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Old 5th January 2018
  #5
Here for the gear
 

Same for me, except its the left speaker (SM9-L)

Again, tried everything - different cables, with/without power conditioner, seperate circuits.

Cannot seem to get rid of the hum - 50hz, my scope confirms it (Australian power).

Interestingly when I press my ear against each cabinet the hum of the electronics inside (transformers) is different.

I'm sending mine back to my dealer.