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Dear Wayne, I've now got my drivers for the two pi towers, and I have obtained some 1" thick fine layer ply for the cabinets. The next question is what would be the port size for this thickness. Sorry to mess up your design but the ply was a very good deal, ie free. I know they will be heavy, but I'am a big lad. Many thanks, Colin
I built mine a little thicker and had the same questions. I grossed up each of the dimensions so the internal volume of the cab was the same, and the length of the port on the plans is from the front of the baffle to the back of the tube, so you just make the tube a little shorter. Good luck!
...but I guess the port hole in the back will have to be slightly bigger.
Go with 5" diameter port for 1" thick baffle
When building tower two π speakers with a 1" thick baffle, you can cut a 5" diameter hole for a port and expect good results.