Best Line Out Converter for Subwoofer: Top Picks for Car Audio Upgrades
Answering the needs of car audio enthusiasts, a high-quality line-out converter (LOC) is essential for adding a subwoofer or external amp to a factory radio. The best options convert speaker-level signals to RCA line-level signals with minimal noise and distortion. This guide highlights five reliable LOCs that are well-suited for subwoofers and aftermarket amplifiers, along with a quick buyer’s table and practical tips to help you choose.
| Product | Best For | Why It Stands Out |
|---|---|---|
| Kicker 46KISLOC2 | Value-conscious upgrades | Compact, remote turn-on, solid signal conversion |
| CT Sounds CT-LC2 | Bass-focused installs | BassLift tech restores factory bass roll-off |
| Scosche LOC80 | Easy, versatile installs | High/low conversion and simple integration |
| Scosche LOC2SL | Flexible wiring layouts | Wide compatibility and clean signal |
| AudioControl LC1i | Premium sound and impedance matching | Line driver, impedance-aware outputs |
The selections above cover a range of budgets and installation needs. Each product is designed to help you connect an amplifier or subwoofer to a factory or aftermarket head unit while preserving audio fidelity and minimizing noise. The buyer profiles above indicate who benefits most from each option, helping you compare quickly.
Kicker 46KISLOC2 K-Series Stereo Line-Output Converter
The KISLOC2 converts a factory input into both RCA line-level signals and a remote turn-on wire, enabling a clean feed to an external amplifier. It accepts up to 55 watts (16 volts) of input, making it suitable for many factory radios before upgrading to an amp. Best for buyers who want a compact, straightforward LOC with a dedicated DC turn-on feature. A potential limitation is performance if the input signal exceeds its 55-watt rating, which can occur with very powerful factory systems.
CT Sounds CT-LC2 2-Channel Line-Out Converter
The CT-LC2 is a two-channel LOC featuring BassLift technology to compensate for factory bass roll-off. It provides full-range main output and a dedicated low-pass output for a subwoofer. This makes it ideal for users focusing on bass enhancement without complex wiring. Better for those who want mid/high clarity in addition to a solid bass path. Limitation: BassLift performance may vary with different factory head units and speaker configurations.
Scosche LOC2SL Line Output Converter
The LOC2SL offers high/low RCA conversion with remote control for easier tuning. It’s designed for seamless integration with factory radios and aftermarket amplifiers, ensuring no loss of sound quality. Best for installers who need flexible wiring options and straightforward compatibility. Caution: Complex installations may require careful grounding to avoid noise.
Scosche LOC80 Line Output Converter
The LOC80 is a versatile 2-channel LOC that handles speaker-to-RCA conversion with a focus on ease of installation. It’s well-suited for users upgrading a factory stereo to drive a subwoofer or amp with minimal rewiring. Choose this if you want reliable performance without needing advanced tuning. Limitation: Not all cars benefit equally from basic LOCs when chasing extreme bass output.
Skar Audio SKAR2CH-LOC 2-Channel LOC
The SKAR2CH-LOC is designed to work with OEM and aftermarket radios, accepting up to 55 watts (16 volts) of input and delivering a flat 20 Hz to 20 kHz range across volume levels. It’s especially useful for users who want a broad, undistorted frequency response to drive a subwoofer. Best for installers seeking a robust, wide-frequency LOC. Limitation: Performance may depend on the source unit’s compatibility with high-power LOCs.
AudioControl LC1i Active 2-Channel LOC
The LC1i acts as an active line driver with impedance matching, converting speaker-level signals into high-quality pre-amp outputs. It supports conversion up to 400W per channel and includes onboard load switches to adapt to modern vehicle loads. Best for premium systems needing robust signal conditioning and compatibility with late-model vehicles. Caution: Higher-end features may be more beneficial in systems requiring precise impedance management and multi-amp setups.
Buying Guide: How to Choose the Right LOC For Your Subwoofer
What should you consider when selecting a line-out converter for a subwoofer?
- Input power handling: Ensure the LOC can handle your factory head unit’s output. Exceeding the rating can introduce distortion or fail to drive your amp cleanly.
- Output options: Look for LOCs with both RCA line outputs and, if needed, a remote turn-on or bass-specific outputs to simplify wiring.
- Low noise and shielding: A quiet LOC prevents hiss or engine whine from reaching the subwoofer, especially important in crowded wiring environments.
- Compatibility: Check compatibility with OEM radios, aftermarket radios, and smart radios. Some LOCs offer specific bass restoration or equalization features that help bass-heavy builds.
- Installation complexity: Some LOCs are plug-and-play, while others need more extensive wiring or grounding. Choose based on your confidence level and vehicle.
- Additional features: BassLift, remote control, impedance matching, and onboard load switches can improve performance in modern vehicles with varied loads.
Frequently Asked Questions
- What is a line-out converter used for?
A line-out converter converts a speaker-level signal to a line-level signal suitable for an external amplifier or subwoofer, enabling upgrades without replacing the head unit.
- Do LOCs affect sound quality?
Yes, the right LOC preserves signal integrity, reduces noise, and maintains dynamic range, contributing to cleaner bass and overall sound.
- Can I use any LOC with any car audio setup?
Most LOCs are universal, but always verify input/output compatibility, power handling, and any vehicle-specific installation notes.
- Should I choose a two-channel or multi-channel LOC?
A two-channel LOC is common for boosting a sub or front stage, while multi-channel units support more complex systems with multiple amps.
- Is a built-in BassLift feature important?
BassLift or similar technology helps compensate for factory bass roll-off, which can provide a fuller bass response in many vehicles.
- Are LOCs compatible with factory radios that have digital outputs?
Most LOCs target analog speaker-level outputs; verify compatibility with your system’s specific interfaces before purchasing.