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USB sends electric shock to sound card and speakers. "Boom" anytime it starts/stops/reboot

Since I installed Mountain Lion (july 2012) on my 2009 iMac, my usb ports send an electric shock to my external sound card anytime it starts/stops/reboot.

So my speakers make a sound like "boom" and I'm afraid they will be ruined..how do I control this shocks?

It NEVER happend with Snow Leopard and Lion. iOS always purchased on Mac App Store.

iMac (21.5-inch Late 2009), iOS 6.0.2

Posted on Jan 23, 2013 5:10 AM

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4 replies

Jan 27, 2013 1:55 PM in response to BDAqua

Thank you for the quick reply. Sadly it did not work 😟. I can only choose between 44100 and 48000 hz but with both situations, the problem is still there.


It's most like an USB problem I think, it happens wherever I connect the cable (in any of the 4 ports). I think the Mac sends an electric signal (you can listen the speakers or see the leds in the sound card) to all ports while stopping/starting/waking/rebooting. Actually while starting it happens more than one time.


I would send a video, but I don't know why but my "Insert Video" button is unactive..😕

Jan 27, 2013 2:32 PM in response to lucafromverona

The problem you describe could happen if the electric outlets are not correctly grounded.


For power, your speakers are plugged into an outlet, right?


Is your Macbook power adapter plugged in to the same oulet? If not, and if it is possible with the power cords you have, try plugging both - the speakers and the macbook power adapter - into the same duplex outlet.

USB sends electric shock to sound card and speakers. "Boom" anytime it starts/stops/reboot

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