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I have a behringer eurolive b115. This is a 15 inch active 1000w speaker.
ie has its own amp in the speaker.

When I turn it on all the light light up as normal then after 2 seconds the
speaker squeaks then the light go out briefly then the process repeats.
Lights on, 2seconds then a squeak, lights out.

There is an earthing screwed to the rear panel of the speaker. Around the
earthing there is burn marks. Only Accessed by removing the rear panel





Are you sure those "burn marks" are not the weld marks around a welded on
screw tapped ground point?



Gareth.