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Learning how to repair blown subwoofers is important to ensure audio quality over time, especially if you have top-tier speakers. Exceeding the recommended bass levels on your system can cause internal damage, even on premium subwoofers. So, if you hear that terrible scratching sound from your faulty subwoofer, you can fix it at home. While repairing a damaged speaker cone sounds complicated, it is simple with this step-by-step guide. Stick around to learn how to fix blown subwoofers and restore your quality sound.
Your subwoofer can take damage from situations like amplifier clipping, excessive sound, or power signals. So, if you’ve learned how to get deep bass from a subwoofer, do not overwhelm it with too much power.
After deconstructing your defective subwoofer, use tape to remove dust particles from the voice coil gap.
Also, if you hear a distorted sound or have no audio signal at all, you should learn how to fix a subwoofer with no sound. Unseen damage usually indicates a bad voice coil, but torn subwoofer cones are easily detectable.
Once you’ve completed the restoration process on your broken subwoofer, consider learning how to hide a subwoofer. Humans cannot easily detect the source of low-frequency sounds, so your subwoofer placement isn’t a massive variable for sound quality.
With a screwdriver, remove the screws holding the subwoofer in the enclosure and pull it out.
Connect a multimeter to your speaker terminal wires and check for electrical resistance. If you see resistance, your voice coil is fine, and you can simply perform a cone replacement. That said, you may want to replace the voice coil anyway, especially if you’re working with older subwoofers.
Use a heat gun for a few minutes to loosen the glue on the top plate and outside edge. Then, use a sharp blade or flathead screwdriver to pry the top plate and foam surround away. Do not damage this plate, and clean the old glue from the center and edge.
Use a screwdriver and sharp blade to remove the speaker cone, voice coil, and spider. Disconnect the voice coil wires if you haven’t already.
Ensure your hardware is clean before reassembling the speaker unit. You can use an air compressor or microfiber cloth to remove dust or debris from the subwoofer.
Slide your voice coil into the voice coil gap in the spider, and glue the cone plate on the center and sides of the frame. Ensure the cone and voice coil are centered in the spider and allow the glue to dry for at least 24 hours.
Reconnect the speaker wiring and reinstall the subwoofer into the speaker frame. Test your work.
Never run your car audio system at full volume on a cold morning because a frozen subwoofer needs to warm up to avoid speaker cone tears.
STAT: A 2019 Noise Health survey found that women preferred an average 71-decibel listening volume regardless of their headphone type. (source)