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Post by cheglie on May 3, 2014 17:54:58 GMT -5
Question came to my mind as sometimes they do. I have a sub rated to 23hz. I have seen some even lower as 16hz for example. My question is, in order for a sub to hit those lows they (low frequencies) must exist in the recording? Correct? Or am I missing something here? Just how low in the frequencies do the artists record?
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hemster
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Post by hemster on May 3, 2014 18:09:48 GMT -5
Not so much for music (although organ music and some drums are low frequencies), but many movies have sound in the 20-30Hz range if not lower. At those frequencies, the effect is both felt and heard - which can be quite visceral.
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Post by Topend on May 3, 2014 18:13:33 GMT -5
In the movie "How to Train Your Dragon", it is reported there is a scene that goes down to 5Hz. You won't hear it but you will feel it if your sub is able to reproduce it.
I think a sub that goes down to 15Hz will cover the LFE of most movies.
Dave.
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Post by Topend on May 3, 2014 18:15:26 GMT -5
For music then I would agree with Hemster.
Dave.
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Post by garbulky on May 3, 2014 19:06:13 GMT -5
It's not easy for subs to go low. If a sub actually goes that low it has to be clearly rated for it. For instance not 16-80hz. For instance a +/- 3db point. It also helps to know what level they are measuring this at. Here's a good example: www.powersoundaudio.com/collections/power-x/products/xv15se |
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Post by Jean Genie on May 3, 2014 20:25:51 GMT -5
It's not easy for subs to go low. If a sub actually goes that low it has to be clearly rated for it. For instance not 16-80hz. For instance a +/- 3db point. It also helps to know what level they are measuring this at. Here's a good example: www.powersoundaudio.com/collections/power-x/products/xv15se"For instance not 16-80hz. For instance a +/- 3db point." :-/Huh?  |
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Post by garbulky on May 3, 2014 22:52:10 GMT -5
It's not easy for subs to go low. If a sub actually goes that low it has to be clearly rated for it. For instance not 16-80hz. For instance a +/- 3db point. It also helps to know what level they are measuring this at. Here's a good example: www.powersoundaudio.com/collections/power-x/products/xv15se"For instance not 16-80hz. For instance a +/- 3db point." :-/Huh? Are you telling me you don't speak fluent gibberish??  Some days I speak gibberish but other times I speak Gibbon-ish.  I meant a frequency response like 16-80 hz is meaningless without the +/- 3db point. And it also helps if they specify +/-3db from what level... .say 80 db (rather than 50 db). |
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Post by jmilton on May 4, 2014 19:10:19 GMT -5
Question came to my mind as sometimes they do. I have a sub rated to 23hz. I have seen some even lower as 16hz for example. My question is, in order for a sub to hit those lows they (low frequencies) must exist in the recording? Correct? Or am I missing something here? Just how low in the frequencies do the artists record? . If you can't hear 16 hz, how does one record it? |
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Post by Keith M on May 4, 2014 19:34:46 GMT -5
Question came to my mind as sometimes they do. I have a sub rated to 23hz. I have seen some even lower as 16hz for example. My question is, in order for a sub to hit those lows they (low frequencies) must exist in the recording? Correct? Or am I missing something here? Just how low in the frequencies do the artists record? . If you can't hear 16 hz, how does one record it? Humans can't hear it, but that doesn't mean it doesn't exist. The average human can hear sounds between 20Hz and 20kHz (age dependent of course) but sounds exist outside that range. Just like light, we see a limited amount of the available bandwidth of light, but IR we can't see, but there's obviously equipment that can detect it. |
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hemster
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Post by hemster on May 4, 2014 22:15:22 GMT -5
Question came to my mind as sometimes they do. I have a sub rated to 23hz. I have seen some even lower as 16hz for example. My question is, in order for a sub to hit those lows they (low frequencies) must exist in the recording? Correct? Or am I missing something here? Just how low in the frequencies do the artists record? . If you can't hear 16 hz, how does one record it? Easy. One records 32 Hz and halves it. |
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Post by pop on May 5, 2014 8:34:08 GMT -5
. If you can't hear 16 hz, how does one record it? Easy. One records 32 Hz and halves it. Just like when you pass that thing your always smokin'. We halved it.  Also, I noticed Gar posted a picture of some of your cousins. How are Lou and Loretta? |
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hemster
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Post by hemster on May 5, 2014 9:35:24 GMT -5
Easy. One records 32 Hz and halves it. Just like when you pass that thing your always smokin'. We halved it. But it only counts when I inhale, right?  Easy. One records 32 Hz and halves it. Also, I noticed Gar posted a picture of some of your cousins. How are Lou and Loretta? They're celebrating their intellectual superiority against humans. Thanks for asking. |
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KeithL
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Post by KeithL on May 5, 2014 9:50:19 GMT -5
That just reminds me of my favorite quote from Hitchhiker's Guide to the Galaxy...... “For instance, on the planet Earth, man had always assumed that he was more intelligent than dolphins because he had achieved so much—the wheel, New York, wars and so on—whilst all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man—for precisely the same reasons.” Easy. One records 32 Hz and halves it. Just like when you pass that thing your always smokin'. We halved it. Also, I noticed Gar posted a picture of some of your cousins. How are Lou and Loretta? |
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Post by Jim on May 5, 2014 9:58:41 GMT -5
