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Old 03-08-2010, 07:20 PM
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WalkGood WalkGood is offline
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Join Date: Aug 2006
Location: FL
Posts: 12,577

I do not know about the fiio specifically, but I have read that many of the lower cost portable amps do pick up unwanted electromagnetic interference when your cell phone rings which can produce an annoying audible buzz. The more expensive amps either have an on-board EMI filter or special layout design which helps in bypassing EMI or improving RF immunity. Fortunately the one I have can sit next to or on top of a cell phone and it doesn't pick up anything at all, but then again I can't hear the phone ring

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