What config were the mics??? What type of caps were being run???
I'm not positive, but my guess would be that they were running 2 cards(or maybe hypers) and 2 omnis... 2 of which would be in a stereo config (XY, ORTF, or DIN) and the other 2 would be in a spilt omni config...
That's just a guess though...
If that's what was being run, they were probably trying to get the best of both worlds (cards and omnis) into one pull...
Again, that's just a guess...