Can anyone shed some light on the quality of Acoustic Research speakers? I didn't find much on them with a search. I am looking to replace some very old Mitsubish towers I am using for my mains. Don't have a sub right now but I am probably going to order a Rava from adire. I have seen the AR S50 towers for around $400 a pair. I can't find any reviews execpt for the ones at audioreview.com but I don't think everyone there has the expertise as users in the forums here do. Anyone have some experience with the S50 series or Acoustic Research speakers in general?