AudioFan Posted November 23, 2009 Share Posted November 23, 2009 I just purchased a new set of speakers. After connecting them to my system I noticed a high pitched tone or signal coming from the tweeters. If I unplug the USB cable from my laptop that connects it to my preamp/processor the signal goes away. If I leave the USB connected to the laptop but disconnect the power cord and leave the laptop running on battery the signal also goes away. The high pitched tone or signal sounds like morse code being transmitted from the tweeter. I was able to borrow a Chord 'Chordette Gem' DAC to see if it would have any effect or remove the high pitched sound. It actually made it worse. I could hear the signal across the room. And it added a single "thump" sound when the music started. I stopped the music and another "thump" occured about 30 seconds after the music had stopped. I immediately removed the Chordette from the system. The laptop is a Dell Inspiron 1525 running Vista. I've tried plugging the laptop into a couple of different surge protectors (Brickwall and Monster) and directly into the wall outlet. No change. Any ideas as to what's causing this and how I might remedy the situation would be much appreciated. Audiofan Link to comment
The Computer Audiophile Posted November 24, 2009 Share Posted November 24, 2009 Hi Audiofan - Welcome to Computer Audiophile. Try floating the ground. In other words plug your laptop's three prong power cable into a three-to-two prong converter to only two of the prongs go into the wall outlet. This should identify if it's a ground issue, which I believe it is. Founder of Audiophile Style | My Audio Systems Link to comment
AudioFan Posted November 24, 2009 Author Share Posted November 24, 2009 I found a converter and plugged into the wall outlet, and grrrrr it didn't seem to work. But then I plugged the converter into the brickwall surge protector and it worked!!!!!! Genius. Thanks!!!!!! Link to comment
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