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Forum: Old versions

Topic: digital noise

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This is my strange problem. Running virtual dj on a 2.4 Ghz laptop AMD XP, MP3's on Maxtor 160gB connected to a ECLER MAC70 Mix table via external Maya 7.1 USB soundcard.Front system was a 15 kW Martin Audio system. Without any faders open (!) there was a terrrible noise, like a digital hiss the moment my external hard disk started. It was like a motorbike running from zero to 150 km/h. suspected groundloops, taped of the earthpin of the adapter. Was better but stil very annoying (digital)hiss.Just like a gsm close to a radio. Don't think it has anything to do with the program, but more the USB; connection anybody any idea or tip?
 
Posted Mon 21 Jul 03 @ 12:56 pm
Had the somehow similar problem. Wasn't the software. Winamp did the same. Then I disconnected the Laptop Power cable and it was gone. The cheapest Solution is to put some scotch tape on the ground of the Laptop power cable. Might be a little risky. Other solution is to use decouple adapters between the Maya 7.1 and the Mixer (or preamp if you don't have a mixer).
 
general rule for bigger soundsystem:

put your turntables, mixer, pc,... on 1 electrical circuit
your amplifiers on an other
light installation on an other

no more problems
 
For me the solution was a GROUND LOOP ISOLATOR from RadioShack.
 
Get a two prong plug for your power supply and your noise will be gone.The ground is the culprit just eleminate that and all will be well.
 


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