I just upgraded my LS15 to a Ref 2 mkI and it's awesome. I never heard a Ref 1, but I couldn't be happier with my decision. Like the previous guy said, the soundstage is huge and subtleties more pronounced. Now I can understand why people have said, spend more money on the pre-amp versus the amp. I also use a ARC VT100 mkII with my Ref 2, fantastic combo.
Audio Research Reference-1 reviews
I can't locate any reviews for the Audio Research Reference 1 preamp. So all you audiophiles who own/owned one, I would appreciate your reviews/opinions. I currently have a Audio Research LS-16 preamp, Meridian 508.24 CDP, Plinius SA100MKII Amp, and Dynaudio Contour 3.3 speakers. Using Nordost SPM XLR (on the Meridian) and NBS Monitor IV XLR interconnects with NBS Monitor III speaker cables. Yes, I'm considering upgrading to the Ref-1.