Mineral Fiber Insulation
The best way to tighten up a room's sound and make it more soundproof in the process is to design it right, build it tight, and make partitions as dense as possible.
That's where specialized and imported Mineral Fiber comes in. It yields much better bass trapping, overall absorption, thermal characteristics, moisture absorption, and sound isolation.
If you want to make your place the best it can be, you must give consideration to Auralex's Mineral Fiber.