Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
4.5Editor score
Speaker to RCA conversion
Remote turn-on output
55 watts input capacity
In this guide
Upgrading your car audio system often requires adding a subwoofer, but factory radios lack RCA outputs. A line out converter subwoofer solves this by translating speaker-level signals into line-level outputs, enabling seamless amplifier integration without compromising sound quality.
We evaluated ten top-rated models based on signal fidelity, installation complexity, bass enhancement features, and compatibility with modern factory systems. Each product was analyzed for its ability to preserve audio integrity while delivering powerful low-end performance across diverse vehicle configurations.
Every pick highlights key strengths, technical specifications, and real-world performance insights. Prices and availability may change, so verify current details before purchasing. This guide ensures you select the ideal converter for your specific audio setup and budget constraints.
Top 3 Picks for Best Line Out Converter Subwoofer
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
4.7Editor score
400 watts input handling
Load selection switches
Built-in line driver
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
400 watts per channel
Remote knob compatible
Top 10 Best Line Out Converter Subwoofer in 2026 Compared
This side-by-side comparison evaluates all ten converters across critical performance metrics including signal handling, frequency response, bass restoration, and installation flexibility. Use this table to quickly identify which model aligns with your audio goals and vehicle requirements.
ProductsSpecificationsEditor scorePrice
Best Budget
Kicker 46KISLOC2
55 watts input
12V remote out
Speaker to RCA
DC offset sense
4.5Editor score
Editor's Choice
CT Sounds CT-LC2
BassLift technology
Full-range output
Low-pass sub out
Installation manual
4.4Editor score
Best Premium
Scosche LOC2SL
Remote control knob
Compact durable design
OEM RCA converter
Lifetime tech support
4.4Editor score
Skar Audio SKE2LOC
Active line converter
Adjustable bass control
Frequency 21Hz-30k
Remote level control
4.5Editor score
NuIth Car Audio
Speaker to RCA
Level gain adjustment
Simple relay install
Power plug design
4.4Editor score
AudioControl LC1i
400 watts input
Load switches
Ground isolation
Slim chassis
4.7Editor score
Skar Audio SKAR2CH-LOC
55 watts input
60-ohm load
8 volts RMS out
20Hz-20k flat
4.5Editor score
AudioControl LC2i
AccuBASS restore
400 watts per channel
Mounting brackets
Remote knob input
4.6Editor score
SVS SoundPath
Home audio focus
Gold-plated posts
30 dBV atten
Narrow-tolerance resistors
4.3Editor score
NVX XLCA2
xBOOST bass tech
400 watts RMS
Remote bass knob
12V trigger out
4.5Editor score
1. Kicker 46KISLOC2 – Best Overall Line Out Converter Subwoofer
Kicker 46KISLOC2
55 watts input
12V remote wire
DC offset signal
Compact stereo box
The Kicker 46KISLOC2 delivers exceptional value for budget-conscious audiophiles seeking seamless factory-to-aftermarket integration. Rated 4.5 stars, it converts speaker signals to RCA while providing a dedicated 12V remote turn-on wire, eliminating the need for separate trigger sources.
Pros
- Affordable pricing
- Simple wiring setup
- Reliable turn-on
- Good signal fidelity
Cons
- Limited bass boost
- No frequency control
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Its standout quality lies in automatic DC offset detection, which senses factory speaker output levels to activate your amplifier. This ensures consistent performance across volume changes without manual adjustments. The compact design fits easily under seats or dashboards.
While it lacks advanced bass restoration or EQ features, the KISLOC2 maintains clean signal integrity up to 55 watts input. For users prioritizing reliability over sonic tweaking, this trade-off is acceptable. It excels in straightforward subwoofer installations.
Choose this converter if you need a no-fuss solution that works with nearly any factory radio. Its proven track record and affordable price make it a top recommendation for beginners upgrading car audio systems efficiently.
Automatic Signal Detection
DC offset technology ensures the converter activates precisely when the radio plays audio, preventing false triggers or missed amplifier signals.
Compact Integration
Small dimensions allow discreet installation in tight vehicle spaces without obstructing wiring paths or compromising interior aesthetics.
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2. CT Sounds CT-LC2 – Best Bass Restoration Feature
CT Sounds CT-LC2
BassLift technology
Full-range main output
Low-pass sub output
Step-by-step manual
CT Sounds CT-LC2 stands out for its BassLift technology, designed to compensate for factory roll-off when volume increases. With a 4.4 rating, it offers both full-range main and dedicated low-pass bass outputs, enabling precise subwoofer integration without sacrificing mid-high clarity.
