Hissing Sound with Extra Display

Hello
I'm hearing a hiss through my speakers (connected through a firewire Apogee Duet) when I connect an extra display to the DVI port. This goes away when I turn off Airport.
I'm currently using a Mac Cinema Display 24" with a Gefen adaptor mini display port to DVI.
However, I had this same problem with a Samsung display.
Thanks for your help!
Grabbin'

this is the one I have at home
http://www.monstercable.com/productdisplay.asp?pin=592
but it can be any other piece of hardware that has noise filter . the idea is this since sound is built of waves the initial wave that we start off with being the sine wave of the AC plays a great role on the clarity of our final sound . And with normal speakers this is not really audible but with high end equipment the interference from other stuff around such as light dimmers and electrical appliances can very well be heard . that's where the noise filter comes in ..
hope this helps

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