Quote:
Originally Posted by markpetrakis
It looks like you might have welded shut the small pipe in the hemholtz chamber?? Is that normally an open pipe or just a small off shoot to reduce sound?
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The pics from above are not mine .
I've done the "2 big pipe replacement" in the absorption chambers (middle-sections 5-6) =>
https://www.m3post.com/forums/showthread.php?t=733817
The mod. in the Helmholtz chamber 1-2 is the straight through mod. (ACM-mod)
ACM is louder , and will drone . Because the Helmholtz chambers are deleted by the straight through pipes 3-4 .
1-Drawing to look inside ..
2-Pic below shows the ACM mod.