John49,
Good question. My dealer had a 600i and not a 700i in stock to loan us. Since we were told both have the same sonic signature but with the 700i taking the bass slam, clearness in the highs, quietness, and soundstage just a little farther, we agreed to demo the 600i. The differences my dealer and the Simaudio exec told me were consistent with what I have read in reviews. Since this is going to be my last amp upgrade in quite a few years, we went with the slightly better and more powerful 700i.
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