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Re: Add soundproofing insulation
Soundproofing/sound isolation is aimed at keeping theater sounds from disturbing other parts of the house. A natural upside to that is that sounds from outside the room don't enter, so that lowers the noisefloow in the theater space which is an improvement to performance. But no, this is a very distinct question from treating the interior of the space acoustically so as to control the sound within the room when you actually watch a movie. They are two very distinct tasks.
Sound isolation is mainly concerned with wall structures and mass and sealing the room up and isolating it from the rest of the structure.
In-room acoustical treatments is concerned with treating the surfaces of the space with absorption and diffusion mainly to control the sounds that go on inside the room.
Each of these tasks can be done on their own, or they can be done together. There can be some blurring when it comes to bass and the nature of the wall structures, and isolation can both help and hinder in-room acoustics in the bass arena, depending. But generally speaking they are two completely different tasks. As an extreme example, if you built a big giant cinderblock walled and cement ceilinged room, it would be extremely well isolated and keep sounds in(or out), but left like that the interior would sound hidiously terrible as you could imagine with all that bare cement which is extremely reflective.
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