Powered speaker works fine with clean audio feed but get it connected to the audio out of the owner's laptop and it drops into some undefined error mode killing the speaker output and display/,switch off, restart and repeats. The powered speaker has an unused MP3 connection and tuner and laptop has wifi etc, unused for audio feed. I suspect some sort of RF is being conducted down the audio leads. Other than passing 2 or 3 turns through a ferrite ring - any ideas?
Laptop to powered speaker problem
Aug 01, 2011
2 Replies
Does it do same when laptop working from battery? What about just with the common connected? Make up extension lead with rf filter to determine if anything conducted.
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Battery use is an interesting ellimination test. I've not seen the laptop , so don't know if wifi/bluetooth or whatever can be switched off.
Its a bouncing "repair". Just needed the mains cable replacing but as it is transported in a box , cable frayed at fixed cable entry. Replaced with an IEC socket which of course required the metal panel on the rear to be bonded to ground. Since then this problem, no problem before. The earthed metal plate is now acting as an RF collector/ reflector or something. I'll have to also find out if he uses a long extension power lead to this , used in a hall.
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