before you go puncturing your dust caps with needels try this,it works great!
go get a vacume that has a hose attachment & hold your hand around the hose end keeping the hose from making direct contact with the speaker but allowing your hand to touch the speaker & act as a buffer.
if the dents are small they should POP RIGHT OUT if not you may have to work at it from different angles using various distances with the hose to increase suction as needed but in either case they should come out.
good luck.
mike.
go get a vacume that has a hose attachment & hold your hand around the hose end keeping the hose from making direct contact with the speaker but allowing your hand to touch the speaker & act as a buffer.
if the dents are small they should POP RIGHT OUT if not you may have to work at it from different angles using various distances with the hose to increase suction as needed but in either case they should come out.
good luck.
mike.