T-nuts ****, drywall screws strong enough?

[THUNDERBIRD 10+ year member]

pry the speaker up enough and use a hack saw and cut the bolt out

 

[TPABlazer 10+ year member]

On my old enclosure, I used t nuts. First time thru, one t nut pused out of the mdf. Take the sub out, and glue it to the wood. going thru again, and one never tightens all the way. Stripped the mdf out. BY HAND, with a very fine thread. To get it out I dremeled the head off and pushed it thru.