In the movie "How to Train Your Dragon", it is reported there is a scene that goes down to 5Hz. You won't hear it but you will feel it if your sub is able to reproduce it. I think a sub that goes down to 15Hz will cover the LFE of most movies. Dave. Black Hawk Down's "F'n Irene" scene has some content down to 8hz, if I remember right. Around 0:12 : [PSA: language at 0:26] I tripped a breaker that was feeding my sub amp when I tried cranking that up. I agree that you can feel the real low stuff, but coverage down to 15hz should cover 99% of stuff. |
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Post by jmilton on May 5, 2014 13:16:25 GMT -5
. If you can't hear 16 hz, how does one record it? Humans can't hear it, but that doesn't mean it doesn't exist. The average human can hear sounds between 20Hz and 20kHz (age dependent of course) but sounds exist outside that range. Just like light, we see a limited amount of the available bandwidth of light, but IR we can't see, but there's obviously equipment that can detect it. I never denied it exists. If it is inaudible, how can you record it and present it on a CD. I had a tone generator that went down to 18hz, I felt it but did not hear it on an Earthquake sub woofer. The cone was definitely moving vigorously....but a recording device must have a sonic signature to record. |
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Post by Keith M on May 5, 2014 14:03:33 GMT -5
A sound wave moves through the air and vibrates the mechanism in the microphone and that's how it's recorded. Why would a microphone be limited to human hearing? There will be some limitations in the equipment, it may not go down to 1Hz, and it may not go up into the 100kHz range, but it can be designed to surpass our hearing. And some say that harmonics that fall outside of the range of human hearing affect the sound, hence the importance of going beyond 16/44 when recording, so obviously the equipment can record more than we can hear.
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Post by garbulky on May 5, 2014 14:51:13 GMT -5
Humans can't hear it, but that doesn't mean it doesn't exist. The average human can hear sounds between 20Hz and 20kHz (age dependent of course) but sounds exist outside that range. Just like light, we see a limited amount of the available bandwidth of light, but IR we can't see, but there's obviously equipment that can detect it. I never denied it exists. If it is inaudible, how can you record it and present it on a CD. I had a tone generator that went down to 18hz, I felt it but did not hear it on an Earthquake sub woofer. The cone was definitely moving vigorously....but a recording device must have a sonic signature to record. I don't quite understand the question jmilton. Are you asking how do we know that we recorded a 16 hz sound? Or how is it possible for a microphone to record a 16 hz sound? Or how can one produce a 16 hz sound in real life and know that we were actually doing so? |
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Post by jmilton on May 5, 2014 15:00:00 GMT -5
I never denied it exists. If it is inaudible, how can you record it and present it on a CD. I had a tone generator that went down to 18hz, I felt it but did not hear it on an Earthquake sub woofer. The cone was definitely moving vigorously....but a recording device must have a sonic signature to record. I don't quite understand the question jmilton. Are you asking how do we know that we recorded a 16 hz sound? Or how is it possible for a microphone to record a 16 hz sound? Or how can one produce a 16 hz sound in real life and know that we were actually doing so? I guess YES to all the above, but specifically...if it makes no audible sound, how can a mic pick it up and record it. Why would you attempt to record it if no one hears it. Most sub woofers couldn't produce it even if the sub sonic info could be put on a CD. I dont' know...just musing. Like Curly said, "I tried to think...but nothing happened!" |
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Post by monkumonku on May 5, 2014 15:05:29 GMT -5
I don't quite understand the question jmilton. Are you asking how do we know that we recorded a 16 hz sound? Or how is it possible for a microphone to record a 16 hz sound? Or how can one produce a 16 hz sound in real life and know that we were actually doing so? I guess YES to all the above, but specifically...if it makes no audible sound, how can a mic pick it up and record it. Why would you attempt to record it if no one hears it. Most sub woofers couldn't produce it even if the sub sonic info could be put on a CD. I dont' know...just musing. Like Curly said, "I tried to think...but nothing happened!" But while it may be inaudible to our ears, that doesn't mean it is inaudible or can't be captured by a microphone, does it? That would be true of frequencies at either extreme, I would think. |
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KeithL
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Post by KeithL on May 5, 2014 15:12:22 GMT -5
I'll admit to being a little perplexed as well.... whether we can record something has very little to do with whether we can hear it or not. ("Sound" is simply a word we use to describe vibrations that we can hear - but audio recording equipment doesn't care whether you can hear them or not). Most digital recording equipment goes down to a few Hz, and so will record and play back everything from earthquake rumbles to the warp in a record quite easily. If anything, the only relationship between audibility and "recordability" might be that, before sound effects became popular, engineers generally didn't bother to record things that were inaudible - and, in fact, often filtered them out to prevent them from "bothering" certain equipment (like records) that are somewhat sensitive to inaudibly low frequencies. I never denied it exists. If it is inaudible, how can you record it and present it on a CD. I had a tone generator that went down to 18hz, I felt it but did not hear it on an Earthquake sub woofer. The cone was definitely moving vigorously....but a recording device must have a sonic signature to record. I don't quite understand the question jmilton. Are you asking how do we know that we recorded a 16 hz sound? Or how is it possible for a microphone to record a 16 hz sound? Or how can one produce a 16 hz sound in real life and know that we were actually doing so? |
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Some days I speak gibberish but other times I speak Gibbon-ish. 
