the company is called "dynamat" and the product is dynil http://www.dynamat.com/products_architectural_dynil.html
It doesn't seam to show it there, but when my guy ( http://www.alsstereo.com/ ) instals it, he uses a 2x6 top and bottom plate with alternating 2x4 and 2x6 wall studs. He then weaves the product in and out and the drywall is attached to the 2x6 studs only. I didn't get the full explanation of that because I figured it would all be on the website, but I will bug him more about it next time I see him. I hate to take up too much of his time as I don't do all that much business with him and I know how the "free advice" thing can get old quick. I see him at the local builder association meetings and next time I'll make a point to sit by him during the luncheon.
Matt
The staggered stud technique is a classic move for bass decoupling.
It keeps the bass from penetrating the walls and then bothering the neighbors.
They used to sell a product that was lead/kapok that sound proofed very well, but was... lead and kapok, just the needed fuel for a toxic fire.
The rubber over the studs sounds interesting.
Anyone have more details ?