How to fix a blown speaker voice coil

How to fix a blown speaker voice coil

Speakers are the artists that bring music and sound to life, but even the most resilient performers can face challenges. One common setback is a blown speaker voice coil, which can result in distorted, muffled, or nonexistent sound. However, before you consider replacing your speaker, know that you can often repair a blown voice coil and bring your beloved audio equipment back to its former glory. In this article, we’ll guide you through the process of fixing a blown speaker voice coil, from diagnosis to repair techniques, so you can once again enjoy the harmonious melodies you love.

Understanding the Voice Coil

The voice coil is a vital component of a speaker, responsible for generating sound by interacting with the magnetic field of the speaker’s magnet. A blown voice coil occurs when excessive power, high temperatures, or manufacturing defects cause damage to the coil, affecting its ability to move properly within the speaker’s magnetic gap.

Diagnosing a Blown Voice Coil

Before diving into repairs, it’s essential to confirm that the voice coil is indeed the culprit behind your speaker’s issues. Common signs of a blown voice coil include distortion, muffled sound, rattling, or complete loss of sound.

Repairing a Blown Speaker Voice Coil

  1. Tools and Materials:
    • Replacement voice coil (if available)
    • Screwdriver
    • Soldering iron and solder
    • Heat-resistant adhesive
    • Multimeter (for testing)
  2. Disassembly:
    • Carefully remove the speaker from its housing or enclosure.
    • Gently detach the cone and surround from the speaker frame to access the voice coil.
  3. Inspect the Damage:
    • Examine the voice coil for visible signs of damage, such as burnt or melted portions.
    • Test the voice coil’s resistance using a multimeter. A significant deviation from the specified resistance indicates a problem.
  4. Replacement Coil (if available):
    • If you have a replacement voice coil of the same specifications, carefully remove the damaged coil and replace it with the new one.
    • Follow manufacturer guidelines for soldering and securing the new coil in place.
  5. Repairing the Coil:
    • If a replacement coil is not available or you prefer to repair the existing one, gently remove any burnt or damaged insulation from the wire.
    • Use heat-resistant adhesive to insulate and secure the repaired portion of the coil.
  6. Reassembly:
    • Reattach the cone and surround to the speaker frame, ensuring they are aligned properly.
    • Carefully put the speaker back into its housing or enclosure.
  7. Testing:
    • Reconnect the speaker to your audio system and play a test sound.
    • Listen for any signs of distortion or abnormal sounds.
    • Monitor the speaker’s performance over time to ensure that the repair holds up.

Caution: Repairing a voice coil requires technical skill and precision. If you’re not confident in your soldering abilities or the extent of the damage is severe, it’s advisable to consult a professional technician or consider speaker replacement.


Fixing a blown speaker voice coil requires a combination of technical know-how, patience, and the right tools. By diagnosing the issue accurately, acquiring replacement parts if needed, and following proper repair techniques, you can often revive a damaged speaker and restore its ability to produce clear and vibrant sound. Remember, if the damage is extensive or beyond your comfort level, seeking the assistance of a professional technician can ensure a successful repair and a second chance for your favorite speaker to resonate with beautiful music once again.

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