Well Merry Christmas to you Sfstereo! Wait until you have ~650 hours on it, that seems to be where it fully settles in and then the Ref 5 sounds amazing!
I am very confused about this SE version you are talking about, first off, owning the 40th AE I can tell you that almost no part from the power supply of the 40th AE would or could fit into the single chassis Ref 5 (I just solid mine BTW)
ARC has nothing about this on their site and a goo ogle search reveals nothing, where did you buy this????
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