I'm thinking about installing some larger in-walls such as Paradigm's SA-35, and going sub-less. I know, the horror. Anyway, According to the specs these are good for down to about 45 hz +-2db. Has anyone installed in-walls or in-ceilings and later had any type of structural or drywall issue? Would this be a concern? Then other option is a smaller set, like the SA-25, and try to find a place for a sub and wiring.