Google =phase coherence in speaker crossover design' got me this
https://www.google.com/search?hl=en...coherence+in+speaker+crossover+design&spell=1
Which lead to this- by some guy 'Nelson Pass. Looks interesting. Only read part so far.
http://www.google.com/url?sa=t&rct=...-UtdDLn852ch6k29yYk72Yg&bvm=bv.93564037,d.cGU
https://www.google.com/search?hl=en...coherence+in+speaker+crossover+design&spell=1
Which lead to this- by some guy 'Nelson Pass. Looks interesting. Only read part so far.
http://www.google.com/url?sa=t&rct=...-UtdDLn852ch6k29yYk72Yg&bvm=bv.93564037,d.cGU