ceiling mount microphones

[Bob Olson]

If the space doesn't have too much ambient noise, they work well. We've
given up on them in our nodes in MCS since they have been picking up a LOT
of building noise (low rumble, hum, etc, that is very nondirectional).

The PZM-6D is the little stealth one, right? Those looked nice.

If you're ceiling mounting really beware ambient noise. One of the rules
for mic placement is that you want the people being miked to be some
factor closer than any ambient noise sources. If you've heard the node at
LBL (sorry for picking on you Nancy :-) you will hear what happens if that
is not the case. Turning up the gain enough to hear the speakers results
in the noise being amplified to a similar level.

Hm, see also 

	http://www.shure.com/support/technotes/app-ceiling.html
	
	http://www.shure.com/support/technotes/app-critical.html
	http://www.shure.com/support/technotes/app-snratio.html

interesting measurements to do on some of our spaces. Also lots of other
interesting acoustic stuff.

--bob

On Fri, 28 Jul 2000, Jeff Ramacher wrote:

> Any suggestions for ceiling mount (ambient) microphones?  I have heard
> that ANL has some mounted with plexiglass on the ceiling - how well does
> it work for picking up conversation?
> 
> What should I allow for spacing between ceiling mount mics?
> I'm looking at the Crown PZM-6D.  Any other suggestions would be
> appreciated.
> 
> Thanks in advance.
> --
> Jeff Ramacher (jeffr at mhpcc.edu)                | (808) 879-5077, x264
> Maui High Performance Computing Center (MHPCC) | fax (808) 879-5018
>                                                | http://www.mhpcc.edu
> 
>