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John T

 
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Member Since: Nov 06, 2010
Location: UK
Posts: 59
John T will become famous soon enough
Mac Specs: 21.5in iMac

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Your problem sounds like an obvious earthing problem. The problem is most likely in the earthing of your speakers. Using a mains filter will have no effect on mains hum. The reason why you are not getting any hum when the speakers are connected to your laptop is because it is battery powered (and therefore isolated from the mains) and your iMac is obviously connected to the mains. Connecting your speakers to the iMac is obviously creating an earth loop.
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