My concern is about the internal operating bit-depth Sound Check uses when it makes the volume adjustment. So the concern I have with Sound Check has nothing to do with the integrity of the music files themselves, and it has nothing to do with dynamic range or compression. It preserves 100% of the dynamics - and as notes, Sound Check leaves the music file itself untouched. It's normalization - simply an automated and more precise version of what you do when you turn the volume up or down on your preamp, integrated amp, or whatever. I would love to know if or anyone else has done any actual testing of this, and even if not, I'd be grateful if anyone has any clearer knowledge about Sound Check's under-the-hood operation, or a more evidence-backed sense than me of whether or not it's worth even being concerned about it at all.Īs has noted just above, this is not compression like on FM radio. if its 16 bits (when playing/adjusting 16-bit content), that could in some cases be an issue, especially depending on whether not the adjustment uses dither. If it's 24 bits, not ideal but almost certainly inaudible, even when adjusting 24-bit content To my mind - and I am happy to be corrected here - I would say any concerns about Sound Check could therefore be roughly categorized as follows: But while that is a plausible hypothesis, it's far from certain - it also seems possible that the adjustment could be done at the bit depth of whatever music file is being adjusted, in which case redbook files could be adjusted using only 16 bits. Since Sound Check is an adjustment in the master volume control and not the music file, it is plausible to hypothesize that the adjustment is done either at 32 bits, or else at whatever bit depth is set for the output in the Audio MIDI utility. How much does Apple Music's "Sound Check" volume normalization feature degrade noise performance/effective bit depth? gave a nice and very reasonable response, but I was wondering if anyone has actually done any testing or has any specific technical insight: Raised this question in a thread about another, tangentially related topic.
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