I can say with 100% certainty that the Ref 110 is a better sounding amp over the HD 220. Audio Research Ref products are much different then the none Ref products. It's not even close...
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Read Robert Reina`s review of the ARC Ref 110 in Stereophile, vol 30 #8, 2007.
Tonal accuracy and inner layers of micro detail retreival and dynamic stability is what the 110`s are all about.
This review may cost you some cash, it has haunted me since I read it, I may retire my ARC Classic 120 Monoblocks and get the Ref 110. (power is about the same)
His review is so compelling you can`t get it out of your head if your thinking of upgrading your ARC power.
I encourage you to conduct your own auditions. I am fortunate to have a dealer who has all available for audition, and I was impressed with the full range of Audio Research products including the Ref line, the HD 220, the VS-115. In my opinion, the ref products do not outshine the HD 220 and the VS-115 in a "night and day comparison". It just depends on how much you wish to spend for an incremental improvement in sound.
Having said this, I auditioned all, had the money to purchase all, and was pleased to purchase the VS-115. It provided the best sonics for my system, even at a cost savings. Money should not always be the reason to drive the train in a certain direction.
Best of luck