CNC machining. I showed it to my instructor last night and he was like haha this thing is definitely a Frankenstein.Can you summarize what you have done so far and how effective each step has been?
As you may notice, I am a bullet point type of guy!
What are you studying?
In the garage you have sound reflecting off floor, walls and ceiling. For the single sheet of plywood to be effective it would need to be 2x or even better 3x the size of the sound source and have no reflection back to your mic. I mentioned it as part of SAR testing on a generator placed 100' from a work site, with no reflection sources. Try it outside. Not really practical for your application anyway.<SOME SNIPPED>
* Lined inside of panels with felt = ~5dB reduction
* Quick check placed a 1/4" plywood board on free facing side = ~0dB reduction
This reduction is according to my video editing software and an approximation. 5dB is barely noticable to the human ear but I guess if you are really paying attention to it you will pick up the difference...
Quick idiot test. I put a plywood board infront of generator with felt on inside. With and without board. Notta