Anecdata, but for 2 years I have had a Chromecast Audio and a cheap Creative 2.1 system about 20cm away from my microwave, which is the type where you can just

Anecdata, but for 2 years I have had a Chromecast Audio and a cheap Creative 2.1 system about 20cm away from my microwave, which is the type where you can just open the door to stop it. No problems so far. Don't microwave ovens in large part depend on standing waves (resonant with the chamber size) to deliver the power levels they do?