Honda 2000 quiet box, I'm back!!
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28956619/srt/pa/pging/1/page/1.cfm Getting rid of the Toyota and bought a Roadtrek. First thing I did was take out the Onan and sell it. S...
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Call these guys. https://soundown.com/
They can specify a product they sell that will be thinner and provide similar sound absorption to the rockwool based on material testing (nice folks to talk to). They are also located in FL so in most cases, you will get one-day shipping for free.
Foam board is mostly worthless for sound absorption as it has insufficient mass. Drywall needs to be isolated from itself and other materials to get its full benefits using something like viscoelastic glue. Drywall also has a tendency to fail when it gets wet so unless you can keep it 100% dry it is a non-starter.
Sheets of metal have a tendency to resonate with the vibrations of a generator so make sure to use some product to dampen the resonation (you can put your foam/wool against it). On the plus side, metal has great mass versus its thickness and mass is what absorbs sound.
If you want to copy a working model so you know what you end up with will provide real benefit use the generator enclosures built for boats as your model. Specifically copy the ones built for Kohler 5e marine generators (sound shield). The Kohler units are gas motors running at 3600 rpm and are noisy as all get out. With the sound shield, you can actually seep in your boat. Their basic design is a metal box lined with sound-deadening foam (not the garbage you can get from homedepot or lowes).
You will still have the vibration transmission issue, but as you pointed out you are starting with a quiet model and it sounds like just trying to get a few more DB off the top.
They can specify a product they sell that will be thinner and provide similar sound absorption to the rockwool based on material testing (nice folks to talk to). They are also located in FL so in most cases, you will get one-day shipping for free.
Foam board is mostly worthless for sound absorption as it has insufficient mass. Drywall needs to be isolated from itself and other materials to get its full benefits using something like viscoelastic glue. Drywall also has a tendency to fail when it gets wet so unless you can keep it 100% dry it is a non-starter.
Sheets of metal have a tendency to resonate with the vibrations of a generator so make sure to use some product to dampen the resonation (you can put your foam/wool against it). On the plus side, metal has great mass versus its thickness and mass is what absorbs sound.
If you want to copy a working model so you know what you end up with will provide real benefit use the generator enclosures built for boats as your model. Specifically copy the ones built for Kohler 5e marine generators (sound shield). The Kohler units are gas motors running at 3600 rpm and are noisy as all get out. With the sound shield, you can actually seep in your boat. Their basic design is a metal box lined with sound-deadening foam (not the garbage you can get from homedepot or lowes).
You will still have the vibration transmission issue, but as you pointed out you are starting with a quiet model and it sounds like just trying to get a few more DB off the top.
