Static electricity in unit and/or wiring. .
Hi!
(again) please ask an accurate question... did you record the crackling? This doc http://www.mackie.com/products/srm450/ shows it's a daring design. The weakness is that the servo system is more prone to (unusual) problems than a ordinary passive system, amp to speakers. some loose fixings could be the problem, some old psu capacitors, the servo sensor, the mechanical base of the speaker, bad grounding, ground loop... many possibilities. Ask a technician and good luck.
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