Grounding Problems

[Billminpa]

I need some advice concerning grounding issues. Last night I played an outdoor gig where the whole band had to use power from one outdoor outlet, Needless to say there were multiple extension cords. BOttom line is there was a tremendous ground hum, some in my amp some in the guitarists.
We don't play these types too often, but when we do I was wondering if there are any solutions to this issue.
Any advice would be welcome.
BTW, ground switches have already been used to no change.

[billfitzmaurice]

Originally Posted by Billminpa

I need some advice concerning grounding issues. Last night I played an outdoor gig where the whole band had to use power from one outdoor outlet, Needless to say there were multiple extension cords. BOttom line is there was a tremendous ground hum, some in my amp some in the guitarists.
We don't play these types too often, but when we do I was wondering if there are any solutions to this issue.
Any advice would be welcome.
BTW, ground switches have already been used to no change.

All is explained here:
http://www.rane.com/note110.html

[uglyrumor]

And you should never play without surge protection. You may not have a problem for years, but when you do....