for some reason I could not muffle the lighthouse motors. I get the 220v amtek motors they can be muffled better. not quiet but only around 86 decibels. what I want to do is get a 220v whole house vac. the motors won't last any longer but they are around 65 decibels. they may last longer as I be they stray cooler. they will cost more to buy but then your have a very quiet enclosure. I can get one or two brush replacements out of them the brushes are about 10.00 for each motor.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1