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Discussion Starter #1 (Edited)
Building a small structure adjacent to the main house.

This source shows STC data for various wall types, but doesn't help me understand how effective it will be below 125 Hz.

http://www.toolbase.org/PDF/CaseStudies/stc_icc_ratings.pdf

I'm building a double walled structure, and plan on on inner wall of 3/4" OSB, green glue and 5/8" drywall.

For the main structure outer wall, I was planing on conventional stick walls with standard fiberglass insulation.

Since mass is a key to soundproofing bass (by lowering the resonance frequency of the wall) would a switch to cement block outer walls be substantially more effective to reduce bass transmitted to the main house, located a few feet away?

Another suggestion was filling a wall with sand, but I would be concerned with 1) moisture absorption and mold, and 2) sand leaking out.
 
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