exchange a m2 studio for a m1 studio

There are many theories about why some models seem to make noise. One of the most compelling suggest the noise is a whistling sound (like a flute).

https://basicappleguy.com/basicappleblog/the-case-of-the-singing-studio

The author suggests you tape over the part of the grille that wraps around onto the sides for instant relief.

If you look closely at the online picture of the M2 studio, they redesigned the rear grille so that it no longer wraps around onto the sides, eliminating the opportunity for that reverberation.