AudioControl Matrix Plus 6-Channel High Voltage Car Audio Line Driver
4.5Editor score
Three sets of balanced inputs
Boosts signals up to 13V
Adjustable gain controls for each channel
In this guide
Line drivers are essential components for upgrading factory car audio systems without replacing the head unit. They convert weak speaker level signals into strong pre-amp signals that aftermarket amplifiers can use effectively.
We compared ten top rated models based on voltage output, distortion levels, compatibility with modern vehicles, and ease of installation. Each option offers unique features for different system configurations and budget levels.
Each pick below shows key specs and real world performance traits to help you decide. Remember that prices can change over time so always check current listings before purchasing your new audio component.
Top 3 Picks for Best Line Driver Car Audio Options
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
4.7Editor score
Converts up to 400W speaker signals
Onboard load selection switches included
Built-in line driver for clean output
AudioControl LC2i 2-Channel Line Output Converter with AccuBASS
4.6Editor score
AccuBASS restores factory bass roll-off
Compact slim chassis for easy install
Retains factory volume and steering controls
Top 10 Best Line Driver Car Audio Options in 2026 Compared
Here is a side by side comparison of all ten products included in this guide. Each entry lists core specs and links to detailed reviews for further analysis of performance and fit.
ProductsSpecificationsEditor scorePrice
Best Budget
AudioControl Matrix Plus 6-Channel
Six channel line driver
Up to 13V peak output
Three sets of balanced inputs
Programmable subsonic filter
4.5Editor score
Editor's Choice
AudioControl LC1i
Two channel line converter
Up to 400W input capacity
Load selection switches included
Remote volume control ready
4.7Editor score
Best Premium
AudioControl EPICENTER PRO
Bass restoration processor built-in
Ultra clean high voltage signal
Adjustable parametric bass shaping
LED visual indicator included
4.8Editor score
DS18 XM3
Three way active crossover
11 volt line output driver
Adjustable bass boost remote
Tiffany RCA connectors
4.1Editor score
Timpano TPT-EQ7
Seven band graphic equalizer
Up to 10 volt output
Six channel RCA outputs
High level input included
4.6Editor score
Soundstream BX-LOC1
Premium bass processor
Up to 9 volt output
Noise free signal boost
Universal compatibility design
4.2Editor score
AudioControl LC2i
AccuBASS technology included
Up to 400W input capacity
Compact slim chassis design
Retains factory controls
4.6Editor score
Wavtech linkDQ
Two channel line converter
Adjustable parametric EQ included
Auto turn-on detection
RJ45 remote port
4.7Editor score
AudioControl Epicenter Micro PRO
Bass restoration processor
Built-in line driver
Compact mini form factor
Programmable subsonic filter
4.8Editor score
AudioControl Matrix Plus
Six channel line driver
Up to 24 dB gain
Top-mounted controls
LED voltage indicators
1. AudioControl Matrix Plus 6-Channel High Voltage Car Audio Line Driver – Best Premium
AudioControl Matrix Plus 6-Channel High Voltage Car Audio Line Driver
Up to 13V peak output
Three balanced differential inputs
Adjustable gain controls
Subsonic filter programmable
This premium line driver stands out with its six channel architecture and high voltage output capabilities. It holds a 4.5 star rating reflecting strong reliability and performance in complex car audio setups.
Pros
- Maximum 13V peak output
- Three sets of inputs
- Low distortion performance
- Durable conformal coating
- Flexible ground isolation
Cons
- Higher price point
- Optional remote sold separately
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The three sets of balanced differential inputs allow for clean signal separation which reduces noise and interference. Users can boost factory signals up to 13V peak ensuring downstream amplifiers receive optimal power.
While it offers extensive control options the high cost may not suit budget conscious buyers. Additionally the optional dash remote requires a separate purchase which adds to the total system expense.
This model is ideal for enthusiasts building multi amp systems who need maximum signal flexibility. It delivers professional grade performance that justifies the investment for serious car audio upgrades.
High Voltage Output Benefits
Boosting signals to 13V peak ensures amplifiers can reach full power without clipping or noise issues during high volume playback.
