rritchey

Thanks everyone for your help. Much appreciated!

Found the drilled holes. From the front, the material of the surround extends past the holes covering them up. Looking from the back the holes are clearly visible. Unfortunately, they are slightly smaller than the bolts I bought. Back to the HW store.

Just received my IB318s (thanks!) but have a small question. There appears to be 8 mounting holes around the outside of the drivers but the holes only go through the rubber gasket, not the steel frame. Is the idea to drill through the steel at those 8 positions? I'm mounting them to the outside of a manifold that I have built with the cones firing into the interior of the manifold. My plan was to use t-nuts on the inside of the manifold with bolts holding the driver to the box. Does this sound like a reasonable approach?