Why Is My Subwoofer Making A Humming Or Buzzing Noise

If your subwoofer is making a humming or buzzing noise, there could be several potential causes. Here’s a detailed checklist to help you diagnose and fix the problem:

Common Causes and Solutions for Subwoofer Humming or Buzzing Noise

Ground Loop Issues:

Cause: Ground loops occur when there are multiple paths to ground, creating a loop that can pick up interference and cause humming.


  • Use a ground loop isolator. These devices can break the ground loop and eliminate the hum.
  • Ensure all your AV equipment is plugged into the same power outlet to maintain a common ground.
  • Use a power conditioner to help manage power quality issues.

Cables and Connections:

  • Cause: Damaged or poorly connected cables can pick up interference and create noise.
  • Solution:
    • Inspect all cables for damage, such as cuts or frays. Replace any damaged cables.
    • Ensure all connections are secure and properly seated. Loose connections can cause noise.
    • Use high-quality, shielded cables to reduce the chance of interference.

Interference from Other Electronic Devices:

  • Cause: Other electronic devices can emit electromagnetic interference (EMI) that affects the subwoofer.
  • Solution:
    • Keep the subwoofer away from other electronic devices, especially those with high power usage like computers, routers, and microwaves.
    • If possible, reposition the subwoofer to see if the noise decreases when moved to a different location.

Electrical Interference:

  • Cause: Nearby electrical devices or wiring can introduce noise into the subwoofer.
  • Solution:
    • Use ferrite cores on your cables to reduce electrical interference.
    • Ensure your subwoofer’s power cord is not running parallel and close to other power cords or electronic devices.

Power Supply Issues:

  • Cause: The power supply to your subwoofer may be unstable or contaminated with noise.
  • Solution:
    • Use a dedicated power outlet for your subwoofer, separate from other high-power devices.
    • Try using a power strip with noise filtering capabilities.

Faulty Subwoofer:

  • Cause: The subwoofer itself might have an internal fault or defect.
  • Solution:
    • If none of the above solutions work, test the subwoofer with another audio system to see if the problem persists.
    • Consult the manufacturer’s support or consider professional repair if the subwoofer is under warranty.

    Steps to Diagnose and Fix the Humming or Buzzing Noise

    1. Identify the Source of the Hum:
      • Disconnect the subwoofer from the receiver and see if the hum persists. If it does, the issue is with the subwoofer or its power source.
      • If the hum stops, reconnect the subwoofer and then disconnect other components (one at a time) from the receiver to identify the source.
    2. Check Ground Loop Isolators:
      • If you suspect a ground loop, use a ground loop isolator on the subwoofer’s audio cable.
    3. Inspect and Replace Cables:
      • Check all cables and replace any that are damaged or of poor quality.
    4. Reposition and Isolate Equipment:
      • Move the subwoofer away from other electronic devices and see if the noise reduces.
      • Keep audio and power cables separated to avoid interference.
    5. Use Power Conditioners:
      • If power supply quality is a concern, use a power conditioner to ensure stable and clean power to the subwoofer.

    By systematically checking these potential causes and applying the appropriate solutions, you should be able to identify and eliminate the humming or buzzing noise from your subwoofer.

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