Flexible Connectivity Options
Three input sets and configurable grounding allow integration into almost any factory or aftermarket system without signal loss or interference.
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2. AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver – Editor's Choice
AudioControl LC1i 2-Channel Car Audio Line Output Converter & Line Driver
Up to 400W input capacity
Built-in line driver
Load selection switches
Remote control ready
The LC1i earns top marks for balancing performance and ease of use in most daily driver audio systems. Its 4.7 star rating highlights excellent user satisfaction and solid build quality.
Pros
- Strong signal conversion
- Modern vehicle compatibility
- Compact slim chassis
- Flexible turn-on modes
Cons
- Remote sold separately
- Limited to two channels
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It converts up to 400W speaker level signals into high quality pre-amp outputs perfect for powering subs or processors. Onboard load switches ensure factory amps remain active in modern systems.
The compact chassis fits easily under seats but remote volume control requires an extra purchase. Two channels may limit flexibility for systems needing separate front rear and sub control.
This unit suits most owners who want a reliable upgrade without replacing the factory radio. It delivers clear sound and stable connections that improve overall system performance immediately.
Factory Amp Compatibility
Load selection switches let modern factory amplifiers detect speaker loads and continue passing audio without shutting down or cutting out.
Signal Boost Performance
Built-in line driver provides optimum clean signals for downstream devices ensuring maximum power output without distortion or noise interference.
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3. AudioControl LC2i 2-Channel Line Output Converter with AccuBASS – Best Budget
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
Retains factory controls
Compact slim chassis
The LC2i is a favorite for budget conscious builders seeking strong performance and factory integration. With a 4.6 star rating it consistently delivers clean signal conversion for subwoofer installs.
Pros
- Bass restoration tech
- Factory volume retention
- Compact design
- Fixed and variable outputs
Cons
- No remote included
- No rear fader control
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AccuBASS technology corrects bass loss that occurs when factory radio volume increases which restores low end impact at higher listening levels. This feature alone makes it stand out among converters.
Fixed and variable outputs offer flexibility but the unit does not retain rear fader control when running multiple amps. A separate remote is needed for driver seat volume adjustments.
Ideal for most users who want to add subs without losing factory features. It provides reliable signal conversion and easy install that improves sound quality without major system changes.
AccuBASS Technology
This technology corrects and restores bass roll-off when the factory radio volume is increased ensuring deep bass remains strong at high levels.
Factory Feature Retention
Retains important factory features including volume and steering wheel controls so you do not lose convenience during your audio upgrade process.
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4. AudioControl The EPICENTER PRO Bass Restoration Processor & Line Driver – Best Overall
AudioControl The EPICENTER PRO Bass Restoration Processor & Line Driver
Bass restoration circuit
Up to 105dB SNR
Parametric bass shaping
LED visual indicator
This processor combines bass restoration with line driving capabilities to deliver exceptional sound quality. It holds a 4.8 star rating reflecting top tier performance in both bass and signal clarity.
Pros
- Deep bass restoration
- High signal-to-noise ratio
- Adjustable frequency sweep
- Visual indicator included
Cons
- Higher price point
- Remote sold separately
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The patented circuit detects upper-range harmonics and synthesizes a low-frequency foundation that adds chest thumping impact to tracks lacking low end. This feature transforms compressed factory audio effectively.
The cost and optional remote purchase may deter some buyers but the sonic benefits are significant. It requires careful tuning to match vehicle acoustics which adds to setup complexity.
Perfect for enthusiasts who want to maximize subwoofer performance from factory sources. It brings deep dynamic bass to modern systems while providing clean signal paths for amplifiers.
Patented Bass Restoration
Detects upper-range harmonics and synthesizes a low-frequency foundation for deep chest thumping impact on tracks that lack low-end authority.
Precision Signal Control
Achieves over 105dB signal-to-noise ratio with low distortion to ensure amplifiers receive clean optimized signals for maximum clean power.
