If it becomes too quiet, you can jump up and see what the kids are up to. While this is a judgment call for any parent, once you've decided, the solution is simple. Glass and doors are the key. Doors are saviors. And they need to fit the ambiance of your home.
Doors divide, hide, insulate.
They define boundaries, create space. They also tune down most boom-box vibrations. Of all these functions, insulation from sound is extremely important. Glass in also an insulator. Used in doors, as side panels or dividers, architectural glass is most useful in keeping noise out.