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Message from jsavage@yorku.ca

Hi,
    We're about to install wireless APs in a new lecture hall and I've just found out that our desired AP locations will be in close proximity to the lecture hall speaker cabinets.  I've heard that there can be some interference between WiFi and speakers.   Has anyone run into this?

........thanks...................Jamie
 
Jamie Savage  |  Senior Communications Technician  |  University Information Technology

010 Steacie Science Building  |  York University  |  4700 Keele St. ,  Toronto ON  M3J 1P3 Canada

T: 416.736.2100 x22605  |  F: 416.736.5830  |  jsavage@yorku.ca  |  www.yorku.ca

York UIT will NEVER send unsolicited requests for passwords or other personal information via email.  Messages requesting such information are fraudulent and should be deleted. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

Message from iam@st-andrews.ac.uk

It might be possible at the input side, but I doubt very much at the speaker end (unless they’re powered speakers that are fed at line-level).

--

ian

 

 

I can’t say definitively that they won’t interfere, but I can say I set up a temporary wlan in a large lecture hall where the only place I could put APs was right next to the main speakers.  There was no issue.

 

FWIW, I can’t think of any way that the radio signals from an AP would couple into a conventional speaker. The frequencies are just too high.  In my experience, the interference from things like cell phones is always involves a low-end amplifier near the phone.  Low end in this case implies non-linear and poorly shielded.  I’d be very surprised if you had any problem with the high-end speakers and amps you would find in a large auditorium set-up by a professional AV staff.

 

Chuck Enfield

Sr. Communications Engineer

Telecommunications & Networking Services

The Pennsylvania State University

110H, USB2, UP, PA 16802

ph: 814.863.8715

fx: 814.865-3988

 

Chuck and Ian make excellent points. I've never had the dreaded "click click click BUZZZZZZZ" of cell phones from a WiFi only device or AP. Any chance you can get access to the same or similar setup for a quick test? Put an AP of the same or similar model of what you want to install next to different parts of the system (input, amp, speakers) and turn the power level of the AP up to max and associate a few clients. -Luke =-=-=-=-=-=-=-=-=-=-=-= Luke Jenkins Network Engineer Weber State University
Message from sarrington@baylorschool.org

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I am currently out of the office.  I will return on March 26, 2012.  If this is an emergency please contact tech support.

********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Among the most notorious culprits for electric noise in general is the dreaded cheap power supply. If APs are being powered with PoE, this is no issue. But if you are locally powering an AP with a "wall wart" that does invite the sort of noise being discussed here . For that matter, any "wall wart" power supply (not just for APs).in the environment should be viewed as a suspect when there is noise about over speakers. -Lee Badman _______________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Luke Jenkins [ljenkins@WEBER.EDU] Sent: Friday, March 16, 2012 8:57 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Wifi interference with lecture hall speakers Chuck and Ian make excellent points. I've never had the dreaded "click click click BUZZZZZZZ" of cell phones from a WiFi only device or AP. Any chance you can get access to the same or similar setup for a quick test? Put an AP of the same or similar model of what you want to install next to different parts of the system (input, amp, speakers) and turn the power level of the AP up to max and associate a few clients. -Luke =-=-=-=-=-=-=-=-=-=-=-= Luke Jenkins Network Engineer Weber State University
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