I think your box size is fine. The SA-8 v.2's arent recommended for any more than .75 cu ft ported. You are right there. If you plan on running more than rated power I would even consider shrinking the box a bit. I wouldn't go any larger at all. It is not needed
More power= Smaller box, a larger box will actually damage the subs. I saw a guy on here that put his Sa-8's on too big of a box at higher powers and completely inverted the cones.
More power= Smaller box, a larger box will actually damage the subs. I saw a guy on here that put his Sa-8's on too big of a box at higher powers and completely inverted the cones.