That is excellent. I love it! Wish I had thought of that.

Many years ago, when I was still living at home - maybe 1988 - I had my room soundproofed for recording purposes and instead of a sensible plan like this, I added an intercom instead, connected to the kitchen so I could ask folks to be quiet (and conversely, so they could let me know when dinner was ready)

Not the best plan if you are sneakily entertaining, and your guest's foot accidentally knocks the mic on, broadcasting out loud to the parents just what is going on...

Ahh - thems were the days!