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most amps nowadays noise signal ratio are rated at least 90db, that anything above that is inaudible, even to RTA'a.. 90dB is such a high number already...100dB can't be heard differently.
also it depends on what frequency and how much watt the N/S ratio was rated at. with the same power at 2 and 4ohm, i don't think you can hear the difference. it's like racing in the quarter mile. 14.07 seconds and 14.02 seconds feels the same, and no one can really tell the difference which one is faster, but the 14.02 is technically faster.
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