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5. DS18 XM3 3-Way Active Crossover with Line Driver – 11V Output – Best Overall
DS18 XM3 3-Way Active Crossover with Line Driver – 11V Output, Adjustable Bass Boost (0–18dB), Remote Subwoofer Control with Clip Indicator, Tiffany RCA Connectors – Pro Car Audio Frequency Processor
Three way active crossover
11V line output
Adjustable bass boost
Tiffany RCA connectors
This crossover processor delivers precise frequency management for multi-way systems with a built-in line driver. It holds a 4.1 star rating showing solid functionality though it lags behind in user feedback.
Pros
- Full frequency control
- High voltage output
- Clip indicator included
- Compact design
Cons
- Lower rating than others
- Complex tuning needed
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The 11V output ensures strong clean signals for amplifiers while adjustable bass boost and remote control let you tune low end on the fly. Tiffany connectors provide secure professional connections.
Users report it is slightly more complex to tune than simpler converters and the lower rating reflects mixed experiences. The compact size helps but the price is higher than basic options.
Best for systems needing detailed crossover control rather than simple signal conversion. It offers strong performance for those who want full command of front rear and sub frequencies.
Precision Frequency Control
Delivers unmatched clarity and frequency accuracy for a truly balanced system through independent front rear and subwoofer tuning capabilities.
High Voltage Output
Boosts signal strength to 11V for cleaner sound and reduced distortion ensuring amplifiers receive a high-voltage noise-free pre-output.
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6. Timpano TPT-EQ7 7 Band Equalizer – Best Overall
Timpano 7 band equalizer TPT-EQ7 10V High Voltage Line Driver 6 Channel RCA Output and Subwoofer Control and Crossover 1/2 Din Graphic Car Audio Eq with High Level Input
7 band equalizer
Up to 10V output
6 channel RCA output
High level input
This unit combines a seven band equalizer with line driver functions for comprehensive audio shaping. It holds a 4.6 star rating showing users appreciate its versatility and ease of adjustment.
Pros
- Full tone control
- High voltage output
- Built-in converter
- Slim design
Cons
- Dial tuning not digital
- Limited subwoofer control
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Each band offers up to plus or minus 12 dB of adjustment for precise tone control and the high voltage output ensures low noise over long cable runs. The built-in converter adds convenience.
The design is compact but tuning relies on physical dials which may lack precision for some users. The subwoofer level control is present but lacks remote flexibility.
Ideal for listeners who want to fine-tune tone across the entire frequency range. It balances signal conversion with EQ capabilities for a complete system upgrade in one device.
Seven Band Adjustment
Features 7 adjustable frequencies allowing you to tailor your sound with plus or minus 12 dB on each band for ultimate audio performance.
High Voltage Line Output
Provides up to 10 volt RCA line output for low noise even with long cable runs in large vehicles or complex systems.
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7. Soundstream BX-LOC1 Premium Bass Processor – Best Overall
Soundstream Premium Bass Processor with Line Driver/Line Converter for Car Audio – High Voltage Output, Noise-Free Signal Boost, OEM Car Stereo to RCA Line Level Conversion (BX-LOC1)
Adjustable up to 9V
Noise free shielding
Impedance matching
Compact footprint
The BX-LOC1 aims to restore low-end impact to compressed factory audio while driving signal lines cleanly. It holds a 4.2 star rating indicating solid performance for moderate system upgrades.
Pros
- Bass restoration features
- Noise free design
- Universal compatibility
- Clipping indicator
Cons
- Average rating score
- Limited remote options
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It enhances weak signals for stronger cleaner output with built-in ground isolation to reduce hiss and hum. The adjustable line driver ensures maximum performance and headroom for powerful sound.
While effective for restoring bass it lacks the advanced tuning of higher-end processors. The compact size is a plus but the average rating suggests users have mixed opinions on tuning depth.
Best for owners looking to upgrade audio without replacing the factory stereo head. It provides a simple reliable path to better bass and signal levels at a moderate price.
Signal Restoration
Enhances weak audio signals for stronger cleaner output to your amplifier or subwoofer bringing bass back to factory systems effectively.
