Hoping someone can help with an in-wall speaker installation question. I'm trying to figure out how to appropriately size custom-made backboxes for in-wall speakers, when the mfr doesn't offer backboxes for this particular model, nor sizing (that I can find). I'm going to try and call them directly during the week, but don't know what help I'll get. My local stores offer some generic boxes, but I'm sure there's some science/math to this and I'd like to get as close to optimal as possible. Any help very appreciated! I have 6" deep studs on the walls and ceilings where I'll be installing these and it's new construction, so I have nearly unlimited flexibility in sizing the boxes.