Had those many years back. No problem with coherency at all, if set up right. Two stereo amps, if of the same make, are better than one. Four monos are even better.
Thanks for responding. How did you orient the two vertically stacked Quads? In a continous arc or bottom speaker slightly tilted up and top slightly tilted down toward the listener? Did you feel the need for a extra tweeter?
I experimented a lot and ended up finally just as you had suggested. Found extra tweeters essential. Used ribbons by Sequerra, forgot what they were called.
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