Having problems with your Harman Kardon SoundSticks II Computer Speakers ?

Am getting electrical feedback (droning sound) when I plug in my 2 year old soundsticks. Got any hints?

Answers :

Check the grounding on the power supply. That eliminates almost all "droning" and "buzzing" feebacks. Try detaching all externally powered accessories to see whether one might be responsible (external hard drives are traditionally the worst, but I got a USB hub once which had a faulty wiring - the droning was the first warning of impending doom).

If this does not work, you can sometimes get rid of some interferences (but usually at higher frequencies than dronings - anyway, it's worth a try) by clamping a ferrite load around the mains wire and/or the DC output wire. Many USB and audio cables will have clip-on ferrite loads which you can unlatch using a thumbnail or a pencil knife, and reuse for your own.

If it's the AC adapter, you might be able to secure a compatible AC adapter that will buzz less. I've found some recovered printer AC supplies from Hewlett Packard to be quite silent electrically (check voltage, wattage and polarity carefully though).
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