Quote:
Originally Posted by Lindt
Phoebe3
Just saw your post. Did you install the Onan resonator or something else? Do you feel you had a significant noise reduction? Did you measure dB before also? Onan claims only a 1 dB reduction but You Tube video I saw sounded like more.
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I did not test before installing the resonator and I used a NIOSH app on my iPhone to perform the test so the readings might not be very accurate. To my ears, I'd say it cut the volume by about 20%. Additionally, the tone was lower so somewhat less irritating.
The resonator/muffler came from Amazon (Cummins Power Generation 155-2449). The cost was about $46 and we paid a welder to put it on so total came to less than $100. Negative Amazon reviews seem to stem from folks who used the slip-together technique rather than welding.
10 Feet away = Onan 65 db; Van engine 62 db
50 feet away = Onan 51 db; Van engine 48 db
Recorded 12/2017 after putting resonator on. Readings taken from passenger side. Onan exhausts from driver’s side but our neighbor's house is there so I couldn't get a reading.
We are considering adding another one or a baffle on the end of the generator tailpipe. Would be great if it was no louder than the van engine.
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