What eliminates? The 15"s now do <500Hz both which is going to cause some serious issues in the lo-mid due to phasing, unless the upper is high-passed at 500Hz which I highly doubt it is unless it was a highly specialized, coaxial midrange speaker (ie. squawker) or something.this eliminates the comb filtering that would occur with both 15" drivers operating at those frequencies.
I've seen CD horns and horn lenses tech specs state crossover points at 600-800Hz but they become honky and many prefer to xover them higher, like 1..1,2kHz or even 1,8..2kHz (speech contains the most information in the 2,5kHz region which our ears amplify naturally)15" drivers really should never be run up that high but large format compression drivers that can crossover at lower frequencies are quite expensive so they aren't found in budget boxes.
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