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Hk pro8a power issue


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I have a set of HK Pro8a active speakers which I use for front fills on a show I do using each one powering a passive one , one has suddenly lost power last night, I have checked both internal fuses and they are ok yet it won't power on, Has anyone come across this anywhere or could it be the amp module has suddenly failed, they get very light use and are properly flight cased.

Does anyone have any ideas of what to check or where I can get replacement parts from if needed as I can't find any info anywhere 

Many thanks in advance 


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