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I have a sono build that uses an Avalanche 18. The sonotube is 30" diameter and from bottom end cap to top endcap measures 54.5". The Length across the endcaps is 32".

Now I had my brother in law build this as I am terrible at DIY with no skills. So as of now I believe it's tuned to 16Hz. I'm wanting to lower the tuning to around 11Hz to 14Hz with the flattest response.

Forgot to mention I am using an 8 inch port (sonotube as well). The port now is 20".

What lower tune can I go to and still have a good response curve?

Thanks for any help!!!
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