Best Line Out Converter for Subwoofer: 5 Picks

Ever wish your car’s music could really *boom*? That deep, rumbling bass that makes your whole body feel the beat? If you’ve ever thought about adding a subwoofer to your car but were confused by all the wires and complicated terms, you’re not alone. Many people want that amazing sound, but they hit a wall when they realize their car stereo doesn’t have a special connection for a subwoofer.

This is where a Line Out Converter for your subwoofer comes in! It’s like a translator that lets your car’s existing speakers send their sound signals to a subwoofer. But with so many different types out there, picking the right one can feel like trying to solve a puzzle. You might worry about getting the wrong one, not getting good sound, or even damaging your car’s stereo system. It’s a common problem that stops many music lovers from getting the bass they crave.

But don’t worry! By the end of this post, you’ll understand exactly what a Line Out Converter is, why you might need one, and the important things to look for when you’re shopping. We’ll break it all down in a way that’s easy to understand, so you can confidently choose the perfect converter and finally get that awesome subwoofer sound you’ve been dreaming of. Let’s dive in and make your car’s audio system sing!

Top Line Out Converter For Subwoofer Recommendations

No. 1
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter w/Remote Turn-On Output
  • Add an amplifier to nearly any radio with the KISLOC2 Stereo Line-Out Converter. Experience true sonic accuracy at any volume level, with all the sparkling highs and thunderous lows of your original audio.
  • Using nothing more than your factory speaker wires, the innovative KISLOC2 automatically converts the speaker signal into both an RCA signal and a powerful 100 milli-amp, 12-volt remote wire using DC offset.
  • Accepts up to 55 watts (16 volts) of input signal
No. 2
Skar Audio SKAR2CH-LOC 2-Channel Speaker Wire to RCA Line-Out Converter
  • Compatible with OEM Radios, aftermarket radios, and smart radios
  • Accepts Up to 55 Watts (16 volts) of Input Signal
  • Flat 20Hz - 20kHz Frequency Range at All Volume Levels
  • Applies 60-ohm Load to Each Channel to Circumvent Open-Circuit Protection
  • RCA Line Outputs Up to 8 Volts RMS
No. 3
Scosche LOC2SL Line Output Converter with Remote Control Knob - 2CH High/Low RCA Converter Car Audio - Ideal for Subwoofer Amp - Line Level Converter for Car Stereo - Easy Installation - Quality Sound
  • Unmatched Versatility - Compatible with a wide range of car audio systems, this high to low audio converter offers flexible installation options, making it a go-to solution for converting speaker level signals to RCA line level signals for optimal sound
