A few years back i'm sure i found a company that supplies "sounder diaphragms" to enable an enclosure with an internal sounder to emit that sound but remain "sealed". However, my GoogleFoo is letting me down and i can't seem to find anything similar now!
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/facepalm.gif)
Anyone used something similar?