I believe that the Ref150 and SE version were designed by the original team at ARC and the GS150 was a newer designer at ARC. I heard this from the person I bought my Ref6 from, and he claimed to have a credible source at ARC. Bottom line was that they preferred the REF 150SE sound as being true to "ARC house sound". So there you have it a 2nd hand opinion. I plan on getting the 150SE to replace my Ref75SE.
Good Luck
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