I'm not a doctor, but..
If the sound coming from the EVSE is a 'hum' and fairly quiet in a quiet garage, then it might be normal. There are a number of torroid chokes, transformers, low-current DC converters, and other inductive parts in the EVSE that will vibrate with the alternating current.
If you put your ear to your laptop power supply, you can hear a hiss, buzz, or hum. When the room gets quiet enough, just about every electrical device makes some kind of noise.
My solar inverter, for example, is called "silent" with no fans or moving parts, but on a hot day in the quiet garage, you can hear the inverter working feverishly and sizzling away with high-current switching action.
Anyway, if the EVSE sound is louder than quiet, or 'raspy', I would be concerned. Get your nose near it too.. if you smell anything "hot" or baking, be concerned.
And yeah, if it's significant enough to post about, I'd call AV and ask them to come check it out regardless.