Zone in with box dimensions
This app lets you zone in with box dimensions. Lock some dimensions or the volume, and play with the rest. Tips section contains some information how to evaluate performance of the box, some of which you might find relevant to your project.
Note that the dimensions do not consider panel thickness and calculated volume is for empty box from which you should reduce volume occupied by a driver and bracing and reflex ports, anything relevant to your project.
Zone in with box dimensions