The 7 Best Line Output Converters of 2026

The Skar Audio SKAR2CH-LOC is a compact 2-channel line-out converter that converts high-level speaker wire signals from your car radio into low-level RCA outputs, perfect for connecting amplifiers. It targets car audio enthusiasts upgrading factory OEM systems, aftermarket head units, or smart radios without full replacements.

Standout features include handling up to 55 watts (16 volts) of input signal and a flat 20Hz-20kHz frequency response at all volume levels, ensuring no distortion or frequency roll-off. The 60-ohm load per channel circumvents open-circuit protection in factory radios, while RCA outputs reach up to 8 volts RMS for strong, clean signals to downstream amps.

Build quality is solid with a straightforward design that prioritizes reliability over flash. It installs easily behind the radio with basic wiring, though professional results demand proper speaker-level tapping. Real-world use delivers consistent audio clarity, making it a go-to for clean integration in daily drivers or competition builds.

Potential drawbacks include the need for soldering or T-taps during setup and fixed gain settings that might require volume matching. No major reliability issues stand out from its robust specs.

In verdict, the SKAR2CH-LOC excels as a high-performance LOC for reliable signal conversion, earning high marks for power handling and sound fidelity in car audio upgrades.

Channels: 2-Channel

Input: Speaker Wire, up to 55 Watts (16 volts)

Frequency Response: Flat 20Hz - 20kHz at all volume levels

Load Impedance: 60-ohm per channel

Output: RCA Line Outputs up to 8 Volts RMS

Compatibility: OEM Radios, aftermarket radios, smart radios

The Kicker 46KISLOC2 KISLOC2 is a compact stereo line-output converter designed for car audio enthusiasts looking to add amplifiers to factory or aftermarket radios without major modifications. It taps directly into speaker wires to convert high-level signals to low-level RCA outputs, plus generates a remote turn-on wire via DC offset, making it ideal for those upgrading sound systems in daily drivers or custom builds.

Standout performance comes from its inductor-free design, delivering a perfectly flat 20Hz-20kHz frequency response regardless of volume, ensuring sparkling highs and thunderous lows match the source material. It handles up to 55W (16V) inputs and outputs up to 8V, with an LED indicator for easy DC offset confirmation. Real-world users praise its reliability in turning on multiple amps without hunting for switched power.

Build quality is solid with durable components suited for vehicle vibrations, and the straightforward design minimizes points of failure. Installation is user-friendly for DIYers familiar with basic wiring, though routing factory harnesses cleanly takes care.

Potential drawbacks include needing to verify smart radio impedance (60Ω or lower) with a dealer, and it may not suit extremely high-power setups beyond its input limits. Overall, the KISLOC2 earns high marks for simplicity and sound fidelity.

Verdict: A top choice for clean, accurate amp integration. Buy if you want hassle-free audio upgrades without compromising quality.

ASIN: B07VKFSLKN

Input: Up to 55W (16V) speaker signal

Output: Up to 8V RCA, 100mA 12V remote wire

Frequency Response: Flat 20Hz-20kHz at all volumes

Compatibility: Standard radios and most smart radios (60Ω impedance or lower required)

Includes: LED DC offset indicator

The Scosche LOC2SL is a 2-channel line output converter designed for car audio enthusiasts who want to integrate aftermarket amplifiers or subwoofers into factory stereos. It converts high-level speaker wire signals to low-level RCA outputs, making it perfect for upgrading sound without replacing the head unit. Ideal for both casual drivers and audiophiles seeking better bass and clarity.

Standout features include a signal-sensing remote turn-on that automatically activates your amp, and a mountable knob for on-the-fly bass adjustments from the dash. It handles high-power stereos up to 80 watts per channel, delivering full-range audio with independent left and right channel controls. Real-world performance shines in maintaining clean signal quality, even in demanding setups.

Build quality is compact and durable, fitting snugly in vehicles while withstanding vibrations. Installation is straightforward for those comfortable with basic wiring, though it involves tapping speaker lines. Potential drawbacks include the need for wiring know-how and its 2-channel limit for simpler systems.

Overall, the LOC2SL offers exceptional value for enhancing car audio, backed by Scosche's reputation. It's a reliable choice that punches above its weight in versatility and sound improvement.

Easy installation with no head unit removal required.

Compatible with high-power stereos up to 80 watts per channel.

Converts speaker-level inputs to RCA line-level outputs.

Signal-sensing remote turn-on for amplifiers.

Mountable bass level control knob with independent channel adjustments.

Supports adding 2-channel or mono amps and subwoofers.

The AudioControl LC1i is an active 2-channel line driver and line output converter tailored for car audio enthusiasts upgrading factory systems with aftermarket amplifiers. It excels at converting speaker-level signals from stock head units into low-level RCA outputs, making it ideal for those who want to enhance bass and clarity without replacing the entire radio.

Standout features include speaker-level inputs that handle up to 40V or 400 watts RMS, delivering a robust 9.5Vrms output free of distortion. The load selection switch offers 20, 60, or 20,000 ohm settings to mimic speaker impedance and avoid triggering factory safety shutoffs. Auto turn-on via DC offset or audio detection, plus a level control with maximized LED, ensure effortless setup and optimal performance in real-world installs.

Build quality is solid with a compact chassis that mounts easily under seats or dashboards. It integrates smoothly with both aftermarket and OEM setups, providing reliable signal boosting that audiophiles praise for punchier sound and tighter bass response.

