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Welcome to our new Site We are adding some final touches. For other T-harnesses Options please visit Thank you
Welcome to our new Site We are adding some final touches. For other T-harnesses Options please visit Thank you

4-Channel LOC w/Summing and Remote

When it comes to adding an amplifier or amplifiers to your factory audio system, the link4 does what models from competing brands just can’t.  Simply put, it is the most flexible 4-channel LOC available today. 

The link4 can directly accept 4-channels of input and give you 4-channels of output.  It can accept 2-channels of input and give you 4-channels of output.  If you input 4-channels, you can sum them down to 2-channels of output and pass through another 2-channels for retained sub level control.  It even has a 3.5mm Auxiliary Input so you can add your phone or other portable device to the system.  No other 4-channel LOC can do all of that. 

As an added bonus, it includes our "Patent Pending" Multi-Function Remote Level/Source Control that can adjust your subwoofer output level, the volume of the auxiliary source or serve as a Master Volume Control for your entire system.  This is especially useful in OEM systems where speed sensitive volume dependent equalization is present.


link4 Features

  • 4-Channel Line Output Converter

  • 4-Channel Summing Processor (4-in/4-Out)

  • Multi-Function Remote Level/Source Control

    • Master Volume Control

    • AUX Volume Control

    • Independent CH3/4 Level

    • Source/Function Select

  • AUX 3.5mm Input

  • 2ch or 4ch Input Select (Direct, Copy or Sum)

  • 2-Way Summing w/Retained Sub Level Control

  • Differential Balanced Inputs

  • Low Impedance Outputs

  • Variable Gain Adjustments w/Clip LEDs

  • Auto Turn-On via DC-Offset or Audio Signal Detect

  • Generated +12V Remote Output

  • OEM Load Detect Compatible

  • Locking Detachable Power/Speaker Input Terminals

  • Professional Grade Panel Mount RCA’s

  • Compact Aluminum Chassis w/Detachable Mounting tabs

link4 Specifications

  • Output Voltage (Max) ------------ >10Vrms

  • Output Impedance ----------------- <50Ω

  • Input Sensitivity

    • SPK ----------------------------- 2-20Vrms, 4-40Vrms

    • AUX ----------------------------- 0.5-5Vrms

  • Max Input Voltage (SPK) --------- 40Vrms

  • Frequency Response -------------- <10Hz to >100kHz

  • THD+N (SPK/AUX) ------------------ <0.05% /<0.05%

  • S/N (SPK/AUX) ----------------------- >114dBA />115dBA

  • Turn-On Trigger -------------------- +12V, DC-offset & Audio Detect

  • Generated +12V Output --------- >500mA

  • Chassis Dimensions ---------------- 1.1”x3.5”x5.2” (29x90x133mm)

All LLJ products have a 5 year warranty.


Our designs are not just original they are both cost effective and durable.


We work very hard to be original and design products that look nice but are affordable. Unfortunately some have taken advantage of our designs to over charge.

Because we know you wont need it

But just in case you do its there.

Function meets quality

We believe everything you buy should be an investment. With this in mind me manufacture products you can reuse .to maximize your investment.