Monitor vs Power Interference

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Glennb
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2011/12/27 03:42:36 (permalink)

Monitor vs Power Interference

Ok, even though I have been noodling around a few  years, I am just really still a newb. Today I bought my first studio monitors, Yamaha HS 80M. Plugged them in and was greeted with a hideous hiss/buzz. Up until now I have "monitored" through headphones and occassionally a home stereo set up and I have never had a problem with noise.
 
I have worked out the source of the noise is interference from my laptop power supply. When I pull it out and operate the lappy on battery it is silent.
 
So....whats the trick? Buy a different power supply? One thing I thought about but I am ignorant about is "proper" speaker cables. At the moment I just have an instrument cable connecting to the speakers, could that be the source of the noise, if I use "balanced" cables, would that help?
 
Any help would be appreciated.
 
BTW, I am really happy with these monitors, it obviously makes a huge difference.
 
 

Glenn in Aus
SHSXL6 on laptop with Intel i5 CPU M480 @ 2.67 GHZ 2.67GHz 4G RAM (2.86 usable?) 32Bit operating system on Windows 7 -> Presonus USB Audiobox.
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    fireberd
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    Re:Monitor vs Power Interference 2011/12/27 08:19:25 (permalink)
    Switching power supplies (what PC power supplies are) can generate RFI "hash" but generally recent power supplies are relatively problem free.

    I assume you have them plugged into the Presonus Audiobox's "Line out".  If you are plugged into the headphone out, change to the Line Out's.  I had a noise problem in my Samson studio monitors and it turned out it was because I was connecting them to a headphone out on my Saffire Pro 40 rather than the "line out's".   You should also be using shielded audio cables. 

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