OBP-3 Treble issue
I have installed the new super singles from Aguilar and their OBP-3 preamp on my bass.
Now, I am experiencing a problem with treble. If I control bass or middle the changes are very sensitive, tone is changing as it shall, but not the same with treble.
If I roll the treble pot from 0 to + or to -, there is very small difference in tone, almost none.
I tried to put all on flat, also the blend of pickups, I fell that the treble is low. Also, when turning it from 0 to + direction, some hum appears, like the sound of the fan when the laptop heats up.
Wiring is ok, have checked it few times. I have tried with 9V and 18V power, no change. I haven't installed any capacitors or resistors.
Anybody has some experience with similar issues?