Iphones and normal landlines cordless phones make the buzzing noise in speakers. I have tried the Ferrite beads near the speaker, no luck, near the pc end, no luck, nothing works! Help!!
Shift the cordless phone and it is one less to worry about.
Going back a few years low batteries on cordless phones used to cause the odd problems.
Try a new lead from the computer to the input to the speaker amplifier. Buzzing and other noises are being picked up by the input lead which needs to be screened and preferably earthed.
You need the ferrite rings at the computer/amplifier end not the speaker end, it is RF getting into the computer that is causing the trouble and it could get in via any lead but speaker leads are the most likely culprits.
I tried ferrite rings on both ends, no difference.
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