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I still think this method will work for multiple ports, why wouldn’t it? You said your self you have used this method to check you calculations, and since you’re familiar with how to do it this way, then why not try. The cone excursion method will not lie, regardless of what math and theory say...

Yes you calculate, that doesn’t prove that the tuning is what the calculated target is, the method I described proves the outcome of the target, that’s why you cut the port purposely long because these programs are not that accurate. Doesn’t matter how many ports you have, using this method...

How to tune a vented enclosure. There is no way to exactly pre-calculate the exact length for tuning purposes. However I recommend that you download WinISD Pro (Freeware) and do simulations with the Volume of the enclosure and the Port Diameter, then when you get the Port Velocity under...