I have two single coil pickups in my bass (the jazzbassickups in a humbucking casing, 35j) And I noticed that when I play my bass over a studio monitor or any other hifi kinda cabinet I get a bit of distortion on the low E-string. I 1st though it would be the preamp, but no, it isn't. Also the pickups are far enough away from the strings so that can't be the problem and I also run them on 18 volts (with new batteries). Adjusting the volume or gain on both bass or amp doesn't solve the problem either. Does anyone here have the same problem?