It can be confusing with all the models. Its best to take your time and go listen for yourself.Everyone hears differently and likes different sound. I know that does not help, but I can tell you my picks. You must consider what amp and speakers you will be using (along with what speaker cables). I have listened to most of A.R. Pre-Amps and have owned the LS3, the LS2B Mk2 and the Ref2 Mk2. I also use the Classe Omega Amp with the Revel Salons.With the money I have involved in amp&speakers I thought that I must have the REF 2. But I found it to be to "tubey" sounding and did not like the gain at all. I went back to the LS2B Mk II. Newer and more exspensive does not always mean better.I put the LS2 up against the the LS 15 I prefered the LS2 alot. Balanced definitly makes alot of difference. I just think for around $1000 the LS2 is a nice "Bang" for the buck Pre-Amp. For what its worth it was "Classe A or B in Stereophile. Good Luck!
