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Making your very own sound proof generator enclosure may become an enjoyable and gratifying endeavor. https://gumroad.com/4944055656656/p/acoustic-enclosures can be found readily at your neighborhood hardware shop or online. Here's a great list of substances which can be used plus some facts about these...
Mass Loaded Vinyl
Wonderful Sound reducer
Frequently Used on the outside of a good soundproof shed
Is tough and durable
Could be layered
Could be painted for a more decorative look
Once implemented, gaps Will Need to be caulked or metal tape used for effectiveness
Medium Density Fiber Board (MDF)
Used for the walls of the enclosure
Preferred over plywood because it passes less noise
A few are moisture resistant
Some Kinds are flame retardant
Adaptive and could be curved or shaped
Cheap
Heavier