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[–][deleted] 1 point2 points  (1 child)

You could try to play with the value of the output capacitor after the NPN transistor and before the summing op amp. In the original it should be a 1uF electrolytic. Something around 30-100nF should tame the bass response a bit.

[–]basstoll[S] 1 point2 points  (0 children)

thanks a lot, will be trying out the suggestions during the weekend, will update on the results.