Paradigm X-30 has controls for x-over frequency, phase, & volume. Two recently sold here on audiogon for $125 & $95. They come up now and then and rarely sell for more than $130.
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Research the Dahlquist DQ-LP1. Passive high-pass/active low pass. Very transparent with a polystyrene in the high-pass. Easy to upgrade, and still being used/supported in the high-end market. (http://www.regnar.com/Dahlquist_Speaker_Parts_Service_Page_DQ-MX1.htm) See page 13: (http://www.avahifi.com/root/audio_basics/ab_pdf/ab1989.pdf) Notice on page one of this review, what is used to bi-amp the system. (http://www.nolaspeakers.com/reviews/tas/exoticaGR_part1.pdf)