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The Altecs that I use were designed for vocal clarity and do it very well indeed at higher active crossover frequency. FWIW the Yamaha Pro amp I use up to 500Hz is said, by Yamaha, to be designed for vocal clarity.
Lower x-over would be better. With care I can get it down to 300HZ. Not bad for a 15 inch LF driver and CD medium-size horn combo. Raising the x-over freq to 800Hz is another option. What fun.