That cheap foam on Amazon

 

Details of our foam vs hemp felt tests.

OPEN CELL FOAM, found here

 

 

VS

"Dope Felt", made with 100% Hemp fiber

 

1 Layer results-

 

 Baseline Waterfall image

 

2 Layer Test-

 

Decible reduction points

 

3&4 Layer Tests-

 

 

 Testing Equipment

This is the monitor I used

JBL LSR 308

 

This is the mic I used;

UMIK omni USB microphone

 

The software used for all tests and graphs

Room EQ Wizard

https://www.roomeqwizard.com

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