what is difference of klipsch cornwall II & mkII ?

I believe the original Cornwalls were made up until 1985, then the Cornwall II's were made until the early 90's, I think. Now they have the Cornwall III's, which are much more expensive. Don't think there is any difference between Cornwall II and Cornwall Mk II. I own a pair of Cornwall II's, from the first year of their production. They are great speakers. They usually go used (depending on their condition, of course) anywhere between $600 and $1500. I think in the last year or so they have averaged between $900 and $1200 on this site.

You will not get better dynamics, both loud and soft, than with horn speakers, this is one of their greatest virtues. They also image and soundstage very well, and are good for any type of music. There is a thread probably about a month old or more on the high efficiency asylum where many different people wrote about why they consider horns the best speaker type. I would suggest looking that one up - I'm not good at providing links, etc., so I won't try.