i dont think so because it is analogue and the analog circuitry doesnt always output the same exact amount of current; there will always be some surge, sag, voltage, current difference, weakening or whatever.
so i dont get how there could be anyway to measure accuracy with audio if it goes from a digital medium to a dac to an analog amp to speakers.
if im wrong and audio output can be measured by accuracy, then what equipment and setup will reach a peak of 6 9s accuracy or more?
i wouldnt notice it of course, because every time i play a track from my hard drive it should never sound the same.
I'm am not sure where you got the idea that analog circuitry would be so inconsistent that we wouldn't be able to measure it accurately. This might be true of really, really cheap gear, but anything decent can be repeatedly measured with very consistent results assuming it's done in the same environment and on the same system. All you have to do is look at measurements of audio gear (DACs, amps, speakers, headphones, etc.) to see the consistency and accuracy in measurements. Many folks also give pretty detailed accounts of their measurement systems and techniques.
In fact, there are actually many, many types of accurate measurements that can be done on audio equipment. Some of them include the frequency response (usually in a graph), cumulative spectrum decay, noise, distortion (of different types), square wave response, impulse response, output and input impedance, power output...I'm probably just scratching the surface here.
Now, there are a couple problems involving audio measurements. We're not entirely sure how every aspect we can measure will interact with other aspects, we're not 100% sure how some measurements map to human hearing, and tests used for measurements don't use music. Music itself is complex and variable, and it's very hard to design measurements around it. But, that's not to say there isn't an extensive knowledge and understanding behind it and how it all works together to produce what we hear. It's just not quite perfect and complete. Enough is known and understood that humans can get very close to creating equipment that almost 100% accurately reproduces audio. Human hearing is extremely complicated as-is, which is another factor to consider, though, again, much is known and understood about it.
Now, using speakers or headphones to reproduce audio with close to 100% accuracy is the hard part. It's not easy to get a perfectly flat response with no resonance or ringing, low noise, low distortion, and so on. We can get very close, and we can consistently recreate products with almost no variability in their performance from unit to unit, but I'm not aware of anything that is 100% accurate.
In terms of objectivity, we're pretty close to being able to understand and reproduce perfect audio. In terms of subjectivity, well...personal tastes and differences are a whole different beast to tackle.
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