signal integrity well preventing noise interference that often plagues cheaper alternatives.
Managing the extra wire for the remote knob can be slightly cumbersome in tight dashboard areas. Additionally the lack of frequency adjustments means you rely on the amplifier for fine-tuning high frequencies.
Pick this if having physical control over your subwoofer volume while driving is a priority for you. It offers a practical upgrade path for stock systems that need better interaction options.
On-the-Fly Adjustments
Use the included knob to lower or boost bass without pulling over or adjusting the amplifier physically.
Durable Construction
Built to withstand vehicle vibrations and temperature changes ensuring consistent performance over years of use.
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4. Skar Audio SKE2LOC – Active Signal Control
Skar Audio SKE2LOC
Active line output
Adjustable bass/main control
DC offset sensing
Remote level knob
Skar Audio brings active circuitry to this converter which significantly improves signal fidelity compared to passive options. This allows for more precise control over the output levels and ensures your amplifier receives a strong clean signal.
Pros
- Active signal processing
- Multiple turn-on modes
- Full bass adjustment
Cons
- Higher power requirements
- More complex wiring
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The inclusion of selectable turn-on options provides flexibility depending on your vehicle's electrical architecture. You can choose between audio sense or DC offset detection to ensure reliable activation without wiring conflicts.
Active units generally draw more power and require careful fuse protection during installation. The additional controls can also be confusing for first-timers who just need a basic converter solution.
Choose this if you are pushing high wattage or need precise signal management for a custom sound system. It offers professional-grade features in a relatively compact package.
Precision Signal Shaping
Active electronics refine the speaker signal before converting it to RCA for a cleaner and stronger output.
Flexible Power Options
Choose between audio trigger or DC offset detection to fit different factory radio configurations easily.
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5. NuIth Car Audio – Budget Friendly Adapter
NuIth Car Audio
High to low RCA
Level gain adjust
Compact power plug
Relay turn-on
NuIth offers a straightforward solution for budget-conscious shoppers who need basic functionality without extra bells or whistles. It performs the core conversion task effectively allowing you to connect aftermarket gear to stock radios.
Pros
- Very low cost
- Simple gain adjust
- Compact design
Cons
- Basic build quality
- Limited feature set
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The level gain adjustment knob is a welcome addition at this price point enabling some control over output volume. This helps prevent signal clipping and ensures your amplifier doesn't receive too much input.
Build quality is utilitarian so you should secure the unit well to avoid rattles. It lacks advanced features like bass restoration or active circuitry making it best for simple subwoofer installs.
This is the right pick for tight budgets where every dollar counts toward the amplifier or subwoofer itself. It does the job well enough for casual listeners.
Basic Signal Management
Converts high level signals safely while allowing minor volume tweaks to optimize the connection.
Space Efficient Fit
The small housing fits easily behind panels or under seats where space is limited in modern cars.
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6. AudioControl LC1i – Premium Signal Processing
AudioControl LC1i
400 watts input
Built-in line driver
Ground isolation switch
Load selection
AudioControl is renowned for high fidelity audio components and this unit lives up to that reputation. The built-in line driver ensures your signal remains strong even over long wire runs to your amplifier.
Pros
- Exceptional build quality
- Advanced noise reduction
- High signal handling
Cons
- High price point
- Overkill for basic setups
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Advanced features like ground isolation switches help eliminate annoying alternator whine that often occurs with factory systems. Load selection switches also allow it to work with modern factory amplifiers that need a resistive load.
The cost is significantly higher than basic models which may not be justified for simple single subwoofer systems. However for high-end builds preserving sound quality is worth the investment.
Select this if you demand audiophile grade performance and have a complex factory system with existing amplification. It offers the most robust handling of difficult factory signals on the market.
Noise Elimination Tech
Ground isolation switches let you cut out electrical noise sources for a cleaner quiet listening experience.
Load Compatibility
Selectable impedance settings ensure compatibility with modern vehicles that use complex factory amplifier systems.
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7. Skar Audio SKAR2CH-LOC – High Wattage Capacity
Skar Audio SKAR2CH-LOC
55 watts input
Flat frequency response
60-ohm load
8 volts RMS output
Skar Audio delivers a reliable unit designed to handle high voltage inputs without distortion. This makes it suitable for factory systems that push more signal than standard converters can handle efficiently.
