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Thanks for the advice! It sounds like I need to do some rethinking. The box that goes into the hole is completely sealed in place so that no air can travel from the cavity into the room and doesn't touch the outer leaf, the box is then stuffed with rockwool insulation. I was under the...

Hi There, I am currently renovating my lounge and need to cut an inwall speaker into the inner leaf of my exterior wall. The house was built in the mid 70s and has a concrete block inner leaf. The speaker gets mounted into a box that is secured into the wall. The hole I need to cut is 435mm...