One speaker hums and stops when touching back of speaker

One speaker hums and stops when touching back of speaker

Justin Gad

One speaker hums and stops when touching back of speaker

I have a pair of Sdj-80x speakers connected to a djm-250mk2 and I'm having a problem that when I switch them on I get a humming sound from one of my speakers which stops when I touch the back (weird).  I've switched the cables around and the same speaker still has the problem.   I'm using XLR cables. 

Appreciate any help.

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