Ableton Forum

Support didn't mention this, but I am interested in whether headphones with low ohms, like the Audio Technica M50x which are 38 I believe, could be the problem.

The headphone output impedance on the Push 3 is 10Ohm. If it's just a matter of using a higher impedance headphone, then maybe it's not a ...

I tried a grounded power supply and it didn't fix the issue for me.

I tried three different headphones (Audio Technica, Bose, and Panasonic) on two different Push 3 standalones on multiple power outlets (Furman, surge protector, GFCI, and wall) in different rooms. All had the same headphone noise when the power was connected. No noise on the other outputs or inputs ...

Correct, when the power supply is connected I get faint noise through headphones. When I unplug it it goes away.

I was told that it might be a ground loop caused by the ungrounded two pronged power supply. But Ableton doesn't suggest any three-pronged one and advises only to use the supplied ungrounded one.

I'd like to try a different supply but haven't found one I'm completely confident matches the specs ...