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Inaudible Frequencies
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Hampi
Started Topics :
4
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17
Posted : Mar 19, 2008 02:33:02
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Why do people remove them?
This question has been bugging me for some time. Anyone know the science behind it?
  "DMT is like loading the universe into a gun and firing it into your brain" - Alan Watts |
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Medea
Aedem/Medea
Started Topics :
127
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1132
Posted : Mar 19, 2008 04:00
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Some reasons:
-The main reason, i think, is because we don't hear them=) So why to reproduce?
-Because most of speakers don't reproduce them:)
-Low subs are being removed, because they take too much energy of the amplifier, efficiency would suffer if they weren't...
-Freqs around 7-8 Hz can seriously damage your health, something about resonance with alpha-rhytms of brain...
Freqs above 20 Khz is an open question, some Tannoy monitors can reproduce up to 40 KHz.
http://soundcloud.com/aedem |
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Elad
Tsabeat/Sattel Battle
Started Topics :
158
Posts :
5306
Posted : Mar 19, 2008 04:10
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you meen sub below 30hz and sonic above 20khz
why to remove sub ?
it can take alot of room in the mix , so your sound will not be as clear and powerfull as it can be.
also it makes your music sound like HUMMMM in clubs etc.
why to remove sonic frequency ?
it can make your dog crazy lol
also same thing like the bass , you loose energy on wasted freqs.
beside all that alot of speakers not produce this freqs anyway , and most peaple cant hear above 16khz
www.sattelbattle.com
http://yoavweinberg.weebly.com/ |
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Hampi
Started Topics :
4
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17
Posted : Mar 19, 2008 05:38
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Ah ok thanks for the info.
Isn't the 60hz range where the "hum" is usually at though?
"DMT is like loading the universe into a gun and firing it into your brain" - Alan Watts |
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OhmLine
Started Topics :
8
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137
Posted : Mar 19, 2008 11:25
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60/50Hz is the mains hum.
Elad was talking on a hum that shakes you belly (not in a good way....)
YEEEEES! |
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MadScientist
IsraTrance Full Member
Started Topics :
97
Posts :
1220
Posted : Mar 19, 2008 13:33
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yeap we are most likely talking about infrasound, but luckily most systems cant produce that low frequencies...in fact, here in germany its even forbidden by law that systems reach that frequency range  the thing is, if there are frequencies that match the resonant frequencies of some of your organs, they can even explode if the waves are strong enough...but thats just the worst case, inaudible infrasound can also affect your mind and cause things like fear and psychosis! this was used with big organs in churchs in medieval times for example, to cause something like fear of god or so...tough not consciously I think!
but even if those frequencies dont get played, it will make your mix muddy in some way and steal some space of other elements...
https://soundcloud.com/hazak
"Have you ever had that feeling where you're not sure if you're awake or still dreaming?"
"Hmm, yeah... All the time, man - it's called mescaline. The only way to fly!" |
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Hampi
Started Topics :
4
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17
Posted : Mar 19, 2008 16:18
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Ok, so Im using Sony Soundforge to run a low frequency cut below 20hz, but there doesnt seem to be any way to cut the high frequencies. And in Cubase, all my VST EQ's dont go above 20khz. Is there any plugin that allows me to cut all the sonic frequencies?
Also, is it better to cut them out on each individual track? or should I wait till the tune is fully completed?
"DMT is like loading the universe into a gun and firing it into your brain" - Alan Watts |
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Dharma Lab
Started Topics :
8
Posts :
342
Posted : Mar 19, 2008 21:18
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I've heard of removing the lowend below 30 Hz or so to conserve speaker energy for higher freqs, but I don't recall hearing about rolling off highs to do the same thing.
Glad you asked this question, as these Tannoy 66D's I'm looking at spec up to 51 kHz. The Adam's A7's I am likewise looking at go higher than audible, to 35 kHz.
It occurred to me that despite the fact that we cannot hear these upper frequencies, they continue to affect the other frequency bands that bounce around the room, right? So wouldn't they continue to add peaks & nulls to the other bands?
Keep The Faith,
Christian K. |
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micromusic
Started Topics :
2
Posts :
65
Posted : Mar 19, 2008 21:49
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Everything above 22k is going to be cut out anyway once you master down to 44.1k/16 bit cd format.
but Soundforge has a paragraphic eq with a high shelf (low pass) filter if you need it. it tops out at 20k, though i think it'll still cut out things above it.
back when the vinyl vs cd debates were raging i saw a study that showed that even though people can't hear above 20k, higher frequencies still triggered some brain activity. now whether this 'helped' the music is debatable of course, but the vinyl guys were all over it, especially when talking about some high pitched live string instruments and their harmonics, verses being reproduced on cd without them.
