All the holes on the speaker were routed. - For the record this took 3 passes per hole. I used a 3/4" router bit to cut the outer seat, then used a 1/4" inch cutting bit with the router to cut the inner circle and create the hole. For the inner cut I cut 1/2" down, then another 1/2" down to get through the baffle. The holes of the inner brace were already cut before assembly and the front of the speaker is 1.5" thick. I highly advise you precut a scrap board and make sure you are cutting the holes the right size.

tiny | small | medium | large | xlarge | huge