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. Would this be a more substantial way of building a brace for a pair of 4Pis. Do the oval cut outs look like they will allow enough airflow?
I did something similar when I built my Cornscalas a couple of years go. As you can see, it also makes an ideal way to support the horn and driver, and in the case of the 4Pi a nice platform to lay the insulation on. Mind you, the Cornscala Brace pictured above has a larger footprint than the 4Pis will have... 13.5" deep x 23.75" wide, with 5" x 9.5" ovals.
That will work just fine.