So I have an Orange PPC108, that I put a super high-power speaker in (http://prvaudio.com/products/8mb500-ndy/). I'm getting some rattle on lower bass notes (around A-B). I'm curious if I could drill some holes into the back, since my hunch is that the rattle is air escaping (all screws are tight and I can't stop the rattle by holding onto any certain part while playing). I've heard that a center hole or 4 holes in the corners can be pretty effective. My largest drill bit is 3/8", so I'm guessing the 4 corner holes would make more sense. I prefer the sound of open back cabinets anyway, so I'm thinking even if it doesn't cure the rattle I would like the sound a little better with the holes. Is this a terrible idea? Is there a better way? Not that it matters but I am powering it with a Quilter Tone Block 201, these two sound amazing together. It is loud and lightweight! I'd just like to reduce this rattle!