Potential drawbacks include its 2-channel limitation, which might require parallel units for multi-amp builds, and the need for some electrical know-how during install. Still, these are minor for DIYers or pros.

Overall verdict: A top-tier choice for clean, powerful signal conversion. If you're amplifying a factory system, the LC1i delivers professional results without compromise.

Active 2-channel line driver/output converter for aftermarket and factory systems.

Speaker-level inputs: Up to 40V (400 watts RMS).

Output: Up to 9.5Vrms.

Auto turn-on: DC offset or audio detect.

Load selection: 20, 60, or 20,000 ohms.

Features level control and maximized LED indicator.

The PAC SNI-35 Variable Line Output Converter is designed for car audio enthusiasts who want to upgrade their sound system by adding an aftermarket amplifier to a factory radio. It takes high-level speaker outputs from head units rated 2 to 50 watts per channel and converts them to low-level RCA signals, making it a must-have for retaining your stock radio while enhancing power and clarity.

Standout features include adjustable sensitivity from 2W to 40W per channel, ensuring the output matches your amp perfectly without distortion. The built-in audio transformer provides complete isolation between input and output circuits, effectively eliminating ground loop noise that plagues many installs. It delivers a linear response from 20Hz to 20kHz, maintaining correct phasing for accurate stereo imaging and full-range performance.

Build quality is solid with a compact footprint of 1.2 x 6.25 x 5.9 inches, allowing easy mounting behind dashboards or in tight spaces. The phase-adjusted design and noise-free operation shine in real-world use, providing clean pre-amp signals that amps love, though setup involves tweaking the gain dial for best results.

Drawbacks are minor: it is stereo-only, so multi-channel systems may need multiples, and very low frequencies under 20Hz get attenuated. Overall, the SNI-35 excels as a reliable, budget-friendly bridge for factory-to-aftermarket upgrades, earning strong recommendation for DIY installers seeking professional sound without hassle.

Channels: 2-Channel Stereo

Input Power: 2-50W per channel (adjustable 2-40W)

Frequency Response: 20Hz - 20kHz linear

Output: Stereo RCA pre-amp signals

Dimensions: 1.2 x 6.25 x 5.9 inches

Key Tech: Audio transformer isolation, phase corrected

The AudioControl LC2i is a 2-channel line output converter designed for car audio enthusiasts who want to enhance their factory-installed head units with aftermarket subwoofers, amplifiers, and processors. It converts speaker-level signals up to 400W per channel into high-quality RCA pre-amp outputs, allowing you to keep your OEM stereo while unlocking superior sound.

Standout features include AccuBASS processing, which actively corrects bass roll-off that occurs when cranking up the factory radio volume, delivering fuller lows in real-world driving scenarios. Variable and fixed outputs with discrete level controls provide precise audio tuning, while GTO signal sensing and remote out make integration straightforward for powering downstream devices.

Build quality shines with a slim chassis measuring 5.4 inches long by 3.25 inches deep and 1.5 inches high, complete with integrated mounting brackets for hassle-free installs in cramped car interiors. It retains factory volume and steering wheel controls, preserving your vehicle's conveniences.

Potential drawbacks include no fader control support with multiple amps and the need for a separate ACR-1 remote for dash-mounted sub adjustments. Still, these are minor for most single-sub setups.

Overall, the LC2i earns high marks for reliable performance and ease of use, making it a top choice for clean factory-to-aftermarket upgrades. If you crave better bass without a full stereo swap, this converter delivers exceptional value.

Channels: 2-Channel

Max Input Power: 400W per channel (speaker-level)

Outputs: Fixed and variable RCA pre-amp

Dimensions: 5.4”L x 3.25”D x 1.5”H (6.5”L with brackets)

Turn-On Modes: GTO signal sense or remote 12V input

Additional: AccuBASS processing, optional ACR-1 remote compatible, remote out for 2 devices

The NuIth 2-Channel High to Low RCA Converter is a wiring adapter designed for car audio enthusiasts who want to add amplifiers or subwoofers to factory stereos lacking RCA outputs. It converts high-voltage speaker signals to low-voltage RCA lines, making it essential for upgrading stock systems in vehicles without built-in pre-outs.

Standout features include high-conductivity copper wires for clean signal transfer, support for up to 50W per channel, and a blue remote turn-on wire that automatically powers your amp when the stereo activates. Real-world performance shines in easy integration, delivering improved bass and clarity without distortion, though users must wire correctly to the ACC for proper shutoff.

Build quality is solid with stable connections and a neat plug design, ensuring reliability during installs. It's compact, universal, and follows simple steps: match speaker wires to color-coded inputs, connect remote, and link RCAs to the amp.

Potential drawbacks include the 50W input cap, which suits most stock setups but not extreme power, and precise wiring needs to prevent issues like constant power draw. Overall, this converter offers great value for seamless audio upgrades.

Verdict: Highly recommended for DIY car audio installers seeking an affordable, effective way to boost their system. It transforms basic stereos into powerful setups with minimal effort.

Channels: 2-Channel

Input Power: Up to 50W per channel

Conversion: High-level speaker wire to low-level RCA

Includes: Remote turn-on wire (blue), color-coded speaker inputs

Compatibility: Factory and aftermarket stereos

Installation: Tap into speaker wires, connect to amp inputs