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Author Topic: Formula for hanging Choir Mic's  (Read 924 times)

Brenton Shaffer

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Formula for hanging Choir Mic's
« on: April 07, 2006, 10:17:00 pm »

We are knocking down a wall in our sanctuary to add more space.
We are using this opportunity to redo our entire sound system.
Currently have two Audio-Technica hanging condenser choir mics.
Wanting to know if anyone has any tips for hanging these?  I know the formula, but cant seem to get this quite right.  Any help would be appreciated.
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Ivan Beaver

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Re: Formula for hanging Choir Mic's
« Reply #1 on: April 08, 2006, 12:51:19 pm »

Placing choir mics can sometimes be a chore.  The most basic rule to follow is the 3/1 rule.  Basically that means that you take the distance from a mic to nearest singer and the next microphone has to be at least 3 times that distance away form the same singer.  This helps keep the combfiltering/interference down.

Here are some of the issues involved.  If you want more gain before feedback, then you put the mics closer to the performer-basic PAG-NAG formula.  This will however reduce the total amount of gain you can get out of them, because of the  of increased number of open mics.  This requires that more mics be used.  You will also pickup more individual singers, rather than ensambles of singers.  If you move the mics futher away from the singers, you get a much better blending of voices, but have less gain before feedback and you pickup more sound from the room.  Basic S/N issue.  The singers are the signal and the sound from the room (including organ/monitors/orchestra/PA system/reverberation etc) is the noise.  In order to properly amplify the choir you have to have a high ratio of S/N, or else you just get mush out of them.

You also have to take into account the directivity of the main loudspeaker system, acoustic properties of the room, costs and more when choosing the number of mics and types.

Now this also assumes that when you are looking at the plan for a particular choir loft and the seating in it and you have the boxes in the ceiling placed for proper pacement.  Then after you hang the mics, you find out that the seating layout has been changed and half your mics are now in aisles and you no longer have decent coverage.  Been there done that-a couple of times.  Now who has to pay to have the mics moved? and what does it look like after you staple them to the ceiling?  You (as the contractor) look bad because you didn't know where to plce the mics-nevermind the fact that the locations were determined months ago when the electrician ran the conduit for the boxes, and then they changed the choir loft layout-without telling you.

Sorry for the rant.
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Can I have some more talent in the monitors--PLEASE?

Ivan Beaver
dB Audio & Video Inc.

ProSoundWeb Community

Re: Formula for hanging Choir Mic's
« Reply #1 on: April 08, 2006, 12:51:19 pm »


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