Mac Mini Apogee Duet A/V ampli: usb noise

Hello,
I have a problem using the mac mini with apogee duet to listen music through my AV ampli.
The problem is a disturbing noise. I think it is an interferrence coming from the duet card. This sound is very similar to the sound of a fax and it modulates together with the change of duet operations.
In order to stop this hum from the ampli I can only take off the firewire cable (but I have no sound of course) or I have to take off the adaptor minidisplay- vga that goes to the lcd.
The strange thing is that I also have a second monitor connected to the mac minii and it is also producing a noise (different though). In this case the noise seems more related to a ground loop.
Indeed, the monitor electrical plug has a ground. The LCD one has no ground.
So, if i unplug the monitor the hum stops. If I unplug the LCD, of course no change.
Can somebody help me on this? I contacted Apogee and they suggested me to lft the ground to the mac mini power plug. I was a little bit surprised abut this.
Anyway, I tried to have all plugs near in the same outlet.
Thanks for your help.

Hi,
Sorry I don't have an answer to your question but I have a question for you on a related topic. I notice you have a Mac Mini. The Apogee Duet requirement is for a Mac G4 or G5 with 1 GHz processor speed and 2 GB of RAM. I meet those requierments except that I have a Mac Mini (same as you). Other than the ground loop, have you had any problems running the Duet with a Mac Mini?
Thanks,
Jeff

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Message was edited by: blick
Message was edited by: blick
Message was edited by: blick

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I'm posting this from my windows laptop, if theres any workaround to this problem using windows, that would be great

I am on my way to a possible cure. I located in the attic the original (still in their sealed box) Official Mac Mini Install Disks after calling Apple SuUpport. (I had been trying to resurrect using an OSX Tiger Black box install dvd set). The machine just would not boot from that black Tiger OSX DVD...However:
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For others: Dan said that the install must have encountered a glitch and was left in an incomplete state with some critical bit of software malformed. He could not explain that it would not boot to open firmware, or what the glitch might have been.
I will post again once i have a working system and once again attempt to get current in version and security updates...after a complete backup to a nice new external drive
Oh well, live and learn.

Mac Mini Apogee Duet A/V ampli: usb noise

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