Pros
- High voltage output
- Frequency response flat
- Affordable pricing
Cons
- No active processing
- Basic remote options
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The flat frequency response ensures that no specific frequencies are exaggerated or attenuated artificially. This neutral approach allows your amplifier to shape the sound as intended without coloration from the converter.
It lacks advanced bass enhancement or remote knobs which keeps it simple but less flexible for tweaking. You will rely on the amplifier controls for all tonal adjustments during use.
This model is ideal for those needing high signal capacity without spending extra on active features. It provides a sturdy foundation for robust factory audio systems.
Flat Signal Handling
A neutral frequency response ensures that your speakers and subwoofers receive unaltered audio signals.
Robust Power Handling
Accepts higher input voltage limits to work safely with factory systems that have stronger electrical outputs.
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8. AudioControl LC2i – Best All Rounder
AudioControl LC2i
400 watts input
AccuBASS technology
GTO turn-on
Variable outputs
The LC2i is widely considered the gold standard for line converters due to its AccuBASS technology. This feature actively corrects the bass roll-off that happens in factory radios when you turn the volume up.
Pros
- AccuBASS processing
- Variable output levels
- Compact mounting
Cons
- Higher price
- Fader control limitation
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Variable outputs give you granular control over how much signal reaches your amplifier allowing precise tuning. It retains factory volume controls which is vital for cars that use steering wheel interfaces.
The price is higher than budget options but the performance justifies the cost for serious enthusiasts. Note that it does not retain fader control if running multiple amplifiers simultaneously.
Choose this as your top pick if you want the best balance of features performance and ease of use. It solves the most common factory audio problems effectively.
AccuBASS Correction
Compensates for volume loss ensuring deep bass remains punchy even when cranking up the radio.
Factory Control Retention
Keeps your original steering wheel and dashboard controls active while adding aftermarket power.
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9. SVS SoundPath – Home Audio Premium Adapter
SVS SoundPath
Gold-plated posts
Home audio focus
High current handling
Stereo RCA output
While designed for home audio this adapter offers unmatched build quality for those seeking top tier connections. The gold-plated binding posts and wide-trace PCBs ensure a secure stable link to your powered subwoofer.
Pros
- Premium build materials
- High fidelity design
- Secure connections
Cons
- Home audio focused
- Higher cost
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It uses high-current resistors to handle power without drawing excess load from your amplifier. This means no loss of fidelity which is critical for audiophiles demanding the best sound quality possible.
The form factor and wiring style differ from car audio units so extra care is needed for vehicle installs. It is best suited for high-end home theater setups rather than standard car upgrades.
Use this if you are building a high-end home system and need a reliable passive converter. It represents the pinnacle of build quality in this category.
Premium Connection Quality
Gold-plated contacts ensure long-term reliability and minimal signal degradation over time.
Fidelity Preservation
Designed to add no coloration or noise to the audio signal during conversion.
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10. NVX XLCA2 – Digital Bass Enhancement
NVX XLCA2
400 watts RMS
xBOOST technology
Remote bass knob
Trigger output
NVX incorporates digital technology to enhance bass response significantly through its xBOOST feature. This allows for a deeper powerful low-end experience that can compensate for weak factory outputs effectively.
Pros
- Digital bass boost
- High power handling
- Versatile outputs
Cons
- Complex setup
- Higher voltage needs
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The 9.5V pre-out offers more signal voltage than standard converters helping to drive high-gain amplifiers better. A remote bass knob also lets you adjust levels quickly from the dashboard while driving.
The digital nature adds complexity to wiring which requires careful attention to ground and power lines. It is not for those seeking a simple passive connection to existing audio systems.
Opt for this if you want maximum bass impact and digital control features in your setup. It delivers a powerful boost for bass heavy music styles.
xBOOST Bass Enhancement
Digital processing enhances low-end frequencies to provide deeper punch than passive units allow.
Versatile Connectivity
Multiple outputs allow flexible integration with complex multi-amplifier car audio systems easily.
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Buying Guide – How to Choose the Best Line Out Converter Subwoofer
Selecting the right converter depends on your vehicle audio architecture and the quality of aftermarket components you plan to use.
