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Mike

In article ,
says...

Been doing some checks. Each section of the stand (made from Speedframe)
does seem to be electrically insulated from others - due to the plastic
sleeves in the joints. Even although the joints are made of steel.

So what we effectively had was two bits of approx 6" long 1" square tube
bolted to the mounting brackets of the X/O, and making a reasonable
electrical connection. Forming if you want an 'H' shape. Wonder if this
was acting like an aerial? Picking up gawd knows what, of course.

I used to have a Behringer analogue mixer which had poor RF protection
on the mic inputs. Had to add ferrite beads and a few pFs. So perhaps
that's a design feature of Behringer kit.

--
Take the dog out.