I upgraded from an SP9-Mk 2 to the Ref One Mk 2 about a year ago, and the change was dramatic. It's a very lively preamp that throws a huge soundstage. Listening is always involving and never fatiguing. I'm not sure about it being the perfect match for all amps; it apparently has a lean midbass, which mates perfectly with the ARC VT 100 Mk 2, which I use, but could sound anemic with other units. In TAS #111, HP gave the Ref One Mk 2 four stars (on a five-star scale), and in the March 1997 Fi, Jonathan Valin ended his review with this comment: "this, my friends, is the stuff dreams are made of." (He later rated the Ref Two even dreamier.) For more user views, see http://SendThisNow.com/c.e?120DE6 Hope that helps.
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