Symptoms
- Constant low hum even with no audio playing
- Buzzing that gets louder with volume
- Noise changes when other devices are plugged in nearby
- Rattling or buzzing only at certain frequencies
Likely causes
- CommonGround loop between speaker and other connected devicesDevices plugged into different outlets can create a small voltage difference that causes a hum.
- CommonLoose speaker wire connection or damaged cableA partially disconnected wire can create crackling or buzzing noise.
- PossibleInterference from a nearby phone, router, or dimmer switchElectronic devices can induce electrical noise into audio cables.
- PossibleSpeaker cone rattling against something loose (grille, cabinet, object nearby)Vibration from bass can cause nearby loose items or a damaged cone surround to buzz.
- Less commonDamaged speaker driver or blown voice coilA torn cone or damaged coil produces distorted buzzing especially at higher volumes.
What to do
- Turn the volume all the way down and see if the hum persists, which points to a power/ground issue rather than the audio source.
- Plug the speaker and connected source device into the same power outlet or power strip to eliminate ground loops.
- Check all speaker wire and cable connections for looseness and reseat them firmly.
- Move phones, routers, and other electronics away from speaker cables and the speakers themselves.
- Remove speaker grilles and check for loose screws, debris, or objects on top of or near the speaker that could vibrate.
- Play a bass-heavy track at moderate volume and listen closely to each speaker individually to isolate which one buzzes.
- If a specific speaker buzzes even when isolated from cables and placement, inspect the cone for visible tears or damage.
- Try a different audio cable or input source to rule out a cable-specific noise issue.
Tools and parts
- Flashlight
Speaker wireSearch: “speaker wire replacement”
When to call a pro
If buzzing traces to a torn speaker cone or damaged driver, a professional can recone or replace the driver, or you may need a replacement speaker.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.