Pros
- Restores factory bass loss
- Separate subwoofer output
- Detailed installation guide
- Affordable mid-range price
Cons
- Manual installation required
- No remote control included
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The converter excels in restoring low-end response that factory systems often suppress at higher volumes. This feature is critical for music genres relying on deep bass. The included 34-page manual simplifies wiring for DIY installers unfamiliar with signal conversion.
While effective, the CT-LC2 lacks remote knobs or electronic adjustments. Bass tuning depends on your amplifier settings. However, the passive design ensures reliability without external power dependencies. It balances performance and ease of use well.
Ideal for listeners seeking enhanced bass without complex electronics. If your factory stereo rolls off frequencies above medium volume, this model ensures consistent low-end power across all listening levels efficiently.
Bass Compensation
BassLift actively counteracts factory equalization curves, preserving deep tones even when you turn up the volume on stock head units.
Output Versatility
Dual outputs allow feeding speakers and subwoofers simultaneously from one device, streamlining wiring for multi-zone audio setups.
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3. Scosche LOC2SL – Best Remote Convenience
Scosche LOC2SL
Remote control knob
Compact durable casing
High to low RCA
Lifetime tech support
The Scosche LOC2SL combines line conversion with a remote control knob, letting you adjust bass levels directly from the driver's seat. Rated 4.4 stars, it ensures seamless factory-to-aftermarket integration without sound loss, making it ideal for audiophiles demanding flexibility.
Pros
- On-the-fly bass adjustment
- Robust build quality
- Compatible with most radios
- Excellent customer service
Cons
- Remote requires drilling
- Fixed crossover points
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Its compact design fits tight spaces while maintaining durability against heat and vibration. The included remote enhances usability during drives, allowing real-time tuning without stopping. Scosche's lifetime tech support adds significant value for long-term reliability.
Installation may require mounting the remote knob, adding minor complexity. However, the signal fidelity remains excellent with minimal interference. The fixed crossover limits customization but suits most standard setups. Overall, a strong performer.
Select this converter if remote bass control is a priority. It bridges convenience and performance effectively, ensuring your subwoofer matches your mood without interrupting your journey or fumbling with amp knobs.
Driver Control
Remote knob placement on the dashboard lets you fine-tune subwoofer intensity instantly, adapting to different music genres on the fly.
Long-Term Reliability
Lifetime technical support ensures you receive assistance for installation or troubleshooting, reducing long-term ownership stress significantly.
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4. Skar Audio SKE2LOC – Best Active Control Features
Skar Audio SKE2LOC
Active line converter
Adjustable bass and main
Frequency 21Hz to 30k
Remote level included
The Skar Audio SKE2LOC is an active converter offering adjustable bass and main channel controls, providing granular EQ tuning. Rated 4.5 stars, it supports DC offset, audio sense, or remote 12V turn-on, catering to diverse vehicle electrical systems.
Pros
- Precise EQ adjustments
- Multiple turn-on modes
- Wide frequency range
- Remote included standard
Cons
- Requires power source
- Higher price point
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Frequency response spans 21Hz to 30kHz, ensuring full-spectrum fidelity. The included remote level control simplifies adjustments while driving. Active circuitry amplifies weak factory signals, guaranteeing robust amplifier triggering even at low volumes.
Active operation demands a constant power source, adding wiring steps. However, the sonic control gained justifies this for enthusiasts. Fixed crossover points limit ultra-fine tweaking, but overall flexibility surpasses passive models significantly.
Choose this if you demand sonic precision without external processors. It excels in systems where factory output levels vary widely, ensuring consistent performance regardless of source volume or music dynamics.
Active Signal Processing
Active circuitry boosts weak inputs, ensuring your amplifier receives strong signals even at factory radio low-volume settings.
Versatile Turn-On
Multiple sense modes let you match your vehicle's electrical architecture, avoiding compatibility headaches during installation.
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5. NuIth Car Audio – Best Easy Installation
NuIth Car Audio
Speaker to RCA adapter
Level gain adjustment
Simple relay turn-on
Stable power plug
The NuIth Car Audio converter prioritizes simplicity, allowing users to add amplifiers without complex rewiring. Rated 4.4 stars, it transforms speaker outputs to RCA with a level gain adjustment, letting you fine-tune bass without leaving the cabin.
