There's probably a simple answer to this, but it's been bugging me for the last few days so I thought I'd ask. People seem to make a great fuss out of sealing the smallest cracks and gaps to prevent sound transmission and it does seem to make a big difference, but I can't work out why. Imagine the scenario, you have a room (a cube) with only three walls, all prefectly absorbing. There is a sound source in the middle of the room. The amount of energy that leaves the room is 16.6% of the radiated energy (therefore 20dB quieter). In a well insulated room where a gap is, say 1/1000 of the overall internal surface area of the you would expect the energy that passes through the gap to be only 1/1000, and therefore inaudible at normal volume levels Why doesn't this seem to be true? Is there a very high level of reflection of energy that increases the point energy so it does not follow an inverse square decay from the point of creation (this is obviously true to some extent) If so, does controlling reflections through absorbtion in the room, also correspondingly improve soundproofing outside? why do I spend my time wondering about these things?