Speaker crossover articles & references (just links to papers to remind me what I’ve found)
W. M. Leach, Jr., “Electroacoustic System Realizations for the Linkwitz-Riley Crossover Networks,” Journal of the Audio Engineering Society, vol. 35, no. 10, pp. 792-800, October 1987.
AES E-Library Loudspeaker Driver Phase Response: The Neglected Factor in Crossover Network Design
Leach’s book Introduction to Electroacoustics and Audio Amplifier Design (buy it here http://www.kendallhunt.com)
Charlie Laub’s ACD spreadsheet
Crossover Networks from A to Linkwit-Riley
1st – 4th order crossover calculator (no plots)
mini DSP’s article