Originally Posted by speakerdave
I've enjoyed reading about your work on this project. Your enthusiasm and your way of getting on with it have inspired me to get out in the garage and make some sawdust myself.
I would think that on their sides would be best because that is the position in which the one tweeter will be lowest. That 2405 tweeter has a fairly narrow vertical dispersion (16kHz is 6 dB down at 15 degrees off axis). It would be worthwhile to cut another tweeter mounting hole in one of the cabinets on the opposite side of the midhorn so that you can have true mirror imaging in the horizontal orientation with the tweeters lowest, and experiment with turning the fins on the midhorn so they angle up and diffract down into the listening area.
Also, I wouldn't worry about wearing out the LE15's, but if something should happen to them, the woofer to replace them would be the 1500Al. You could start a little fund right now and have the money when you need them. ;)
Additional Note (for other readers): You've been referring to the 3113 crossover; I assume you mean the 3133.
David