Hi guys was wondering if I could get your opinion on an issue. I've just emigrated to Australia from Ireland and have recently just got my furniture shipment from home. I've been pretty busy and only recently unpacked my music gear. I plugged in my trace Elliott combo for a quick play and noticed that that there was a slight buzzing/hissing coming from the amp. I also noticed that when i put my hands on the bass it went away. I had bought a second hand fender jazz in oz when I arrived to keep me busy so I kind of assumed (stupidly with hindsight) that this was the problem. Naturally enough I assumed it was a grounding issue and cracked open the bass and did the usual shielding, soldering etc. This did help somewhat but the noise was still there and was still annoying me. I then tried my p-bass the hiss was still there! I then assumed it was the amp or cables. I checked all my cables and they seem fine though the noise was less on my more expensive ones. Assuming it was the amp I then set up my Hartke rig only to discover the noise is still there!!! Out of annoyance and frustration I then went through my other basses. When I got to my stingray (my only active bass) the noise was completely gone. Experimenting I put my passive basses through the active input - no noise at all!!! I've no idea what the problem could be. It occurred to me that it could be a discrepancy in the amps power usage - though my hartke rig was bought in australia (i lived here before for a year whilst my wife was training) so that would seem to rule that out. The only thing that occurs to me is that the house wiring. We are renting until we can sell our house in ireland and the landlord had some problems with dodgy builders apparently. Is this even possible?? it probably seems stupid - as the solution is just to plug into the active input and the loss of volume won't be an issue on a 500w rig- but this sort of thing just annoys me! Plus I had to leave my band to come here so its not like anybody else is going to notice!! Any advice/insight would be very much appreciated.