How are you connecting the headphones to the Mac?  Via bluetoothdirectly or an 
adapter.

> On Jul 14, 2016, at 6:28 AM, Martin Brown <mbrown.bro...@gmail.com> wrote:
> 
> I have tried to use a set of wireless headphones on my Mac Mini, but get a
> constant hum in the background. I have tried them on my Windows machine and
> my wife has tried them on her iMac, and in both instances they perform
> flawlessly. Just wondering if anyone might suggest a possible cause, and
> even better, a possible fix.
> Martin  
> 
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