Noise Free Performance
Built with premium shielding and ground isolation to reduce hiss hum and engine noise for a professional quality listening experience.
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8. AudioControl LC2i 2-Channel Line Output Converter with AccuBASS – Best Overall
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
Up to 400W input
AccuBASS technology
Fixed and variable outputs
Retains factory controls
This converter is a repeat pick for its balance of cost and feature set. It holds a 4.6 star rating showing consistent user satisfaction with its ability to retain factory features.
Pros
- Bass restoration
- Factory feature retention
- Compact design
- High input capacity
Cons
- Remote sold separately
- Limited channels
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AccuBASS restores bass roll-off at higher volumes which keeps low end tight when the system is loud. It converts up to 400W signals cleanly while retaining volume and steering controls.
The main trade-off is the need to buy a remote for driver seat control. It also lacks separate rear fader control when using multiple amplifiers which limits complex setups.
Perfect for most users wanting to add subs without losing convenience. It delivers reliable conversion and factory integration that improves sound quality with minimal hassle or expense.
Factory Feature Retention
Retains important factory features including volume and steering wheel controls so you do not lose convenience during your audio upgrade process.
AccuBASS Technology
Corrects and restores bass roll-off when the factory radio volume is increased ensuring deep bass remains strong at high levels.
We may earn a commission when you buy through this link, at no additional cost to you.
9. Wavtech linkDQ 2-Channel Line Output Converter – Best Overall
Wavtech linkDQ – 2-Channel Line Output Converter & Line Driver with PEQ and Remote Capable
Adjustable parametric EQ
Auto turn-on detection
RJ45 remote port
OEM load detect
This unit combines line conversion with parametric equalization for targeted frequency correction. It holds a 4.7 star rating showing strong satisfaction among users who need EQ tweaks.
Pros
- Parametric EQ included
- Strong rating
- Easy remote upgrades
- Auto turn-on modes
Cons
- Remote sold separately
- Limited channel count
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The adjustable PEQ allows narrow or wide range corrections for low-frequency deficiencies which is rare in standard converters. It also detects OEM loads and auto turns on via signal or DC-offset.
Remote volume control requires a separate RJ45 port purchase which adds to total cost. Two channels may be limiting for systems needing full multi-amp control options.
Best for users who need precise frequency tuning beyond simple crossover points. It delivers high quality signal conversion and flexible control that adapts to various system needs.
Parametric Equalization
Features an adjustable parametric EQ with narrow or wide range selection allowing corrections to any low frequency deficiency in your system.
Auto Turn-On Modes
Features auto turn-on via DC-offset or Audio Signal Detect to ensure your system powers on automatically when you start the vehicle.
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10. AudioControl Epicenter Micro PRO Bass Restoration Processor with LOC – Best Overall
AudioControl Epicenter Micro PRO Bass Restoration Processor with LOC
Bass restoration circuit
Up to 105dB SNR
Compact mini form factor
Subsonic filter programmable
This micro-sized processor delivers deep bass restoration and high quality line driving in a tiny footprint. It holds a 4.8 star rating showing users love its performance despite the high cost.
Pros
- Deep bass restoration
- High signal-to-noise ratio
- Small chassis size
- Conformal coating
Cons
- High price point
- Remote sold separately
We may earn a commission when you buy through this link, at no additional cost to you.
It synthesizes low-frequency foundation from upper harmonics to add chest-thumping impact to compressed tracks. The chassis is fully coated for moisture resistance and fits in tight spaces easily.
The price and need for a separate remote add to total cost which may not suit budget builds. Setup requires care to match the vehicle acoustics which adds to complexity.
Ideal for high-end installs where space is limited but performance is paramount. It restores deep dynamic bass while providing clean optimized signal paths for downstream amplifiers.
Patented Bass Restoration
Detects upper-range harmonics and synthesizes a powerful low-frequency foundation for deep chest thumping impact on tracks that lack low-end authority.
Compact Mini Form Factor
The discreet compact chassis eliminates wasted vehicle space making it easy to install in tight spots without compromising system performance.
We may earn a commission when you buy through this link, at no additional cost to you.
