External pump noise???

mng777777

Shark Wrangler Wannabe
Does anyone have any ideas about how to quiet an external pump? It is mounted to a piece of 3/4" plywood which is mounted to the base of my stand. There is 1/2" cellcast foam between each piece of wood to insulate and I placed rubber grommets between the screws and the wood to insulate and yet I am still getting more noise than I would prefer. Are there any other tricks to quiet it some more?
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it's the hum of the pump. I have gotten rid of all vibration noise. I appreciate your advice. I will try to add some foam to the inside of the stand when I put the doors on.
 
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