Looking to upgrade from ARC110 to ARC150 or 150se.
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I can't say but I have the Ref 110 and it is significantly better than my old VT 200 at everything except maybe, bass slam.
SE owners seem to love theirs and the hierarchy of ARC models in general offer improvements from old model to new, standard to reference, and probably reference to SE. To what degree I don't know.
That being said, you could get a pair of Ref 210s for the cost of a 150SE.
Rolling the KT-150s in the Ref 150 made a noticeable difference. Deeper and tighter base, smoother range. But the SE mod took the amp to a different level. Bass was tighter still, more open and transparent, better control over the speakers.
But to be candid, I made the switch over to the SE version many years ago so it is hard to be very specific on details. That said, if you have a chance to A/B the regular 150 with the SE version, the differences will be day and night noticeable.