http://www.taunton.com/finewoodworking/Workshop/WorkshopArticle.aspx?id=29740
This is a video on building a 25 dB muffler for a shop vac. Here is the article:
"Veneer specialist Thomas R. Schrunk has found an easy solution to the noise generated by a shop vac. He constructed a box from 3/4-in. particleboard, lined it with acoustic padding, parked the vacuum inside, and shut the door. In this exclusive video, you can hear how much of a difference that makes.
Schrunk's box is as effective as many hearing protectors, producing a 25-decibel reduction in sound. That takes the vacuum down from a loud scream to a level below that of average conversation."
This is a video on building a 25 dB muffler for a shop vac. Here is the article:
"Veneer specialist Thomas R. Schrunk has found an easy solution to the noise generated by a shop vac. He constructed a box from 3/4-in. particleboard, lined it with acoustic padding, parked the vacuum inside, and shut the door. In this exclusive video, you can hear how much of a difference that makes.
Schrunk's box is as effective as many hearing protectors, producing a 25-decibel reduction in sound. That takes the vacuum down from a loud scream to a level below that of average conversation."