Harman-kardon speakers and various loud noises( mac mini)

My Harman-Kardon ball speakers, which have served me well from my old Cube days, are going loopy.
They have been happily USB connected to my 17" studio display (and powered from it) Recently, I've been hearing clicking noises, which can turn to a very loud 'rushing' sound if the computer has been active for more than an hour. I know some have had software issues with their sound systems due to 10.4 updates, but none reported very loud sounds. I came home yesterday to what sounded like an apartment fire alarm, it was that loud, but it was only my 'sleeping' computer. The noise ended when I pulled out the USB.
Could it be software? I don't want to buy new speakers if it might be. Or, time for knew speakers?-- if so, any advice? Happy New Year. Kevin

While it may not be all that helpful, I had some issues with an Altec lansing speaker set on my G5, where background noise was abnormally high almost all the time, and from time to time there would be rushing noises which grew very loud. It turned out to be a faulty USB hub, even though the speakers were not USB connected.
To troubleshoot your system, I would disconnect everything external bar the basic essentials, including any hubs or other devices, even the keyboard and mouse, and test the system that way. It would not be expected for software or MacOS itself to cause the sort of effects you describe.

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