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Whenever I do these types of recordings I always work off the placement of my main pair. I try and get the best stereo image & balance between direct & reverberant sound possible. I then will use a pair of mics as outriggers to add width to the recording and then a pair of room mics to add depth.
ORTF or NOS are my fav's stereo mic tech's for my main pair. ORTF's ill use when the performers are positioned alot closer and NOS when they are spread out more. 3M is a good starting point and then just listen to how it sounds, take the opportunity to move your main pair closer and further back to give you an idea of how it sounds. You will be amazed how different just 30cm will make. I own a pair of AT4050's and they are great mics.
Once you are happy then bring in your outrigger mics. I would find 1M way to close to use as you will pick up too much direct sound of individual voices. Id be looking at 3 - 4M back. Then just listen to them on their own and with the main pair. Move them around until you find that spot where they bring out the width of the stereo image.
Finally the room mics 10M back is a nice starting point you might find that the combination of your main pair and outriggers will give you all the reverb you need of the hall but the rooms may be just that nice icing on the cake. Good luck with the recording!
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