• 4-Channel High-to-Low Conversion – Convert factory speaker outputs into clean RCA signals for aftermarket amplifiers with selectable 2ch/4ch input mode.
• Selectable Input Impedance – Choose between 20Ω, 60Ω, or 20kΩ to prevent OEM errors and ensure compatibility with a wide range of factory systems.
• Automatic Amplifier Activation – Auto turn-on via audio sensing, DC offset, or remote trigger for simple, reliable power-up without extra wiring.
• Noise-Free, Durable Design – Anodized aluminum housing, surface-mount components, and selectable ground isolation reduce interference and maximize clarity.
• Wideband Audio Performance – Delivers 10Hz–20kHz frequency response with <0.01% THD, >110dB SNR, and up to 11V preamp output for crystal-clear sound.

4-Channel High-to-Low Line Output Converter with Remote/Automatic Turn-On MTLOC4

This Listing Includes:

• (1) 4-Channel Line Output Converter MTLOC4

The MTLOC4 is the perfect solution for integrating factory head units with aftermarket amplifiers. It can convert four channels of speaker-level outputs into clean RCA signals.  It gives you full system expansion without compromising sound quality.

With selectable input impedance (20-Ohm / 60-Ohm / 20k-Ohm), the MTLOC4 ensures compatibility with a wide range of OEM systems while preventing errors. It's automatic turn-on via audio sensing, DC offset, or remote - activates your amplifiers seamlessly without extra wiring.

Engineered with an anodized aluminum shell, surface-mount technology, and advanced noise rejection, the MTLOC4 guarantees reliable performance in a compact design that's easy to install. Delivering a wide 10Hz - 20kHz frequency response with less than 0.01% THD, it preserves the clarity and dynamics of your music.

Features

• 4-Channel High-to-Low Conversion


• Selectable Input Impedance: 20-Ohm / 60-Ohm / 20k-Ohm


• Auto Turn-On: Audio Sensing, DC Offset, or Remote Trigger


• Selectable Ground Isolation (200-Ohm / Isolated / Grounded)


• Selectable Input Mode: 2ch or 4ch


• 10Hz - 20kHz Frequency Response with <0.01% THD


• Rugged Anodized Aluminum Housing for Noise Rejection


• LED Indicators for Power and Clip Monitoring


• Compact Design for Easy Installation

Specifications

• Maximum Speaker Input: Up to 40V (400W RMS)


• Maximum Preamp Output: Up to 11V


• Nominal Conversion Ratio: 4:1


• Frequency Response: 10Hz - 20kHz


• THD: <0.01%


• Signal-to-Noise Ratio: >110dB


• Input Impedance: Selectable 20-Ohm / 60-Ohm / 20k-Ohm


• Output Impedance: 100-Ohm


• Power Draw: 130mA


• Recommended Fuse: 1A


• Weight: 10.4 oz

Additional Features

• Bass Boost: No


• Auto Turn-On: Yes (Audio Sens / REM / DC)


• Remote Output: Yes


• Level Matching Controls: Yes


• Dash Remote Level Control: No


• LED Indicators: Power / Clip


• Housing Material: Anodized Aluminum / Black Finish


• Wiring Connector: 14-gauge Quick Connector


• Ground Isolation: Selectable (200-Ohm / Isolated / Grounded)


• Step-Down Method: Transformer


• Input Selector: 2ch / 4ch

Dimensions

• Length: 5.7" (145mm)


• Width: 3.5" (88mm)


• Height: 1.1" (28mm)

Why Choose the MTLOC4?

If you need to add amplifiers to your factory system without replacing the head unit, the MTLOC4 is the ultimate integration tool. With selectable impedance, ground isolation, and auto turn-on features, it makes amplifier installation simple while delivering pristine audio.

Take your system to the next level with the MTLOC4 High-to-Low Converter—built for clarity, reliability, and seamless OEM integration.

Upgrade your factory system with the MTLOC4 for cleaner, more powerful audio!