I am using a 12 by 24 foot room as a home studio and this room echos like crazy. Every time my guitar players and I jam or record the echo makes it sound like a bunch of jumbled notes. Some advice on what kind of studio foams or other cheap alternatives would be great, thanks.

hi,

I'm making some absorption panels ( 2' x 4' ) for home recording that i can move so not against a wall). I will you them mostly for vocal booth and for general absorption in my 'live room'. I want to use 2" rockwool panels ( good absorption AND cheap !)

absorption coefficient for a 2" rockwool panel are:

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