The right line output converter (LOC) turns speaker-level signals into clean RCA outputs for a powered subwoofer or amplifier. Below is a quick comparison of top LOCs suited for adding a subwoofer to factory or aftermarket stereos.
| Product | Key Feature | Best For |
|---|---|---|
| Kicker 46KISLOC2 | Auto DC remote output, Accepts up to 55W | Simple installs that need remote turn-on |
| Scosche LOC2SL | Includes remote control knob, 2-channel conversion | Users who want easy level control from dash |
| NuIth 2-Channel Converter | Level gain adjustment, adds amp/subwoofer | Budget installs with adjustable gain |
| AudioControl LC2i | AccuBASS correction, fixed & variable outputs | Systems needing bass restoration for subs |
| CT Sounds CT-LC2 | BassLift + low-pass sub output | Factory systems with bass roll-off |
Kicker 46KISLOC2 Stereo Line-Output Converter
The KICKER 46KISLOC2 converts factory speaker wires into RCA outputs and generates a 100 mA, 12V remote turn-on using DC offset. It accepts up to 55 watts (16 volts) of input and is designed to preserve the original audio dynamics. This model is useful when the source head unit lacks a remote turn-on lead or RCA outputs. Installation uses existing speaker wiring which simplifies integration. The unit’s stated capability to maintain sonic accuracy makes it suitable for systems where minimal wiring changes are preferred.
Scosche LOC2SL Line Output Converter
The Scosche LOC2SL provides a 2-channel high-to-low conversion and includes a remote control knob for level adjustment. Described features emphasize compatibility with many factory systems and seamless integration to aftermarket amplifiers. The included knob lets users adjust subwoofer output from the driver seat without accessing the amp. This converter claims to preserve sound quality during conversion, positioning it as a practical choice for installs where end-user level control and straightforward integration are priorities.
NuIth 2-Channel Speaker To RCA Converter
The NuIth converter converts speaker-level outputs to RCA outputs for adding a subwoofer or amplifier to a stock stereo. Key features include a level gain adjustment allowing bass control without pulling over to adjust the amplifier. It supports two-channel or mono amplifier connections and is marketed to improve sound quality by converting high-voltage speaker signals into low-voltage RCA outputs. This unit is suited for budget-conscious installs requiring an adjustable output to tune bass relative to factory head units.
AudioControl LC2i 2-Channel Line Out Converter
The AudioControl LC2i offers two active speaker-level inputs that can accept up to 400 watts per channel. It provides both fixed and variable outputs with discrete level controls and includes AccuBASS processing to correct factory bass roll-off. AccuBASS restores low-frequency content often removed by OEM radios, making this model particularly relevant when adding a subwoofer to factory systems that lack adequate bass output. The LC2i is positioned as a feature-rich option for preserving distortion-free signal transfer and tailoring subwoofer response.
CT Sounds CT-LC2 Premium Line-Out Converter
The CT Sounds CT-LC2 features BassLift Technology with both a full-range main output and a low-pass bass output specifically for subwoofers. The BassLift function is intended to restore or compensate for factory bass roll-off, enabling deeper low-end reproduction when integrating a powered sub. The inclusion of a dedicated low-pass output simplifies wiring for subs and makes this converter advantageous for systems where OEM crossovers or roll-off limit subwoofer performance.
Buying Guide: Choosing The Right LOC For A Subwoofer
Selecting a line output converter for subwoofer integration requires assessing the factory system, desired control, and signal quality needs. Below are key considerations and comparison perspectives to guide decision-making.
Signal Handling And Power Tolerance
- Input Capacity: Verify the LOC’s speaker-level input rating. Higher ratings (e.g., 400W handling) are preferable when safeguarding against high-output speaker leads.
- Output Voltage: Higher Vrms outputs provide stronger, cleaner signals to the amplifier; ensure the LOC outputs compatible levels for your amp’s input sensitivity.
Bass Restoration And Frequency Options
- Bass Compensation: If your OEM radio has bass roll-off, choose units with AccuBASS or BassLift to restore low frequencies for the subwoofer.
- Dedicated Low-Pass Output: Models with a low-pass subwoofer output simplify crossover management and ensure the sub receives only low-frequency content.
User Control And Tuning
- Remote Level Control: A dash-mounted knob (like Scosche) provides convenient in-cabin sub level adjustment.
- Gain Adjustment: Onboard gain lets you match output to the amplifier without additional gear; look for discrete level controls for precise tuning.
Installation Practicalities
- Remote Turn-On: Some LOCs generate a 12V remote lead from the speaker outputs (Kicker), avoiding the need to find an existing remote wire.
- Wiring Simplicity: Units that accept speaker wires directly reduce labor; check connector types and physical footprint for tight dash spaces.
- Noise Isolation: Transformers or isolation circuitry (PAC mentions audio transformer use) can reduce ground-loop hum when integrating with factory electronics.
Compatibility And Use Cases
- Factory Radios With Short-Circuit Protection: Ensure the LOC is compatible; some models explicitly note support for OEM protection circuits.
- Aftermarket Vs Factory Systems: Active line drivers (AudioControl LC1i/LC2i) work well with both system types and offer distortion-free outputs suitable for sensitive amplifiers.
- Budget Vs Feature Set: Basic converters handle signal level changes and remote turn-on; premium units add bass processing and sub-specific outputs for higher-fidelity subwoofer integration.
Comparison Perspectives
- Feature-Rich Integration: Choose AudioControl LC2i or CT Sounds CT-LC2 if you need bass restoration and sub-specific outputs.
- Convenience And Simple Installs: KICKER KISLOC2 or NuIth units are optimal when minimal wiring changes and built-in remote turn-on or gain control are desired.
- User Control On-The-Fly: Scosche LOC2SL adds a remote knob for easy level adjustments during daily use or tuning sessions.
When matching a LOC to a subwoofer and amplifier, prioritize signal integrity, compatibility with the head unit’s protections, and the level of bass restoration required. Testing with your amplifier’s sensitivity and the vehicle’s acoustic response will help finalize the best fit for reliable, low-noise subwoofer performance.