Oops, for corssovers, i use locked crossovers (electronic, and some passive), 
the electronic crossovers are the Elite ex-401's (90 hz and 500 hz cutoffs). 
As for passive crossovers, i try to avoid using them, i get phasing problems 
between speakers.  And YES, like you mentioned and reminded me, i may need a 
small delay circuit (NOT REVERB) to time the difference between the yamaha 
4115's and the rest of my cabinets, which are front loaded, not horn loaded 
like my yamaha's.
Laszlo
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