Changing the input impedance of a miniDSP 2x4 HD

[mbrennwa]

I have a miniDSP 2x4 HD, which has an input impedance of 10 kΩ on the analog audio input. I'd like to change that to a higher value. I am not very familiar with the miniDSP board, but I am hoping this can be done by swapping out a resistor at the audio input of the board. I couldn't find a schematic or any other useful information about the analog input section. Does anyone have an idea or a hint? Maybe even a schematic?

 

[scottjoplin]

Does anyone have an idea or a hint?

It would likely make it more susceptible to noise

 

[mbrennwa]

It would likely make it more susceptible to noise

I know. I still want to do it. Any ideas of the input section? Where to look on the board?

 

[scottjoplin]

If there is an accessible resistor setting the impedance you should be able to find it by looking at the PCB it should be close to the input socket between input and ground (0V)