It's mostly a waste of money. As Doug said, in most rooms the issue is going to be controlling the low end. Foam does nothing for that. Corner bass traps would more likely be a better investment if you want to improve the sound you get when recording in a bed room.
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Jim
2023 Iris ND-200 maple/adi
2017 Circle Strings 00 bastogne walnut/sinker redwood
2015 Circle Strings Parlor shedua/western red cedar
2009 Bamburg JSB Signature Baritone macassar ebony/carpathian spruce
2004 Taylor XXX-RS indian rosewood/sitka spruce
1988 Martin D-16 mahogany/sitka spruce
along with some electrics, zouks, dulcimers, and banjos.
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