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Those added subwoofers for CEOTTK were added to just two theaters: one in California and the Ziegfeld in NYC. The two systems were slightly different (there was an article published years ago about this, perhaps in "db" or in "Recording Engineer/Producer"), but I believe the NYC installation...

Yes, thanks - I knew all of that except for the comments about the phase problems in filters, although if you think about it, if the LFE was out of phase with the high frequencies of the split surrounds, it probably would have made no audible difference and due to the different frequencies...

How can the 5.1 be the original theatrical (and I presume you mean 70mm) track? In the 70mm Dolby Baby Boom format before Apocalypse Now, the surrounds were mono and there were two LFE tracks (channels 2 and 4). Now in a 5.1, they can send the LFE tracks to the .1 and the surrounds can be...