Buying Guide – How to Choose the Best Line Driver Car Audio Options
Selecting the right line driver depends on your vehicle's factory system and upgrade goals. These factors help you match specs to your needs.
Output Voltage
Higher voltage output ensures amplifiers receive enough signal to reach full power. Look for units delivering at least 9V RMS with many top models offering 13V peak for clean headroom.
Choose higher voltage for maximum clean power without clipping at high volumes.
Channel Count
Two channel units work for most subwoofer installs while six channel models support multi-zone systems. Match the input and output count to your amplifier configuration needs.
Ensure the channel count matches your system complexity to avoid signal loss or unused inputs.
Factory System Compatibility
Modern vehicles with factory amps need load detection switches to keep them active. Select units with onboard load selection to prevent amplifier shutdowns during play.
Verify factory amplifier detection features to ensure your OEM system continues working properly.
Bass Restoration
Some processors detect and restore low-frequency harmonics lost in factory compression. This feature adds depth and impact to tracks that lack low-end authority.
Look for bass restoration circuitry if factory sound feels thin or compressed at volume.
Noise Reduction
Ground isolation switches and shielding reduce alternator whine and system noise. These features keep your signal path clean without adding extra filters.
Choose units with selectable ground isolation to eliminate buzz and engine noise.
Installation Size
Slim chassis designs fit under seats or in tight compartments without blocking airflow. Compact units make routing easier and keep the car interior clean.
Measure available space and choose slim profiles that match your install location constraints.
Remote Control
Driver seat volume control improves convenience and tuning flexibility. Some units include optional ports for external knobs while others have built-in remote inputs.
Check if remote volume control is included or requires a separate purchase for your setup.
Build Quality
Conformal coating protects internal components from moisture and dust. High quality construction ensures longevity and stable performance in varying conditions.
Choose units with conformal coating for protection against environmental factors and wear.
How to Use and Care for Your Line Driver Car Audio Options
Connect the line driver between your factory radio and aftermarket amplifiers using speaker level or RCA inputs as supported. Use the correct ground terminal and match load settings for factory amps.
Set gain controls using the onboard LEDs or a multimeter to avoid clipping. Ensure your gain is high enough for full power but low enough to prevent distortion.
Keep connections tight and shielded to maintain signal quality. Check grounding points periodically to ensure stable noise-free operation over time.
Frequently Asked Questions
What is a line driver in car audio?
A line driver converts weak factory speaker signals into strong pre-amp signals. This allows aftermarket amplifiers to receive clean high voltage audio for full power output.
Do I need a line driver if my head unit has RCA outputs?
No. If your head unit has pre-amp RCA outputs you can connect directly to amplifiers. Line drivers are for factory radios without RCA outputs.
Can a line driver restore factory bass?
Yes. Some models include bass restoration circuits that detect harmonics and synthesize low end to fix factory audio that lacks depth.
How do I choose the right voltage output?
Most systems need at least 9V RMS. Higher voltage like 13V peak provides more headroom and ensures amplifiers can reach maximum clean power.
Does a line driver affect factory controls?
Quality units retain factory volume and steering wheel controls. Look for features that specify factory feature retention in the product data.
What is AccuBASS technology?
AccuBASS corrects bass roll-off when factory radio volume increases. This keeps low end strong at high volumes for consistent sound.
Do line drivers work with factory amplifiers?
Yes. Choose models with onboard load selection switches that allow factory amplifiers to detect speaker loads and continue passing audio.
Can I use a line driver with an equalizer?
Yes. Some units have built-in EQ or can connect between the source and an external graphic or parametric equalizer for tone control.
Final Thoughts on Choosing the Best Line Driver Car Audio Options
These ten models offer strong performance across different needs from budget to premium upgrades. The Matrix Plus leads in voltage and channels while the LC1i and LC2i provide reliable factory integration.
Prioritize voltage output and factory compatibility before considering advanced features like bass restoration. Ensure the unit matches your amplifier needs and available install space.
Prices and availability change regularly so verify current listings before purchasing. Choose the model that fits your system goals for a clean reliable car audio upgrade.