  • Seamless Integration - Effortlessly integrate your factory stereo with an aftermarket amplifier using this line level converter, ensuring no loss of sound quality; ideal for boosting your carโ€™s audio performance without complex rewiring
  • Enhanced Audio Experience - Transform your car audio system with the Scosche LOC2SL line output converter, delivering crisp and clear sound quality for your subwoofer; perfect for audiophiles seeking high-fidelity sound
  • Compact and Durable Design - Engineered by Scosche, the LOC2SL line output converter is compact and built to last, fitting easily into tight spaces while maintaining durability; a reliable upgrade for any car audio enthusiast
  • Optimal Signal Quality - Ensure maximum audio performance with this OEM quality RCA converter for car audio, designed to minimize signal interference and deliver clean, powerful sound; the perfect addition to your custom car audio setup
No. 4
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
  • ๐—จ๐—ฝ๐—ด๐—ฟ๐—ฎ๐—ฑ๐—ฒ ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ฎ๐˜‚๐—ฑ๐—ถ๐—ผ ๐˜€๐˜†๐˜€๐˜๐—ฒ๐—บ ๐˜„๐—ต๐—ถ๐—น๐—ฒ ๐—ธ๐—ฒ๐—ฒ๐—ฝ๐—ถ๐—ป๐—ด ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ณ๐—ฎ๐—ฐ๐˜๐—ผ๐—ฟ๐˜† ๐˜€๐˜๐—ฒ๐—ฟ๐—ฒ๐—ผ: Convert speaker-level signals up to 400W per channel from your OEM radio or amplifier to high quality pre-amp output signals directed to aftermarket subwoofers, amplifiers, and processors.
  • ๐— ๐—ฎ๐˜…๐—ถ๐—บ๐—ถ๐˜‡๐—ฒ ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ฏ๐—ฎ๐˜€๐˜€: AccuBASS processing technology corrects and restores bass roll-off when the volume is increased on the factory radio.
  • ๐—ฆ๐—ฎ๐˜ƒ๐—ฒ ๐˜ƒ๐—ฒ๐—ต๐—ถ๐—ฐ๐—น๐—ฒ ๐˜€๐—ฝ๐—ฎ๐—ฐ๐—ฒ: A compact slim chassis with integrated mounting brackets enables quick and easy installation without taking up extra room in your car. Dimensions: 5.4โ€L x 3.25โ€D x 1.5โ€H (6.5โ€L including mounting brackets).
  • ๐—ฅ๐—ฒ๐˜๐—ฎ๐—ถ๐—ป ๐—ถ๐—บ๐—ฝ๐—ผ๐—ฟ๐˜๐—ฎ๐—ป๐˜ ๐—ณ๐—ฎ๐—ฐ๐˜๐—ผ๐—ฟ๐˜† ๐—ณ๐—ฒ๐—ฎ๐˜๐˜‚๐—ฟ๐—ฒ๐˜€: Including the use of factory volume and steering wheel controls.
  • ๐—š๐—ฎ๐—ถ๐—ป ๐—ณ๐˜‚๐—น๐—น ๐—ฐ๐—ผ๐—ป๐˜๐—ฟ๐—ผ๐—น ๐—ผ๐˜ƒ๐—ฒ๐—ฟ ๐˜†๐—ผ๐˜‚๐—ฟ ๐˜€๐—ผ๐˜‚๐—ป๐—ฑ: Fixed and variable outputs with discrete onboard level controls allow you customize your audio and make adjustments easily. *Does not retain fader control when running multiple amplifiers. For applications where this is desired, use LC5i PRO, LC6i, LC7i, LC7i PRO.
No. 5
AudioControl LC1i Active 2-Channel Line Driver & Line Output Converter for Adding Subwoofers or Amplifiers to Factory Car Audio System, Replace OEM Head Unit, Impedance Matching, Distortion Free
  • ๐—จ๐—ฝ๐—ด๐—ฟ๐—ฎ๐—ฑ๐—ฒ ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ฎ๐˜‚๐—ฑ๐—ถ๐—ผ ๐˜€๐˜†๐˜€๐˜๐—ฒ๐—บ ๐˜„๐—ต๐—ถ๐—น๐—ฒ ๐—ธ๐—ฒ๐—ฒ๐—ฝ๐—ถ๐—ป๐—ด ๐˜†๐—ผ๐˜‚๐—ฟ ๐—ณ๐—ฎ๐—ฐ๐˜๐—ผ๐—ฟ๐˜† ๐˜€๐˜๐—ฒ๐—ฟ๐—ฒ๐—ผ: Convert speaker-level signals up to 400W (40V) per channel from your OEM radio or amplifier to high quality pre-amp output signals directed to aftermarket subwoofers, amplifiers, and processors.
