In the words of Gary Guinn (AKG Acoustics), “The past two years have brought a whirlwind of engineering nightmares with Blackberry and other wireless units creating problems in wired and wireless microphones.” http://www.crownaudio.com/kb/entry/163/
Indeed, combining shielded and unshielded wires with wireless phones and other wireless devices can lead to interference and buzz (you can hear samples of the issue http://www.youtube.com/watch?v=sZEMoH2xRfM&t=0m13s, http://www.youtube.com/watch?v=emxPVUM3y54 and http://www.youtube.com/watch?v=HzufTbKiJzw
Solutions have been presented but none are ideal:
- http://www.crownaudio.com/kb/entry/163/
- http://www.youtube.com/watch?v=TzCZQOsdROc
- http://www.metacafe.com/watch/1132063/stop_that_buzzing_from_speakers_because_of_your_cell_phone/
- http://www.maclife.com/article/iphone_buzz_kill
- http://www.youtube.com/watch?v=kArzbztP7i0
Another interesting solution (suggested here):
http://www.neutrik.com/content/products/level03.aspx?id=204_1603252336&catId=CatMSDE_audio
IEEE suggestion (add ferrite cores):
http://www.hottconsultants.com/pdf_files/aes-2007.pdf