What is best tweeter height for the Devore O/96?

Erik and Charles,  Many thanks for your comments. I agree.

Wow, you don't get a speaker like the O/96 made by some guy who through a couple of drivers in a box and got lucky.   This is a speaker I would love to try sometime.

This may be viewed as sacrilege, but let me ask you anyway: Does the Orangutan produce images at a height you find satisfactory? If yes, nothing more need be said. If no, here's a radical idea you could consider: Make stands for the speakers that raise them to a height that results in them producing the image height you desire. Yes, the time alignment of the drivers will then be not as designed, but the enclosures can be tilted forward until the driver alignment is restored to factory. The image height will be raised, but the speaker sound will as intended. That is, unless the boundary effect of the floor was a design element in the voicing of the speaker, a very real (perhaps even probable) possibility. In that case, if you desire a higher image you'll need a different speaker.

In my experience, the Orangutan produces an image height that is entirely satisfactory, with image height higher than the speaker cabinet.  The O/96 can produce a very wide soundstage with excellent height too, when properly set-up.  This apparently is exactly what Devore intended, with listening axis slightly above the upper edge of the speaker cabinet.  The speaker sounds somewhat taller than you'd expect.  :-)   They have excellent clarity and imaging while producing a rich and musical tone with great dynamics.

Wasn't Mark Levinson lacking in the technical education most audio designers had obtained? A musician certainly, but an esthetic sense can have value when applied to technical design goals which was also seemingly exemplified by Steve Jobs…RISD indeed.