I’ve always wondered about this …

Why Your BlackBerry Causes Speakers to Buzz | Advice and Opinion

To get to the root of the issue, I spoke with Duncan Bradley, Research In Motions RIM director of global market intelligence. RIM is the BlackBerry manufacturer. Bradley explained to me that cell phones cause this buzzing interference when near some speakers or other devices that can resonate radio frequencies RF because such devices often feature poor quality shielding mechanisms to block radio waves from being received. The devices act as passive antennas, picking up cell phone radio signals, but they dont have any way to modulate or translate them into anything intelligible, according to Bradley. Speakers or other electronics with higher quality shielding mechanisms yield less buzzing when near phones, he said.

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