I have been involved with quite a few large organ recital recordings and what has worked out well for me is just using a ROYER SF-12 stereo ribbon microphone placed on a 16-foot high mic-stand, along with two Audio-Technica cardioid condenser mics placed about 10-feet away on either side from the main pipes, but facing towards them. The SF-12's and the Audio-Technica's were all recorded onto their own tracks of a 24-track recorder.
If there were any choirs, other instruments and/or vocalists, then of course, they were also recorded onto each of their own tracks as well.
During the mixdown of these sessions, the ROYER SF-12 was "front and center" of the mix and the sound and then I would bring up the Audio-Technica's just a smidgen in order to add some solid low-end and a bit of "closeness" to the overall sound. Within some churches, the room ambiance and reverberation while sounding really "cool", could also somewhat overwhelm the listening sound.....so, mixing in the "closeness" sound of the Audio-Technica's just a bit gave the mix some added "body" to it. Sounds great on headphones!!!
I never had any problems with "phase" issues. My main problem with these organ recital recordings was keeping the audience members from knocking over my 16-foot high mic-stand with a $2,500.00 mic sitting on top of it!!! I ended up having to tape large signs onto the stand to tell people to > STAY AWAY < while also glopping a bunch of Duct-tape to the legs to try and secure the stand to the floor!!! It all worked well enough!!!
>> HAPPY ORGAN RECITAL RECORDING!!! <<
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