Speakers are one of the most important components in a Hi-Fi or home theatre system. They are often expensive, so it is worth repairing damaged speakers rather than buying new ones. Cracked foam surrounds caused by dry rot, dented dust caps, or holes in the cone can result in a blown speaker. Users can salvage a blown speaker by using a speaker repair kit and replacement parts found in Hi-Fi and home theatre stores, and online on eBay. With the right supplies and a few simple techniques, users can repair a damaged speaker quickly.
Cracked foam surrounds are the most common issue seen in blown speakers. When the foam surrounding the outer edge of the cone deteriorates, the speaker produces a buzzing noise, especially with bass sounds. Replacing a foam surround is easy.
Using a screwdriver, remove the speaker from the cabinet or casing. Detach the speaker wires connecting it to the amplifier. Mark the wires and connectors so that the polarity is clear when reconnecting the speaker.
Prise away the plastic or cardboard ring surrounding the foam, being carefully not to damage it. Use a utility knife to scrape away the old foam and adhesive from the outer edge of the speaker and the ring. If any foam is on the speaker cone, remove it by gently rubbing it with a finger.
Apply a thin bead of adhesive to the outer edge of the speaker cone. Press the inner edge of the new foam surround into place and wait for two hours for the glue to dry. Then apply a bead of glue to the metal of edge of the speaker, press the outer edge of the new foam surround into place, and wait for two hours. Apply a third bead of glue on the outer edge of the speaker to reattach the cardboard or plastic ring. Turn the speaker upside down and let it dry for two hours.
Reconnect the wires to the correct terminals and put the speaker back in its cabinet or case. Finally test the sound quality.
A blown speaker may have a damaged dust cap, cone, or dome. There are simple methods available to remedy these issues.
One of the easiest ways to repair a pushed in dust cap is to use suction from a vacuum cleaner. Turn on the vacuum cleaner and place the end of the hose attachment over the dent. In most cases, it pops out. If that is unsuccessful, use a bent sewing needle to pierce the centre of the dent and use it like a hook to pull up the dent. Alternatively, trim the end of a cotton bud with a pair of scissors to create a flat surface. Apply a few drops of superglue and press it into the centre of the dent. Let it set for up to 10 minutes and gently tug until the dent pops out. To remove the cotton bud, twist gently and then pull.
Repair a tear in a speaker cone or dome with tissue paper and polyvinyl acetate glue. Cut a piece of paper slightly larger than the hole. Thin the glue using water and brush it over the paper and cone to patch the hole. Apply a second layer of paper, if necessary. Turn the speaker over and apply another patch to the back of the hole.
If the blown speaker is showing signs of smoke damage to the assembly, owners should replace the whole moving assembly, along with the voice coil, spider, surround, and cone. This is a fairly easy on some tweeters and compression drivers, but it is best left to a professional when it comes to woofers.
eBay makes it easy to shop for products to repair blown speakers. Simply enter keywords into the search bar found on every page, for example, " speaker repair kit". Browse the results or narrow down the listings by using the category filters, such as price range. Read the item description carefully and check the seller's feedback before making a purchase. There are several problems that cause a blown speaker, including cracked foam surrounds, dented dust caps, and holes in the cone. If the blown speaker is beyond repair, check the offers on the eBay Deals page to find the perfect replacement.