not quite completely true. The cone also serves as an airtight rim. If you have your speaker in an inclosure, you want it to be air tight. Fingernail polish, posted above, or some silicone rubbed on is the only way to restore the air tight environment you need. Luckily they are 10's. 12's are more vicious and sometimes blow the sealant off.Super T said:... the surround doesn't do anything except act as a spring to pull the cone back to its neutral position.... luck!