Adriaan..Thanks. Perhaps you can 'amplify' the answer for me as well. Your response serves me well if I already have a Series bass and detect this phenomenon. I am looking for a Series and am trying to avoid a complication that could be evaded up front, So, Are all Series basses subject to this condition, without regard to year model? Or are there certain (or approximate) year models that's are prone to this. For example, Series basses made after 1985 are not as apt to pick up the ancillary noise. Or, is it any given bass on any given day (or night) in any possible combination of scenarios? Perhaps no easy answer. Also, does the electronics upgrade make the basses sound differently than they did as originals out of the factory? Where I'm headed with this is a question I am working to answer: Do I pursue getting an older model Series, 1985 or older or look toward a newer model (in order to avoid the unwanted noise)? Thanks for the response....