Active Crossover Page

Erik Brewster's Active vs Passive crossover discussion at: http://home.inreach.com/ebrewste/cross.html

Rane Corp's website for TONS of quality discussion of active crossovers, grounding and awesome App Notes: http://www.rane.com/

Alex Megan's DIY active crossover:  http://www.soton.ac.uk/~apm3/diyaudio/AXO.html.

Luc Henderieckx's page http://users.pandora.be/airborne

True Audio has a spreadsheet to calc values for a 'Linkowitz transform' circuit: http://www.trueaudio.com/

Audio electronic schematics: http://www.linkline.com/personal/phorn/audio/rss_schematics.html

Advanced power supply:  http://communities.msn.com/DIYElectronics

Commercial crossover kit:   Marchand Electronics Inc.