Pros
- Plug-and-play wiring
- Gain knob included
- Clean signal output
- Affordable entry option
Cons
- Build quality basic
- Gain limited range
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Installation is straightforward: tap into speaker wires, and the internal relay triggers the amp. The power plug design ensures stable connections, reducing noise or signal dropouts. It suits DIY installers seeking quick upgrades.
Build quality is functional rather than premium, with fewer advanced features. The gain adjustment range may suit limited for extreme setups. However, for standard factory radios, it delivers reliable performance at an attractive price.
Ideal for beginners or those on tight budgets needing a functional converter. It balances cost and performance well, ensuring you achieve subwoofer integration without overspending on unnecessary features.
Plug-and-Play Design
Minimal wiring steps reduce installation time, making this accessible even for first-time car audio enthusiasts.
Gain Control
Integrated gain knob lets you balance subwoofer output against factory speakers, preventing overpowering low frequencies.
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6. AudioControl LC1i – Best Overall Line Out Converter Subwoofer
AudioControl LC1i
400 watts input
Load selection switches
Built-in line driver
Ground isolation switch
The AudioControl LC1i is a premium solution rated 4.7 stars, converting speaker signals up to 400W per channel. It includes a built-in line driver for optimal downstream amplifier performance and load selection switches to maintain factory amplifier detection in modern vehicles.
Pros
- Handles high power input
- Factory load detection
- Ground noise removal
- Compact slim chassis
Cons
- Remote knob sold separately
- Setup requires calibration
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Ground isolation eliminates alternator whine or buzz, a common issue in car audio. The slim chassis fits discreetly under seats. Optional remote knob integration allows dash control. Its reliability makes it a favorite among professional installers.
While excellent, remote accessories cost extra. Setup may require calibrating load switches for specific vehicle systems. However, the sonic fidelity and versatility outweigh these minor drawbacks. It handles complex factory electronics effortlessly.
Choose this for demanding installs where factory integrity matters. It bridges modern vehicle electronics and aftermarket power, ensuring clean, reliable audio without triggering factory warnings or protection modes.
Factory Load Preservation
Load switches mimic original speaker impedance, preventing modern amplifiers from shutting down due to perceived open circuits.
Noise Elimination
Ground isolation switch filters electrical interference, delivering clean signal even in electrically noisy vehicle environments.
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7. Skar Audio SKAR2CH-LOC – Best Mid-Range Value
Skar Audio SKAR2CH-LOC
55 watts input max
60-ohm load applied
8 volts RMS output
Flat 20Hz to 20k
The Skar Audio SKAR2CH-LOC offers reliable mid-range performance with a flat 20Hz to 20kHz response. Rated 4.5 stars, it applies a 60-ohm load to prevent open-circuit protection issues in modern amplifiers, ensuring stable operation.
Pros
- Consistent frequency response
- Open-circuit protection
- Affordable price
- Solid build quality
Cons
- No bass adjustment
- Limited power capacity
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It outputs up to 8 volts RMS, providing strong signal strength for most aftermarket amps. Compact and affordable, it suits straightforward setups needing clean conversion without extra bells. Installation is simple, with no external power required.
Lacking bass adjustments limits tuning flexibility. Power capacity caps at 55 watts, making it less suitable for high-output systems. However, for standard vehicles, it balances cost and performance exceptionally well.
Select this if you prioritize simplicity and cost-effectiveness. It delivers consistent audio translation without complications, ideal for users upgrading to basic subwoofer systems.
Open-Circuit Protection
60-ohm load prevents modern factory amplifiers from detecting open speaker lines and shutting down audio output.
Signal Strength
8-volt RMS output ensures downstream amplifiers receive strong signals, minimizing noise or distortion during playback.
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8. AudioControl LC2i – Best Premium Line Out Converter Subwoofer
AudioControl LC2i
AccuBASS technology
400 watts per channel
Mounting brackets included
Remote knob compatible
The AudioControl LC2i is the premium choice rated 4.6 stars, featuring AccuBASS technology to correct factory roll-off at higher volumes. It supports 400W per channel inputs and includes mounting brackets for seamless integration into vehicle interiors.
Pros
- AccuBASS restores low-end
- Handles 400W input
- Includes mounting hardware
- Remote knob ready
Cons
- Premium pricing
- Setup requires tuning
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AccuBASS continuously monitors volume levels, dynamically restoring bass lost due to factory compression. This ensures deep, impactful low-end regardless of listening volume. Remote knob compatibility allows on-the-fly adjustments without removing dash panels.
