tweeter magnet and crossover

I don't know about that.  I see inductors on the same plane 1 or 2 inches away from each other all the time.  If one of the inductors was standing on end (90 degrees), that would be fine.  But that would also cause the overall size of the crossover to be larger (more height), which would result in more cost in manufacturing and delivery.  That is why I suppose the coils are left lying flat next to each other.Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

stevdart wrote: jmelton86:  As haemphyst explained to me recently, a static inductor (voice coil) won't affect a dynamic inductor (crossover coil), or vice versa.  They can be placed closely and oriented on the same plane.

I think I said that a static magnetic field (the magnet in the speaker, not the coil of wire that is the voice coil) won't affect a dynamic magnetic field (the inductor in the crossover). That is why it is OK to place your crossover immediately behind, or in close relationship to, the motor structure of most midrange or tweeter components. Even most woofers won't be able to generate the necessary field from the voice coil to affect a nearby inductor. However, the voice coil, if rediculously powered enough, (WAY up in the hundreds of watts range) COULD conceiveably generate enough field the escape the bounds of the motor structure, and affect the field of a nearby crossover inductor. That'd be about all you have to worry about. The 4 or 5 inches referenced by stevdart above will be sufficient in 99+% of your applications.It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."