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Pulsing whoosh noise from monitors
For current or would-be users of Apple Mac computers, with answers to many FAQs.
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If you haven't already, separate your audio level wiring from the power cords. Then plug all the power cords into the same wall outlet with a power strip as needed (star connection). This will reduce/eliminate ground loops, EMI and RFI issues, and may completely resolve your noise problem. I have used this simple tip for over 20 years in multiple home studio installations near a major interference laden city and it has always resolved and prevented noise issues. In any event this star connection for your power is best practice in a usual home studio (that isn't built within a Faraday cage) and can at least rule out external interference and help you focus on equipment malfunction if it doesn't resolve your noise issue.
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Most likely to be a grounding issue - either a ground loop or a lack of a good ground in the system. If this has only just started then check that all your cables are properly connected.
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