Juan fretlessbass

Hi all,

I have a similar problem with obp1, Los potentiometers vol., Bass and treble are 25k and my capsule is a emg dc40.and no sound nothing.I discovered recently something strange when I connect the input jack half sounds low but very weak and distortion, when I connect the plug to complete this does not sound jack.Now I just try another jack stereo and has not been solved so I've connected diagrams according aguilar.PLEASE HELP