I'm curious about that law in Germany though, what's the lowest frequency you can legally reproduce? 18hz? 15?
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MadScientist
IsraTrance Full Member
Started Topics :
97
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1220
Posted : Mar 19, 2008 22:03
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stuff above 22.05k does not exist if you re producing at a samplerate of 44.1k....all frequencies produced above from synths get aliased before it comes out from the synth
as far as I know about that law, its for the whole infrasound range (below 20hz)...not quite sure if its just for soundsystems and similar stuff, or just forbidden from a certain volume up...I defenately heard about some cases where people got some kind of psychosis from industries near by them causing infrasound waves!
https://soundcloud.com/hazak
"Have you ever had that feeling where you're not sure if you're awake or still dreaming?"
"Hmm, yeah... All the time, man - it's called mescaline. The only way to fly!" |
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Spindrift
Spindrift
Started Topics :
33
Posts :
1560
Posted : Mar 19, 2008 23:57
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Quote:
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On 2008-03-19 04:10, Elad wrote:
why to remove sonic frequency ?
it can make your dog crazy lol
also same thing like the bass , you loose energy on wasted freqs.
beside all that alot of speakers not produce this freqs anyway , and most peaple cant hear above 16khz
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There is very little energy in high frequencies so that's a non-issue.
If you going for 44.1 for the final master I think it's better to leave the filtering of supersonic frequencies to the samplerate converter instead of trying to EQ yourself.
As for removing subs it can help to remove some in some cases...but I'm very much against doing it as a rule. It's very nice when there is some deep subs left on systems that can reproduce them and it's usually not a problem to make a mix contain enough energy even with subs if they are not abnormal.
But if you are after a more sterile sound rather than a warm sound or want to win the loudness wars it can help you acheive that to have a steep HFP around 30-50hz.
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PsyGalaXy
IsraTrance Full Member
Started Topics :
68
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437
Posted : Mar 20, 2008 01:13
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anigbrowl
Started Topics :
2
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26
Posted : Mar 20, 2008 01:42
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Quote:
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why to remove sonic frequency ?
it can make your dog crazy lol |
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Once when I was living in the countryside I made this loop that seemed to attract bats if I left the window open...first I thought 'well it's a bat, it's the country, I guess it's hard for him to find the window to fly out and he's confused.' So I turned out the light and sat on the floor to look at this trippy animal flying around the room - silly things you do when you're stoned. But after a while I was getting tired looking at the bat so I decided to go to bed and let the bat work it out. So I reached over to the computer to stop the loop and shut it down, and as soon as the music ended the bat flew out.
Unfortunately I could never think of a useful purpose for this exciting discovery. I guess it would be great at outdoor horrorcore parties...
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| also same thing like the bass , you loose energy on wasted freqs.
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Actually the energy is not an issue on high frequencies. The higher the frequency, the lower the energy. Realistically, anything up near the 20 KHz area on a techno track is probably digital garbage.
My advice is that when you record or import a sample, roll off anything above 12-15Khz, or even as low as 9Khz. You can use an EQ or just a regular low-pass filter 90% open without any resonance. It's techno, not classical music...none of your sounds are like a stradivarius violin. This is true about amplified sound in general...when I was a studio engineer I realised that only the human voice and acoustic instruments really *need* a beautiful high frequency recording.
Better to take out high freqs from your individual track elements, and leave the top part of the mix for a good quality reverb. If the hi-freq space is messed up with sounds from 10 different tracks, then they will dominate the reverb and your music won't have that nice sense of depth, it will just make people's ears tired. Also it will sound like shit on cheap speakers or small headphones. A gentle analog EQ boost and a really light reverb during mastering usually sounds far better. |
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xrust
IsraTrance Full Member
Started Topics :
63
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1742
Posted : Mar 20, 2008 05:02
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chuck norris can listen under 15 hz 
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MadScientist
IsraTrance Full Member
Started Topics :
97
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1220
Posted : Mar 20, 2008 13:52
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uri geller can listen up to 0.1hz
https://soundcloud.com/hazak
"Have you ever had that feeling where you're not sure if you're awake or still dreaming?"
"Hmm, yeah... All the time, man - it's called mescaline. The only way to fly!" |
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