Peter - I am a bit curious - wouldn't putting a large tweeter above the driver in the Ohms ruinn the upward radiation of sound? AFAIK, I think that is a big part of the Ohm sound. I have thought about adding a supertweeter to my Ohms, especially one of the omni designs out there, but short of mounting it on a high stand just behind the speaker, I am hesitant to place anything above the cans. I love the hieght projection I get from my Ohms, and I would hate to lose or diminish it.
Separately, I am trying new wires for my DAC-to-preamp run, and it is very interesting. First, I was thrilled to hear that the 2000s easily and dramatically revealed the differences in the original cable and the new one. The balance has shifted, and now, the occassional rough patch in the lower treble-upper mids that I attributed to the speaker has moved down in frequency, to the midrange. It is the lesser of two evils, and the cable needs more time to break in, so I am hoepful. Most of all, the issue I was having with voices, in which the sibilants seemed separated in space from the rest of the voice is gone. Just like that - sibilants are anchored to the voices in space. And my soundstage is bigger than ever. On most recordings, the 2000s simply vanish, replaced by music that just hangs in space across the front of my room. Wonderful!