How to Fix a Hole in a Speaker Cone


Holes can occur in speakers for any type of reason. The most common is that the material begins to loose its elasticity over time and then becomes brittle. Most speakers are made from a composite material that contains paper mixed with rubber compounds. Once a hole begins, time may be of an essence before the hole gets larger. You can repair the speaker without removing it from the large housing.

Things You'll Need

  • Screwdriver Damp cloth Medical roll bandage tape Scissors 100% silicone caulk
  • Remove the exterior grill of the speaker with the screwdriver. You must gain access to the paper cone that is damaged.

  • Use the damp cloth and remove any dust or debris from the speaker cone surface. Be careful not to make the hole any larger.

  • Use the scissors and cut a length of the medical bandage tape from the roll. You will want the length and width of the tape to extend at least 1 ½ inches past the hole in all directions. You can overlap the surface of the tapes edge by a ¼ to ½ inch. Be sure the tape lays perfectly flat against the surface of the paper cone.

  • Cover the surface of the medical tape in a 1/8-inch thick layer of the 100% silicone caulk. Use your finger to evenly spread the caulk over the surface of the tape and feather the silicone onto the paper cone. Make this surface as smooth as possible.

  • Allow the caulk to cure for 24 hours and then apply another thin layer of the silicone. Feather this layer a little past the first one onto the speaker cone. The layers of silicone will bond to the cone. The silicone will remain flexible for years if kept out of direct sunlight.

  • Allow the second layer of caulk to cure for another 24 hours before applying power to the speaker.

  • Reattach the grill and power up the stereo. The speaker will be good as new.

Tips & Warnings

  • If the speaker cone has become detached from the base around the circumference of the metal speaker frame, you can apply either ½-inch or ¾ inch-thick door foam seal. Attach the seal with the sticky back tape adhesive and apply silicone around both contact edges of the foam.

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