My experience is that the rated power output of an amplifier is not always a good predictor of ability to play loudly or to produce wide dynamics. I don't have much experience with the Ref 75SE but I do own a Ref 150. I upgraded to the Ref 150 from a VS115, which was a power increase from 120 W/ch to 150 W/ch. That's hardly a big change in power yet the Ref 150 has much enhanced dynamics and plays considerably more comfortably at higher sound levels than the VS115, not that the latter was a bad amp at all.
An audition with your speakers is the best way to determine if the amp satisfies your needs.
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