Actually there was a minor chnage in Tweeter design
and supposedly a very slight x-over change. We are talking the Reference line? LIke Ref 20- 40- 60-80-100 ver.2 correct?
This change over occured 2 1/2 years ago.
There is not much differnce in sound from the ver.1 to the ver.2 speakers. This occured about the same time there was a cosmetic change from the non-descript stright sides to the present curves. SOme gloden ears feel the sound is not as harsh or bright. This may be true at high power. A weak point in the Ver.1 series. As the vloume went up the Tweeter became a bit bright especially off axis Frq. response.