Choosing the right line output converter (LOC) can make or break the upgrade path for your car audio system. The following picks convert speaker-level signals to RCA line-level signals, enabling a clean connection to amplifiers or subwoofers without sacrificing sound quality. This guide highlights five top options, covering versatility, ease of installation, and sound fidelity across a range of factory and aftermarket setups. Use the product summaries and buying guide to compare features, compatibility, and performance for your vehicle’s audio upgrade.
| Product | Brand | Key Benefit |
|---|---|---|
| Scosche LOC2SL | Scosche | High/Low conversion with remote knob; ideal for subwoofers |
| NuIth Line Output Converter | NuIth | Simple wiring with adjustable gain for bass control |
| AudioControl LC1i | AudioControl | Active 2-channel driver; wide input range; distortion-free |
| AudioControl LC2i | AudioControl | AccuBASS and Subwoofer Control for bass correction |
| Skar Audio SKAR2CH-LOC | Skar Audio | High compatibility with OEM and aftermarket radios |
Scosche LOC2SL Line Output Converter
The LOC2SL provides seamless integration between a factory stereo and an aftermarket amplifier. It converts high-level speaker signals to RCA line-level outputs, enabling a clean path to a subwoofer or additional amplifiers. The device is designed for broad compatibility across many car audio setups, supporting flexible installation options and preserving sound quality during the transition from factory to upgraded systems. This makes it a practical choice for mid-range to advanced upgrades where space and wiring considerations matter.
NuIth Car Audio Line Output Converter
The NuIth two-channel high-to-low converter adds an amplifier or subwoofer to a stock or upgraded stereo by converting speaker wire output to RCA outputs. It emphasizes ease of use by offering a level gain adjustment, allowing bass tuning without pulling over to touch the amplifier. This makes it a solid option for those who want a straightforward install with on-the-fly bass control to suit listening preferences and room acoustics inside a vehicle.
AudioControl LC1i Active 2-Channel Line Driver
The LC1i functions as an active two-channel line driver that can work with both factory and aftermarket systems. It supports speaker-level inputs up to 40V (400 watts RMS) and provides up to 9.5 Vrms output, ensuring robust, distortion-free amplification. Its impedance-matching design helps maintain signal integrity when adding an amplifier, making it a reliable choice for complex installations where signal clarity is critical.
AudioControl LC2i 2-Channel Line Out Converter
The LC2i adds two-channel line-level outputs with fixed and variable levels and discrete controls, along with AccuBASS processing to correct bass roll-off. This makes it ideal for vehicles that need precise bass control and improved deep-tone performance without data-driven signal loss. It supports high-powered inputs per channel, ensuring compatibility with various factory and aftermarket radios while preserving audio fidelity across the spectrum.
Skar Audio SKAR2CH-LOC
The SKAR2CH-LOC is designed to work with OEM, aftermarket, and smart radios by converting speaker wires to RCA outputs. It handles up to 55 watts (16 volts) of input and maintains a flat frequency response of 20 Hz to 20 kHz at all volume levels. This makes it a versatile option for users who have higher power demands or want to preserve a wide audio range when adding amplifiers or subwoofers to their system.
Buying Guide: Key Purchase Considerations
When selecting a LOC, consider compatibility with your head unit, amplifier, and vehicle electrical system. A few critical factors include signal quality, input/output options, and gain adjustment range. Devices with higher input headroom reduce distortion when connecting to strong factory signals or high-output aftermarket radios. If you plan on subwoofer amplification, look for bass correction features like AccuBASS or adjustable bass gain. For premium sound, prefer LOCs that offer low-noise performance and robust grounding options to minimize hum and interference.
Installation simplicity matters for DIY upgrades. Some LOCs provide remote control knobs for on-the-fly bass adjustments, while others rely on fixed-output configurations. If your goal is a clean, factory-looking install, a LOC that seamlessly integrates with OEM amplifiers and retainment of original equipment features (like JBL or Bose systems) can be advantageous. Budget-friendly options often strike a balance between ease of use and performance, whereas premium units may offer advanced DSP features and higher voltage handling for demanding setups.
Durability and compatibility are also important. Check cable lengths, mounting options, and whether the device can handle the vehicle’s electrical environment, including voltage spikes and ground loops. Finally, consider future upgrade plans. A LOC with scalable outputs or a modular design can accommodate additional amplifiers or new subwoofers without requiring a full rewire.
In sum, the best LOC choice depends on your audio goals, vehicle type, and preferred installation complexity. The five products highlighted here cover a broad range of needs—from straightforward installations to enhanced bass control and high-fidelity signal handling. Evaluate the compatibility notes, input/output headroom, and any included features to determine which converter aligns with your upgrade plan and sound expectations.