Sound deadening material outside speakers

porthole

Retired
I am thinking of trying to minimize the "sound intrusion" into the bedroom from the external speakers.
You can see behind the dresser drawers that the outside speakers are exposed.

My idea is to somehow seal up that area, maybe with an acoustical mat or similar.

Then hopefully with minimal exterior speaker noise in the bedroom adding a speaker switch and some type of speakers for the bedroom.

Any ideas of a way to block the sound from outside?
 
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