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QSC K-12 powered speaker humming from speaker

Thanks in advance for any assistance I have a QSC k12 speaker and it has a humming sound coming from the speaker. Speaker buzzing with no input connected.
I have removed the large capacitors and tested them with multimeter. They were within tolerance. This is not an AC ground loop as I have other speakers that are working fine from same supply.
I am proficient in schematics but would like some help in diagnosing this one if anyone has experience here.
Thanks you and have a great day.

Comments
Bill
Bill picture

Very interesting,
I thought I was the only one to experience this. What kind of information did you receive to this post? I have (2) QSC K12.2 and one hummed and the other did not for the original time of ownership. Neither of them hums any longer... 

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