Audiophiles: Noisy USB Connections between Mac Intel and DJ Mixer

Seeking experience/ help/ advice from DJs or audiophiles:
I'm having trouble with noise in an audio system after connecting a Numark USB DJ mixer to my new iMac via USB.
The noise is a steady, high-pitched tone with low amplitude that does not increase or decrease when the gain on the mixer is adjusted. In fact, the noise persists when all levels (channel and master) are turned all the way down. The noise only appears after making the USB connection and selecting the USB audio driver in the Sound panel in System Prefs. The sound does not persist if the cable is connected but some other device (eg Built-in audio out) is selected in the Sound panel.
However, oddly, when I made a connection using a 1/4 to RCA cable from the audio out on the iMac to an available channel on the mixer, the noise was reduced (but not eliminated)when I selected the USB driver in the Sound panel.
When I record the incoming USB audio signal using Peak 4.14, the noise is not captured by the software. It appears to be present only in the external stream/ speakers. The speakers are Samson 65a active studio monitors positioned more than 5 feet from the computer and audio system. None of the audio cables are touching any of the power cables in the setup.
The only possible explanation I can think of is that the electrical outlet in my home is not grounded properly. But the audio system sounds fine on its own - no noise. If there were a grounding problem wouldn't noise exist regardless of whether or not a USB audio channel were open and active within the system?
Has anybody experienced problems with USB-related noise in an audio system?
The purist in me is going nuts!
Thanks in advance for any help!
iMac Intel Duo 20"   Mac OS X (10.4.4)  
iMac Intel Duo 20"   Mac OS X (10.4.4)  

I had the same problem and came here by searching.
Per Rosengren's method solved the problem, but he didn't say how to do it, so I'll try to explain step-by-step for anyone that may venture here.
Open Device Manager (right click on Computer > Manage > on the left side, under System Tools choose Device Manager)
Choose the problematic device in Network Adapters (for me it's called HTC Remote NDIS based device)
Right click on it and choose Update Driver Software...
Click Browse my computer for driver software
Click Let me pick from a list of device drivers
Uncheck the box Show compatible hardware
For the manufacturer, choose Microsoft Corporation
Now you will have two options:
- Remote NDIS based Internet Sharing Device
- Remote NDIS Compatible Device
I chose the second one and it solved the problem, but if it doesn't work you could try the other one. In my case, the driver that was being used was neither of these, but a special driver from Android SDK ADT bundle.
Pick one and click Next. If a dialog comes up, confirm by clicking Yes.
Wait a few seconds for the connection to restart. If it doesn't work, try disabling and reenabling USB tethering on the phone, or reconnect the USB cable.
I should also note that I'm using a custom Android ROM on HTC Wildfire S (unofficial Cyanogenmod). If you have a stock ROM with HTC Sense, maybe this method may not work and you'll need a proprietary HTC driver.

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    Edited by: skyrma on Feb 24, 2012 2:47 PM
    Edited by: skyrma on Feb 24, 2012 2:47 PM

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