虽然预主题不符
既然提到数码技术的趋势未必能逆转和电子分音技术的好处，何不用数码分频， 做到完全线性和0失真（在数码领域）。
http://www.stereophile.com/shownews.cgi?969
http://www.stereophile.com/showarchives.cgi?744
http://www.clarityeq.com/
http://www.ipl.iit.edu/IPL_papers/SP99.PDF
http://home.pacbell.net/donwm/
http://www.audigo.com/docs/digxover.htm
http://www.tbrowne.demon.co.uk/comp/projects/speaker.htm
http://hook.pz.zgora.pl/~ksozansk/files/ECCTD97.pdf
http://www.prosound.co.nz/index.htm?effects/alto-fx-page2.htm~mainFrame
http://www.altomobile.com/html/crossovers.html
http://www.proaudioreview.com/par/march01/KLARK-TEKNIK-DN9848-web.shtml
http://www.ashly.com/d_crossover.htm
http://www.labgruppen.se/lab.dsp.html
http://www.showco.com/products/DCS/
http://www.uslinc.com/products/xta.htm
成品：
http://www.meridian.co.uk/p_d8k.htm
