The Audio Research ref 2 preamp that I have was bought used on Auidiogon for $4000.00..

This is about Reference 2 MKII.

I have recently upgraded from the LS25 MkII to the REF2 MkII. Reviews of the REF1 and REF2 MkI preamps are really not relevant as the MkII is essentially a completely different preamp. Same issue with LS25 MkI vs. Mk II.

Great preamps, it offer an execptional soundstage and liquid sound. I had for five years LS-22 (the best ever hear for the price); don't listen him before 200 hours of initial warm-up. Good match together Classe' Audio DR15 and ProAC.

Much better than Sonic Frontier Line-3. My CD's sound so much better on this unit. Easy to use. One piece unit is a big plus. Very reliable. Remote control is excellent.