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Steep High freq rolls offs in mastering - counter-productive?
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Old 21st September 2012   #1
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Steep High freq rolls offs in mastering - counter-productive?

Hey guys,



Just something i thought of the other day when discussing techniques with another Dance music producer, when we were discussing mastering he explained he always rolled off from 17 or so k in his master quite steeply, from memory 26 or 48dB. When i asked him why he didn't know :P. What's the point of doing something if you don't know why.

After 'testing' quite a lot of Dance tracks from all different genre's, the ones that i perceived as sounding dull, less clean and flat to me more often than not had a steep high freq roll off when analyzed, from anywhere between 18 or so down to 15, yes 15 =\. The tracks in question were legitimate WAV final masters.

To me, steep roll offs don't make sense. I've mastered tracks before that had loads of high end energy that was tamed with a subtle high freq roll off, but anything steep to me completely baffles me. Most of the target audience in dance music are younger people too who probably still have pretty good hearing, so to me it's shooting yourself in the foot.

So my question is, is there something I'm missing here? Is there a logical explanation deeming steep lowpassing necessary - especially in WAV masters. I've read and heard that extreme high frequency roll off's may be able to improve the compression result when encoding to MP3 considering there will be less data needing to be compressed, but I'm skeptical and haven't tested this theory out properly myself.
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Old 21st September 2012   #2
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it doesn't make any sense. i've never heard of any top engineers that actually have ever done that in the past.
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Old 21st September 2012   #3
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Stuff can get rolled off when you convert to mp3, but not as low as 15 khz.
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Old 21st September 2012   #4
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it doesn't make any sense. i've never heard of any top engineers that actually have ever done that in the past.
Glad i'm not alone thinking this. Haven't seen it in any other genres of music either =\. In the tracks i heard and analyzed - it was definitely deliberate. They were all exact final WAV masters.
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Old 21st September 2012   #5
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Stuff can get rolled off when you convert to mp3, but not as low as 15 khz.
Yeah agreed. As far as I'm aware, 128kbps MP3's start to roll off around there - why the **** would you put a brick wall filter there for your WAV masters? :S, Boggles my mind.
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Old 21st September 2012   #6
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It's done quite a bit. Robert Babicz does it, and he knows a thing or two about engineering and mastering. Ask him about it, he posts here from time to time.
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Old 21st September 2012   #7
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Originally Posted by Starstruck View Post
Yeah agreed. As far as I'm aware, 128kbps MP3's start to roll off around there - why the **** would you put a brick wall filter there for your WAV masters? :S, Boggles my mind.
I have noticed that converting to MP3 sometimes means going back to mastering to EQ again. It can go both ways. Mp3 compression can increase or decrease brightness. not everyone is using the same codecs. if you roll off at 17k in the WAV you will have a louder, clearer, more detailed recording as an mp3. I would not do it myself on a dance recording because I'm usually loosing brightness when I go to Mp3. I think a flat EQ is more desirable.
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Old 21st September 2012   #8
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Only time I roll a little off the 17-18k range is if its going to vinyl (and most do), but even then its usually because I think its too sizzly anyway--and the tip-top of the freq spectrum is one of the easier things to fix in mastering, if necessary.
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