I´ve found several measures I made on the meanwell output.
Background:
In another forum a user heard annyoing noise from his speakers, record it with a app, was something about 900hz..1khz.
He used the meanwell supply for an switching audio amp.
This supply was so cheap that I´ve decided to buy it just for measuring..

And indeed, I could hear the noise too, coming out of my speakers (where also a switiching class d amp is working) and from somewhere on the supply pcb.
Connected scope to the output of the supply, for measuring ripple and output current flowing into the amp.
And shoot...ripple got a frequency of 914hz, current also.
Then measuring with resistor load, the more current flows, the less you´ve heard a sound, the less the amplitude of the ripple and the ripple frequency increase to a not hearable range.
The used meanwell is designed to deliver full current all the time for industrial purposes, not for audio ones..

I actually guess the noise you hear is coming from the mains switching supply.