Signal Type Compatibility
Check whether your factory stereo uses speaker level outputs or pre-amp lines. Most modern cars require a line out converter to interface with standard RCA amplifiers.
Always match the converter input type to your vehicle wiring to avoid signal loss.
Power Handling Capacity
Higher input wattage limits ensure the unit can handle strong factory signals without distortion. Look for units rated for at least 55 watts per channel for safety.
Exceeding the power limit can damage the converter or cause noise.
Active vs Passive Design
Active converters use internal circuitry to improve signal quality while passive ones are simpler and cheaper. Active models are better for complex factory systems or high-end audio.
Passive models work well for basic installations where budget is a primary concern.
Remote Control Options
Some converters include a remote knob to adjust bass levels from the driver seat. This adds convenience but requires routing a cable into the cabin.
Decide if you need on-the-fly adjustments before purchasing to simplify installation.
Bass Restoration Technology
Factory radios often cut bass at higher volumes. Converters with features like AccuBASS or BassLift compensate for this roll-off automatically.
This feature is critical for maintaining deep sound without manual adjustments.
Factory Feature Retention
Advanced models can retain steering wheel controls and factory amplifier loads. This is essential for luxury vehicles with complex integrated audio systems.
Verify the unit supports specific vehicle integration requirements before buying.
Build Quality and Shielding
Proper shielding prevents noise like alternator whine from entering your audio signal. Look for gold-plated connectors and robust internal components.
Durable builds ensure long term reliability in the harsh environment of a car.
Ease of Installation
Units with clear wiring diagrams and compact casings make installation easier. Consider if you have the tools to access the radio harness safely.
Simpler designs reduce the time and effort needed to complete the job.
How to Use and Care for Your Line Out Converter Subwoofer
First identify the correct speaker wires for your rear or front speakers by using a multimeter to test continuity. Connect the input leads of the converter to these wires ensuring positive to positive and negative to negative.
Second run RCA cables from the converter outputs to your amplifier inputs. Secure the remote turn-on wire to the blue antenna or remote wire on your amp to ensure it powers on with the radio.
Third secure the converter in a dry location away from direct sunlight and moisture. Regularly check connections for corrosion or loose terminals to maintain optimal audio performance over time.
Frequently Asked Questions
Do I need a line out converter if my factory radio has RCA outputs?
No if your factory head unit already has dedicated RCA pre-amp outputs you can connect your amplifier directly without a converter. These outputs provide a clean low voltage signal that matches aftermarket amplifiers perfectly.
What is the difference between speaker level and line level signals?
Speaker level signals carry high voltage from the factory amp while line level signals are low voltage standard RCA inputs. The converter bridges this gap to ensure your amplifier receives a compatible signal without distortion.
Can I use a line out converter with a factory equipped premium sound system?
Yes but you may need a model with advanced load handling to detect the factory amp. Check the manual to ensure it supports impedance changes so the system does not shut down.
Why does my subwoofer turn off randomly with the converter?
This usually happens when the turn-on signal is not strong enough to trigger the amplifier. Ensure you have connected the remote wire correctly or switch to a DC offset sensing model for better stability.
How do I reduce noise or whine after installing the converter?
Ground noise often stems from poor grounding or electromagnetic interference. Use a dedicated ground point to the chassis and route RCA cables away from power wires to minimize hum.
Is it better to use an active or passive line converter?
Active converters provide better signal integrity for difficult factory systems while passive units are cost effective for simple setups. Choose active if you have high power factory amps or complex wiring.
Can I install a line out converter without removing the dashboard?
Yes many modern converters are small enough to mount behind existing panels. You only need access to the speaker wires which often run under trim near the rear of the vehicle.
Final Thoughts on Choosing the Best Line Out Converter Subwoofer
The Kicker 46KISLOC2 and AudioControl LC2i lead the pack for value and advanced processing respectively. Selecting the right unit ensures your factory stereo remains intact while delivering powerful subwoofer performance.
Prioritize features like bass restoration and ground isolation to solve common factory audio issues effectively. These elements make a real difference in daily listening enjoyment and sound fidelity.
Always check current pricing and compatibility before finalizing your purchase. The market evolves quickly so verify the latest specs to ensure your investment matches your vehicle needs.