Audilabyrinth, First, 66000 & M9500 have a similar sound and sonic signature. Of course there are differences but sonically I don't see them make or break either speaker. Visually I like both but the DD66000 is a stunner, a real classic beauty. The M9500 is more utilitarian in appearance but still quite pleasant.
The 66000 has a smoother midrange and the addition of the super tweeter adds a feeling of extension and air on top. The M9500 has the better bass, I haven't had a 67000 in my room to comment on. You shouldn't worry about the batteries in xover, just check them and change them every 3-4 years. I have them in the M9500 too.
Here's a link to a brief history of the K2, S9500 & M9500.
http://audioheritage.org/html/profiles/jbl/k2.htm
You can also go to my System link, I have the M9500 in the near field setup.
david
The 66000 has a smoother midrange and the addition of the super tweeter adds a feeling of extension and air on top. The M9500 has the better bass, I haven't had a 67000 in my room to comment on. You shouldn't worry about the batteries in xover, just check them and change them every 3-4 years. I have them in the M9500 too.
Here's a link to a brief history of the K2, S9500 & M9500.
http://audioheritage.org/html/profiles/jbl/k2.htm
You can also go to my System link, I have the M9500 in the near field setup.
david