PS AUDIO: We often ask ourselves what’s audible and what’s not

We can say with some confidence 10% distortion is audible, but is 0.1%?

And, compared to what? Can we hear the difference between 0.1% THD and 0.0001% THD?

There comes a point in measurements where one must decide what matters and what does not. It probably doesn’t matter, for example, that one wheel of your car might be 1/10th of an inch different in diameter than another. On the other hand, 1/10th of an inch parts variability in a Swiss watch might be the difference between functioning and non-functioning.

From my perspective, once we hit THD and IM levels below 0.1% the differences become more academic than audible.

And yet we hear major differences between differing topologies producing dramatically different levels of distortion.

What that suggests is simple. Beyond a certain point, the level of distortion becomes meaningless.

How those differing levels are achieved is where we find the bulk of sonic differences.

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