I posted earlier about my problem of ordering the Theater 7Pi kit (The older TWO WAY version) and moving to a place where there are no suitable corners to use them. You suggested that I Put the parts in a Theater 4pi configuration. That sounds like an excellent idea. That would work in my situation.

Question, is the TWO WAY crossover I received with my Theater 7Pi kit the same as you get with the Theater 4Pi kit, and can I just go ahead and use the Theater 7Pi kit in a Theater 4Pi box?

That would be fantastic if I could do that. Also, I read where the use of a 811b Altec horn with the 2002 driver I had was an excellent combination. There was a post of a guy wanting to make a Model 19 clone with Theater 4pi parts and an 811b horn.

THAT would do the trick for me, and make my happy meter spin if I could do that.

Can you send me the Theater 4Pi plans?

I feel the magic beginning to happen again. I HATE moving and having to change all of your plans.

This sounds like a great idea!

Thanks! What frequencies does the midhorn cover? Seems like you could build a bass bin and a separate Mid/tweeter box to set on top, ala Altec 19 style, and it could have room and access in it to drivers and crossovers for tweaking, etc.

The midhorn's range allows the use of the standard 1.6kHz tweeter crossover. With the acoustic rolloff of the midhorn, you get perfectly matched curves when the midhorn and tweeter mouths are flush. Some drivers need a small coil, some don't. Each driver is independently optimized for perfect summing taking position and electrical characteristics into consideration. It really sums nicely with seamless transition between midhorn and tweeter.

The crossover was designed to use the Eminence H290 or π wood tweeter horn. Other tweeter horns may or may not sum properly, especially if length or dispersion characteristics are much different. For example, the Altec 811 will probably need to be positioned differently to get summing right. You'll probably need to move it forward a few inches.

I guess I don't understand why a Theater 7 needs a midhorn, when the Theater 4 gets raves for good sound while just being a two way. I'm sure it's well thought out, but I am interested in what the benefits are and general impressions of the sound difference between the two.

I suppose there's a certain "Look" of that big 811b that just has a certain appeal...it looks cool, I suppose, but the sound is the thing.