"From the photos I saw of the Los Angeles concert at another thread here at the Gustav Mahler Board, it looked like the speakers for the organ were placed too close to the front. Maybe they should have been placed on either side of the chorus as opposed to the mid-point sides of the orchestra to balance things out, or even simply, to turn the speaker amplifier down. Maybe the sound balance people out in the audience during rehearsals found the organ to be loud, maybe some too soft. The hall itself was known to have acoustical problems."
Wade
My impression was that this was a very old theater organ. To me, it appeared that it had the usual larger speakers (or grids, whatever) on the sides of the stage, just as they usually are for most old theater organs. I didn't notice any speakers located in the middle. However, in addition to the grids for the organ, there were two very long Meyer Sound System speakers that mounted above the stage as well. They looked very similar to the ones that are mounted in Berkeley's Zellerbach Hall (I'm right across the street from there as I type this). There were four very narrow and discreet microphones hanging somewhere over the woowinds. To me, they looked very similar to the mikes that feed the Meyer system in Zellerbach. I really suspect that much of the problem was that the organ sound was getting sucked into the Meyer system, thus getting amplified a second time. Maybe I'm wrong about that.
I know that they had to be using the Meyer system because you could hear every single little bleep and bloop from the woodwinds without them being doubled at all. The horns - who were also not doubled - came through loud and clear as well. And that was without any kind of acoustical 'anything' for them to bounce their sound off of.
My other impression was the organist was fighting to keep control of the organ. He seemed to be constantly changing stops and making adjustments. He probably just needed more time to practice that particular part, on that particular organ. Also, if he had been practicing on that organ earlier, they may not have had the Meyer system turned on! Thus, he wouldn't have heard what the hall and his instrument would sound like in the heat of battle.