  • ๐—ฆ๐—ฒ๐—ฎ๐—บ๐—น๐—ฒ๐˜€๐˜€๐—น๐˜† ๐—ถ๐—ป๐˜๐—ฒ๐—ด๐—ฟ๐—ฎ๐˜๐—ฒ ๐˜„๐—ถ๐˜๐—ต ๐—น๐—ฎ๐˜๐—ฒ ๐—บ๐—ผ๐—ฑ๐—ฒ๐—น ๐˜ƒ๐—ฒ๐—ต๐—ถ๐—ฐ๐—น๐—ฒ๐˜€: Onboard load selection switches allow factory amplifiers in modern systems to detect speaker loads and continue passing audio. Choose between 20 ohms, 60 ohms, and 20k ohms.
  • ๐—•๐—ผ๐—ผ๐˜€๐˜ ๐˜„๐—ฒ๐—ฎ๐—ธ ๐—ณ๐—ฎ๐—ฐ๐˜๐—ผ๐—ฟ๐˜† ๐—ฟ๐—ฎ๐—ฑ๐—ถ๐—ผ ๐˜€๐—ถ๐—ด๐—ป๐—ฎ๐—น๐˜€: Built-in line driver allows you to provide optimum signals for downstream amplifiers, subwoofers and processors.
  • ๐—–๐—ผ๐—ป๐˜๐—ฟ๐—ผ๐—น ๐˜€๐˜‚๐—ฏ๐˜„๐—ผ๐—ผ๐—ณ๐—ฒ๐—ฟ ๐—น๐—ฒ๐˜ƒ๐—ฒ๐—น๐˜€ ๐—ณ๐—ฟ๐—ผ๐—บ ๐˜๐—ต๐—ฒ ๐—ฑ๐—ฟ๐—ถ๐˜ƒ๐—ฒ๐—ฟโ€™๐˜€ ๐˜€๐—ฒ๐—ฎ๐˜: Optional ACR-1 dash knob remote includes a 20-foot remote cable and metal housing with integrated removable mounting tabs for custom flush mount installations (sold separately).
  • ๐—–๐—ต๐—ผ๐—ผ๐˜€๐—ฒ ๐˜†๐—ผ๐˜‚๐—ฟ ๐˜๐˜‚๐—ฟ๐—ป-๐—ผ๐—ป ๐—บ๐—ผ๐—ฑ๐—ฒ: Features selectable Great Turn On (GTO) signal sense to automatically power the LOC or remote 12V input for manual control.
No. 6
NuIth Car Audio Speaker Wire to RCA Line Output Converter, 2-Channel High to Low RCA Converter for Adding Amplifier Subwoofer to Stock Stereo
  • Car audio speaker level converter wiring adapter allows to add 2 channel or mono amplifier or subwoofer to existing factory or aftermarket car stereo kit
  • Convert car stereo speaker wire output to RCA Cable outputs: In order to improve the sound quality, the function of RCA output can convert high to low; The high voltage signal output of the amplifier/speaker converts to low-voltage signal
  • Convenient to use: There is the level gain adjustment to adjust the bass down without having to pull over and manually adjust the amplifier
  • Easy to install: Use this adapter when adding an amplifier to a factory radio that convert the radio's speaker level output to the lower amplifier RCA level input; Tap into a speaker wire and it senses the signal, and turns on a relay to send power to the amp
  • Reasonable and neat power plug, it has the prefect bonding and contact stability; Provide clean and excellent sound
No. 7
CT Sounds CT-LC2 2-Channel Premium Line-Out Converter with BassLift
  • 2-Channel Premium Line-Out Converter with BassLift Technology
  • Full-Range Main Output (Speaker) and Low-Pass Bass Output (Subwoofer)
  • โ€œBassLiftโ€ Technology Restores/Compensates For Factory Bass Roll-Off
  • Converts High-Level Signal Used To Play Factory Speakers Into Low-Level RCA Input
  • Includes 34-Page Product Manual w/ Step-By-Step Installation Instructions
No. 8
PAC SNI-35 Variable LOC Line Out Converter 1.2x6.25x5.9
  • Adjustable Line Output Converter
  • Use the SNI-35 when adding an amplifier to a factory radio to convert the radio's speaker level output to the lower amplifier (RCA) level input
  • Utilize Audio Transformer for Noise Isolation
  • Phase Adjusted

