I live in an apartment, in which the doorbell emits an unreasonably loud tone (kind of square-wave-y) continuously and at constant volume for as long as someone has the button depressed. Since people buzzing me from the complex's front door have no feedback that the bell is actually working, they tend to press it multiple times and for a long time; this gets to be very annoying.
I would like to figure out a way to dampen the bell's sound. Since I do not own the property, I cannot replace or alter the bell in any way, so I'm looking for non-invasive ways of quieting it down. I'm not really concerned about aesthetics; if I need to make the thing look like a Lovecraftian horror to quiet it down, so be it.
My first instinct is to purchase some acoustic foam (like this) and tape it over the speaker; does that seem like the kind of thing that would work?
Here is a photograph of the thing for reference: