How to soundproof your interior walls, floors and ceilings

I am a voice performer for documentaries, corporate presentations, and commercials. A major requirement of voice recording is to have a recording environment that is as silent as possible. My voice recording booth, weighing approximately 1,000 pounds, is insulated with ROCKWOOL Safe'n'Sound® in all four walls, the ceiling, and the floor. Other than one other voice booth—the very expensive, anechoic chamber at the US Military Academy at West Point—it is the deadest space in which I've ever recorded. The installation of the Safe'n'Sound® was just as simple and easy as shown in this video. Thanks for an extraordinary product.

this is the shortest and worst tutorial for this insulation ive found, and its from the official brand of the said insulation lol

Why is it thinner than a 2x4, and have less material, but yet more expensive than standard rockwool insulation?

I'll pppp

Understood

rockwoll doesnt do dick for low frequency

Chat is this stuff legit?