I owned a W5 and now own a Concentra II, (combination 112 and Synergy pre). They are quite different. I am much happier with the Rowland. It is far more musical. It doesn't have the dynamics of the W5, but provides much more pleasure over the long run. Both are transparent, detailed and have excellent soundstages. The Sim can really control your speakers and has a better bottom end. The Rowland draws me into the music much more and is not fatigueing. The thing that stands out the most is the fact that I grow to like the Concentra more as time goes on and with the Sim, that was not the case. If you listen to rock alone, maybe the Sim. For everything else, the Rowland wins. I also want to say that my preference is, very much, a laid back, smooth sound. That is why the Rowland works for me.
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