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In Reply to: RE: Can you explain posted by tcell on September 22, 2015 at 10:56:59
Sure, but before I do I would like to change my answer to a 24/48, or 16/48 master file, not a 16/44.
It's a textbook case because when the musical content stops at 24kHz, then it's empty black all the way to 48khz. The empty black means there is 0 high frequency content.
Now take another look at the Mp3 charts. They do pretty much the same thing. Look at the bottom one with the green spectrograph. The cut-off frequency is 9.4kHz. That's a sample rate of 18.8kHz. Everything to the right of the cut-off is empty green. It's kind of hard to say that a sample rate of 18 could be labeled as 96.
Now go back and look at the first graph that was labeled good. Notice how it has musical content all the way to 48kHz on the very far right. Notice also how the roll-off is very natural and gradual.
Keep in mind that all the graphs have the same scale. They all measure to 48kHz. It's just some of the files measure all the way to the right. Some measure to the middle, and some to the left on the scale.
On a different note, do you think I should keep posting these reviews? I'm pretty sure there are people out there who would want to read them. I have a feeling it would save somebody some money.
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Big speakers and little amps blew my mind!
Follow Ups:
I also saw the energy between 22-24 kHz and assumed it meant a 48kHz source. I also did not see how you could tell between a 16 bit or 24 bit source. Is there a way to do that? I do think this information is useful before purchasing - I use Audacity spectrum plots and also have seen "hi-res" files that seem to have been upsampled. To be honest, there are a lot of "true" 24-96 and 24-192 files that my ear cannot reliably distinguish from a Redbook 16-44 version of the same master. It's a journey...
Sorry I was ticked off, in a hurry, and trying to make a point. I'll try to be more careful next time, but either 44 or 48 would lead me to the same conclusion about the 24/96 file.
Musicscope doesn't save the total dynamic range, which is how you figure the bit depth. The total DR only shows on the cursor, and the only way I can record that is with a screenshot. PITA. I'll try a new way of showing two versions of the same measurement, so anybody can figure out the bit depth, which is divide the DR by 6.
I can't really hear a difference with symphonic music, but anything with the human voice I can. I think hi-res is all about low level detail, and what that brings to the music.
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Big speakers and little amps blew my mind!
> On a different note, do you think I should keep posting these reviews?
Yes! This is the first time I've seen one of your reviews and I find it quite interesting. What sort of software do you use to display these spectrum analyses for determining resolution.
Thanks,
John Elison
Thanks John. It's called Musicscope, and jusbe put me onto it.
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Big speakers and little amps blew my mind!
+1
Bill
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