I do want to install various soundproofing improvements in an apartment, but when equipment and materials indicate the level of isolation, I really cannot judge at all the difference between them. I saw many charts of hearing db scale but those are really rough approximations, and If I'm correct, db scale is logarithmic, meaning for me that small differences can have huge impact or, oppositely, huge differences can have small impact when I move toward the biggest numbers or towards 0.
So, for instance, last thing I was looking into was the entry door. Many announce about 36-39db where others, usually more expensive says 42db.
But what is the difference between 36 and 42db ? Can I hear the difference clearly ?
Can I "test" or "emulate" that somehow ?