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I would be real cautious on loading the 375's with that short of a horn. it's real close to the cutoff and anything below that makes the diaphram move in unnatural ways..:(
If you are using the 077, stick wth the original long 2312 ( H92 ) horn and the 1" driver. You can use the more robust titanium since the crossover to the 077 minimizes the "trashcan" artifacts some claim to here ( I know I am gonna get flak for that one ).
If you need drivers, I have a pile sitting unused..
Sub