Yeah, mounting depth can be a *****. All of the ones I listed should be under 6.5'' with the ixls being well under 6'' I think. My box is pretty much the dimensions I listed above and my lv4xl is 6.5'' deep with a 8.75'' motor width and it fits fine and has about an inch for the pole vent to breathe (will depend on how low or high you mount the sub on the box).