I have been a long time owner and supporter of Audio Research thanks to a friend in the 70's that had the M 100 amps. I always enjoyed the sound they produced in his system. However, I must admit that the new generation of their amps do sound really good. I used them at the store to audition and eventually purchase my Wilson speakers. I guess the term would be the older amps were more "romantic" in their midrange and treble presentation. I also feel the newer amps have better bass reproduction. Just my opinion.
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