Quieting a Generator

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Road legal limit is 74dB. [1]
Duromaxx 10kW is already 72dB and going down to 45 db at idle. [2]
Just deflector - https://www.youtube.com/watch?v=5zwc5mdEbDI . Sound does not come only out of the muffler.
Baffle box - https://www.youtube.com/watch?v=DH4L1rTral4
GoBoard tile board - https://www.jm.com/en/home-insulation/tile-backer-board/goboard/
85 to 75 db - [3]

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