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This is great! I have that same speaker set and this gave me the inspiration to dust it off and deploy it at again.After putting the foam inside the sub enclosure, I was testing without the other speakers plugged in and noticed a rattling sound which I first thought was a loose component rattling inside. Upon further investigation, I figured out that it was some turbulence in the airflow through the port (not sure of the technical term for this). I'm not sure if it was present before adding the foam. I solved it by sticking a small scrap of foam into the port. I was using regular egg-crate foam rather than proper acoustic foam.