I would never buy them because their expense is way over the top for me. Additionally they have a huge spike in their FR, and would need equalization.But what reasons do you have THY, for not using them. Surely if you put the tweeters 6 to 8 inches in front of the woofer coils you will need to put in a time delay, but with the Behringer, I assumed that the poster would do that.
I should think that horizontal woofer to tweeter combing wouldn't matter.
But I'd be interested in your reasons for not choosing this design, it seems viable, though the RD75 is not my choice.
Marlboro