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7 pins connector
Connect a 5k potentiometer between pins 2 and 6. 5k=Full Volume, 0 Ohm =Minimum Volume Note the odd pinout of a 7 pin DIN connector. Facing the amp, clockwise starting on the bottom left: 6,1,4,2,5,3,7 Pot connects to bottom left and top pins.

 

Pin
Number		 Pin
Name		 Description
1   Batt   Unused
2   Bass Adjust   5K Pot to Gnd
3   CMD CLK   Unused
4   Commander Knob   Unused
5   CMD IN   Unused
6   GND   5K Pot to Bass Adjust
7   CMD OUT   Unused 
          2

    4          5

 1               3

    6          7
Facing Amp DIN Socket

 
Pinout status: +4 -0
According to 4 reports in our database (4 positive and 0 negative) the Alpine Bass Knob for MRD-M300 and MRD-M500 Amps pinout should be correct.

Is this pinout
NO DIY devices
Alpine Bass Knob for MRD-M300 and MRD-M500 Amps visual pinout:click to enlarge
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