I agree with Ron Texas' post. Once the specs are good enough, making them better doesn't get you anything, sonically. It may well matter for better pairs of ears, however. Might make you feel better, though, and maybe that's what's operating there.
Decent audio electronics have been so good for so long that the whole scene has degenerated into a numbers game. No one in the entire known universe is going to hear the difference between a 100dB S/N and 120dB S/N or between 0.003% and 0.0003% distortion. The background noise level of an anechoic chamber is typically 20 to 30dB, and it's more like 40 to 50dB in the average home listening environment. You don't need a PhD in mathematics to calculate how loud the musical peaks would need to be in order to make the noise floor in your electronics audible.
Transducers - mics, phono cartridges, and speakers, for example - are an entirely different matter. Transducers are always the limiting factors in any system, because their noise and distortion levels are thousands of times greater than the levels in their associated electronics. Improvement in transducer technology and performance represents the final frontier in the world of audio.
Many companies claim to have discovered the magic bullet in reducing transducer noise and distortion, but the truth of the matter is than none of them has. New designs, esoteric material choices, and novel manufacturing techniques over the last few decades have have not yielded significant improvements in fidelity. If they had, every manufacturer would be following suit, and speakers would begin to sound more and more alike as their costs increase. This is not the case. There is no convergence in the upper price range of transducers.