Back in the summer of 2017 I wanted to test a common rule of thumb: mass loaded vinyl should always be decoupled from nearby surfaces, and closed cell foam is the right material to do it.
Many of you kindly donated materials for this experiment and I am very, very thankful for it. I am thrilled to finally finish and post the results. This took a very long time to write because I did not have a solid method to interpret the results until just recently when we covered the transmissibility ratio in an acoustics class I'm taking. I apologize for the delay, but I hope the wait is worthwhile.
the report is at my dropbox here --> MLV decoupling report v1.3