Your Guide to Getting More Bass: Choosing a Line Out Converter for Your Subwoofer

Want to add a powerful subwoofer to your car’s sound system but don’t have the right connections? A line out converter is your key to unlocking that deep bass. This guide will help you pick the best one.

What is a Line Out Converter for a Subwoofer?

Think of your car’s stereo system. It sends out sound signals. Many factory car stereos don’t have the special “line out” jacks that subwoofers need. A line out converter takes the speaker wires from your existing stereo and turns them into a clean signal that a subwoofer amplifier can use. It’s like a translator for your car’s audio.

Key Features to Look For

When you’re shopping, keep these important features in mind:

  • Number of Channels: Most converters handle two channels (left and right). Some offer more if you plan a complex system. For a basic subwoofer setup, two channels are usually enough.
  • Output Voltage: This tells you how strong the signal is. A higher output voltage (like 10 volts) generally means a cleaner, stronger signal for your amplifier.
  • Built-in Remote Turn-On: This is a super handy feature. It uses the audio signal itself to turn your amplifier on and off. You won’t need to run a separate wire from your car’s ignition for this.
  • Ground Loop Isolation: This helps prevent annoying buzzing or humming noises in your audio. It’s important for a clean sound.
  • Adjustable Gain/Level Control: Some converters let you fine-tune the signal strength. This helps you match the converter’s output to your amplifier’s input for the best sound.

Important Materials

The quality of the parts inside the converter matters.

  • Good Quality Components: Look for converters with well-made capacitors and resistors. These help ensure a clean and stable audio signal. Cheap parts can lead to a weak or noisy sound.
  • Durable Housing: The converter’s case should be sturdy. It protects the delicate electronics inside from vibrations and accidental bumps in your car. Metal housings are often more durable than plastic ones.

Factors That Improve or Reduce Quality

What makes one converter better than another?

  • Signal Filtering: The best converters have good internal filtering. This removes unwanted noise and keeps only the pure audio signal for your subwoofer.
  • Power Handling: While the converter itself doesn’t “handle” power like an amplifier, its ability to process the signal cleanly without distortion is crucial. A converter that can handle the full range of frequencies without introducing noise will sound much better.
  • Ease of Installation: A well-designed converter will have clear wiring instructions and easy-to-access terminals. This makes the installation process smoother for you.
  • Brand Reputation: Stick with well-known audio brands. They usually have a track record of making reliable products.

User Experience and Use Cases

Who needs a line out converter and why?

A line out converter is perfect for anyone who wants to add a subwoofer to a car that doesn’t have RCA outputs on its factory stereo. This includes:

  • Drivers of older cars with basic stereo systems.
  • People who want to upgrade their sound without replacing the entire head unit.
  • Those who want to add that extra punch of bass to their music.

The user experience is generally straightforward. You’ll tap into your car’s existing speaker wires, connect them to the converter, and then run RCA cables from the converter to your subwoofer amplifier. If the converter has a remote turn-on feature, it simplifies the wiring even further.

Frequently Asked Questions (FAQ)

Q: Do I need a line out converter if my car stereo has an AUX input?

A: An AUX input is different from a line out. While it can accept an audio signal, it’s usually not the clean, consistent signal that an amplifier needs for a subwoofer. A line out converter is still the best way to get a dedicated subwoofer signal.

Q: Will a line out converter affect my existing speakers?

A: No, a good line out converter will not negatively affect your existing speakers. It simply takes a portion of the speaker signal and converts it for your subwoofer.

Q: Can I use a line out converter with a factory amplifier?

A: Sometimes, but it can be tricky. If your car has a factory amplifier, it might already be processing the audio in a complex way. You’ll need to research your specific car model to see if a converter is compatible or if you need a more specialized interface.

Q: How do I know if I’m getting a good signal?

A: Listen for clean bass. If you hear humming, buzzing, or distorted bass, the signal might not be clean. Features like ground loop isolation and good filtering help ensure a good signal.

Q: Can I install a line out converter myself?

A: Yes, for many people, installing a line out converter is a DIY project. You’ll need basic tools and some understanding of car wiring. If you’re not comfortable, a professional car audio installer can do it for you.

Q: What if my car has a digital audio system?

A: Modern cars with digital audio systems can be more complex. You might need a digital-to-analog converter (DAC) or a specific integration module instead of a standard line out converter.

Q: How much should I expect to spend on a good line out converter?

A: You can find basic converters for $20-$50. For higher quality features like better output voltage and built-in remote turn-on, expect to spend $50-$100 or more.

Q: What’s the difference between a passive and active line out converter?

A: Passive converters are simpler and don’t require power. Active converters have their own power source and often provide a cleaner, stronger signal with more features.

Q: Can I use a line out converter for more than just a subwoofer?

A: Yes, you can use the clean RCA outputs from a line out converter to connect to any aftermarket amplifier, whether it’s for your main speakers or another subwoofer.

Q: How do I connect the remote turn-on wire if my converter doesn’t have it?

A: You’ll need to find a 12-volt accessory wire in your car’s fuse box or wiring harness that powers on when the ignition is on. This wire will then connect to the remote turn-on terminal of your amplifier.

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