Premium pricing reflects its advanced features. Initial tuning may require patience to optimize AccuBASS thresholds. However, the sonic improvements justify the investment for enthusiasts prioritizing audio fidelity over cost.
Ideal for high-end systems demanding factory-quality integrity. If you refuse to compromise on bass response or signal clarity, this model delivers unmatched performance and reliability.
Dynamic Bass Correction
AccuBASS actively compensates for volume-dependent roll-off, ensuring bass remains tight and present even at high listening levels.
Installation Readiness
Included mounting brackets and compact chassis simplify secure installation under seats or in tight compartments without custom fabrication.
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9. SVS SoundPath – Best Home Audio Adapter
SVS SoundPath
Gold-plated posts
Narrow-tolerance resistors
-30 dBV attenuation
Secure RCA jacks
The SVS SoundPath adapter excels in home audio, converting speaker outputs to RCA without fidelity loss. Rated 4.3 stars, it uses 24K gold-plated binding posts and narrow-tolerance resistors to ensure precise attenuation without altering source quality.
Pros
- Premium component quality
- Zero power draw
- Fidelity preservation
- Versatile connectors
Cons
- Home audio focus
- Higher cost
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-30 dBV attenuation prevents drawing power from the source amplifier, protecting legacy components. Secure RCA jacks maintain signal integrity over long runs. Ideal for integrating powered subwoofers into vintage receivers or integrated amps lacking sub out.
Built for home systems, it lacks car-specific features like remote turn-on. Higher pricing reflects premium components and build. However, for audiophiles seeking pure signal translation, it delivers exceptional performance.
Choose this for home stereo upgrades where source protection is vital. It ensures clean, uncolored signal paths, preserving the integrity of high-fidelity legacy amplification setups.
Component Quality
24K gold plating prevents corrosion, maintaining optimal signal transfer over years of continuous use in home environments.
Source Protection
Passive design prevents voltage draw, safeguarding sensitive vintage or integrated amplifiers from stress or damage.
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10. NVX XLCA2 – Best Digital Bass Enhancement
NVX XLCA2
xBOOST bass tech
400 watts RMS input
Remote bass knob
12V trigger output
The NVX XLCA2 incorporates xBOOST technology to optimize bass response digitally. Rated 4.5 stars, it handles 400 watts RMS inputs and includes a remote bass knob for on-the-fly adjustments. Auto-on ensures efficiency by activating only when the vehicle is in use.
Pros
- Enhanced low-end via xBOOST
- Handles high power
- Remote included
- Auto-on efficiency
Cons
- Digital processing latency
- Slightly complex setup
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Its digital enhancement adds depth to factory signals without external DSPs. Dual amplifier outputs and 12V trigger provide flexibility for complex audio setups. Remote control allows instant bass customization without stopping or accessing the amp.
Digital processing introduces minimal latency, noticeable in high-precision systems. Setup may be more involved than passive units. However, the performance boost and convenience make it compelling for those seeking enhanced low-end effortlessly.
Select this for systems needing digital bass enhancement without full processors. It bridges simple converters and complex signal chains, delivering impactful low-end with user-friendly controls.
xBOOST Technology
xBOOST digitally optimizes low-end performance, adding punch and clarity to factory signals without distortion or noise.
Battery Efficiency
Auto-on feature conserves battery by engaging only during active use, preventing parasitic drain when the vehicle is off.
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Buying Guide – How to Choose the Best Line Out Converter Subwoofer
Selecting the right converter requires evaluating signal handling, bass restoration, and installation complexity. This guide outlines key factors to ensure optimal performance and seamless integration with your specific vehicle system.
Signal Fidelity and Handling
High-quality converters preserve audio integrity while translating speaker-level signals to RCA. Look for devices supporting 55 to 400 watts input, ensuring clean transmission even at high volumes. Poor fidelity leads to distortion or noise in your subwoofer output.
Prioritize models with low signal loss and minimal noise introduction to maintain crisp highs and deep lows.
Bass Restoration Technology
Factory systems often roll off bass at higher volumes. Converters with AccuBASS or BassLift actively restore lost frequencies, ensuring consistent low-end regardless of volume. This is critical for bass-heavy genres.
If your factory radio lacks dynamic range, choose a model with active bass compensation to avoid flat or weak subwoofer performance.
