Right, I have some 68mm drainpipe as per the Basschat micro cab & easy build 12” cab, so I’m going to pop a round port in the front, and block up both slots at the front, flush with the baffle. But, I will leave the internal walls in place.
By these calculations, I have just over 43 litres (not taking in to account the derrière end of the driver).
What length port (64mm internal diameter) would tune this bad boy to a usable frequency for the Beyma 12CMV2?
Highly technical drawing: