Crossover designs...

I've just begun wrapping my head around crossover designs, reading about Linkwitz-Reilly (sp?) designs with subwoofer external crossovers and first-order crossovers with Royd and Thiel speakers (both of which I own).

Interested in any discussions about pros and cons of various designs, as well as white papers and links to good reads.

Thank you.
I would advise that, in addition to asking here, you check out the forums at

There are plenty of DIY speakerbuilders there, many quite knowledgeable, and all very helpful to beginners.

also htguide has a mission possible section you will find useful. and diyaudio has some insightful information. zaph audio has some great designs and you can get some insight into hs design philosophy.
Some of the interviews with Richard Vandersteen from their site explain the basics of 1st through 4th order crossovers (rolling of at 6,12,18 or 24 db per octave)and why he chose 1st order in spite of the design challenges they pose. Pretty interesting and amazing for a one time truck driver to suceed in such an undertaking.
Thank you, fellas. Much appreciated.
There is lots of good info out there on the net. Basically, the higher the order, the more phasing problems you are going to have, the more the crossover will color the music, and the more it will cost you. However, it will give you the best control of each driver...

I usually tell my clients, if you want a high order crossover, either pay someone to design it for you or buy the software to design it...

For about $30 you can have one designed using LEAP software

or for about $10 using xoverpor at
In the real world, relatively few crossovers nicely fit an established model, such as "4th order Linkwitz-Riley". In most cases, due to the non-textbook behavior of the drivers, a non-textbook crossover works best. Having heard good and bad speakers of every conceivable crossover type, I no longer have a favorite, aside from "whatever works well" in a particular case.