I have a Dean Edge Quilt top 5 string Bass with EMG HZ active pickups. It has a moderate hissing noise when plugged into amp. None of my other 6 basses do this. It is the same level no mater if I turn any knob up and down. I called Dean and they sent me a new preamp set and pots. The preamp has quick connectors so I unplugged and swapped preamp/pots for the active bass and treble pots that are self contained with the preamp. It seem to maybe be a little bit quieter if any but still doing it. Please help me figure out what this is.