I have not had the opportunity to listen to Audio Research preamps, but there seems to be a few good ones to hold onto for the long term: SP10, SP11, SP14, SP17, LS17, LS17SE, LS25 MKI, LS26, LS 27, Ref 3 & 5
I have listened to the newer ARC pre-amps over the last 3 years and would conclude this; If you seek the best of the newest gear- look no further than the Reference5/5SE.
Otherwise, feel free to audition some of the older pieces for a comparison. All of this will be very dependent upon your gear and cables/cords. Keep me posted. Happy Listening!
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