Remote Control Compatibility
Remote knobs allow adjusting subwoofer levels without reaching your amp. Some units include remotes; others offer input jacks. This feature enhances usability during driving and simplifies setup for frequent listeners.
Opt for models with remote inputs if you plan to adjust bass levels dynamically during your commute.
Factory Amplifier Compatibility
Modern vehicles use integrated factory amplifiers that require specific load impedances. Converters with load selection switches prevent detection errors and audio shutdowns. This ensures your factory amp continues functioning correctly.
Check your vehicle's wiring manual before choosing a converter to avoid compatibility issues with built-in amplification.
Installation Complexity
DIY-friendly models minimize wiring steps, using automatic signal sense or plug-and-play connectors. Complex systems may require external power or calibration. Consider your comfort level with car audio wiring before selecting.
Choose passive or semi-passive models if you lack experience with car electrical systems to reduce installation errors.
Build Quality and Durability
Car environments experience heat, vibration, and humidity. Durable converters feature robust casings and high-quality components like gold-plated terminals. Poor build quality leads to premature failure or signal degradation over time.
Invest in models with proven track records for thermal stability and component longevity.
Input Power Requirements
Active converters need constant power sources, while passive units rely solely on speaker signals. Ensure your installation space supports the power requirements without excessive battery drain. This affects both complexity and reliability.
Passive models are simpler for standard setups, while active models suit complex signal chains.
Price vs. Performance
Budget models deliver basic conversion, while premium units offer EQ, bass restoration, and remote features. Determine your needs before overspending. Balance cost with required features to achieve value without compromises.
Prioritize features you genuinely need rather than paying for unused premium functions.
How to Use and Care for Your Line Out Converter Subwoofer
Install the converter near the amplifier or under the dashboard to minimize wire runs. Connect factory speaker wires to the input terminals and RCA cables from the converter to your amplifier. Ensure all connections are secure to prevent signal dropouts or noise.
Power the converter correctly using a 12V source or internal sense wiring depending on the model. Test audio levels gradually to avoid damaging speakers or amplifiers. Adjust gain or bass settings slowly for optimal balance without clipping.
Periodically check connections for corrosion or looseness due to vehicle vibration. Keep the converter cool and dry to prevent overheating or moisture damage. Clean surrounding areas regularly to ensure proper airflow and long-term reliability.
Frequently Asked Questions
Do line out converters affect audio quality?
High-quality converters maintain excellent fidelity, but cheap units may introduce noise. Look for models with minimal signal loss and shielding to preserve audio integrity during conversion from speaker to RCA levels.
Can I use a converter with factory amplifiers?
Yes, but you need one with load switches to match factory impedance. Without this, modern vehicles may detect open circuits and disable audio output entirely.
What is the difference between active and passive converters?
Active converters require external power and offer adjustable EQ. Passive ones work directly from speaker signals with fewer wires. Active suits complex setups; passive works for standard installations.
Do converters work with all subwoofer amplifiers?
Most converters work with any RCA-input amplifier. Ensure signal levels match your amp's requirements to prevent distortion or weak performance during low-volume playback.
How do I wire the remote turn-on wire?
Connect the converter's remote output to your amplifier's remote terminal. Use an in-line fuse near the battery to protect the system. This triggers the amp when the radio powers on.
Can I install a converter myself?
Yes, if you have basic car audio knowledge. Follow wiring diagrams carefully and avoid connecting speaker wires to power sources. Professional help ensures safety and optimal system integration.
Why does my subwoofer cut out at high volume?
This often indicates insufficient signal handling. Check if your converter supports high wattage. Upgrade to a 400W model if factory signals peak higher than your current converter handles.
Do converters work with digital radios?
Most work with digital systems if the speaker outputs are analog. Some require bypassing digital processing to access analog speaker levels. Consult your vehicle's manual for specifics.
Final Thoughts on Choosing the Best Line Out Converter Subwoofer
The Kicker 46KISLOC2, AudioControl LC1i, and AudioControl LC2i lead the pack for reliability, performance, and premium features. Each addresses different needs from budget simplicity to advanced signal restoration.
Prioritize factors like bass restoration, load compatibility, and remote control based on your vehicle's factory system. The right converter transforms your audio setup without compromising source integrity or requiring extensive modifications.
Always verify current pricing and availability before purchasing. Models may vary by region or retailer, ensuring you select the best option for your specific installation requirements and budget.