need more middle frequency from Blackface module

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ilearn

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My Blackface mod has good high and bass, but not much of middle.
It came with couple of orange drop caps(I got an used one).
They looked the stock values according to the component spreadsheet.

If anyone can give me an guidance how to increase middle, I'd appreciate it.
 
There are two things you can do.
1. Decrease the value of R31 to 67k or lower.
2. Increase the value of the mid pot to 50k.
 
Decreasing r31 would be super easy. All you have to do is piggy back another resistor on to it. Just use a parallel resistor calculator to find the correct value.
 
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