One could think it is the back that needs to be a certain distance from the wall or in a corner like a Klipsch horn but the coaxial horn must face the listener.
The angle makes no sense to me. The mid/high range horn already has a deflector so you don't want to reflect it off the ceiling or anything.
I have seen versions of the 604 in cinemas and they can fill the whole room with 20W rms !
The 604 is famous but don't attach it to a 100W per channel amp! Some early ones were rated only 25-35W, later models around 60W.
My Braun amp with it's 2 x 40W rms is a perfect match
Check out how it is usually installed:
Edit: I actually found that enclosure way down in the duckduckgo image collection but in a desolate condition. However it links to something totally different unfortunately.
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