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  #1  
Old 09-11-2007, 01:29 PM
janbo janbo is offline
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Default How to create a sine or other waveform in the 5Hz-20Hz range

I am new to Pro Tools LE and could use your help to determine how to create and record waveforms in the five to twenty (5-20) hertz range for output to a tactile transducer. The transducer I am using is the ButtKicker LFE, made by the Guitammer company. It has a frequency response of 5-200 Hz. The QSC amplifier I am using to drive the LFE has its low frequency filter set to off.

if you are interested, here is some additional info on the ButtKicker LFE:
http://www.thebuttkicker.com/downloa...User_Guide.pdf

Thanks for your help!

MacBook Pro, Mac OS X (10.4.9), digi002 rack, Pro Tools LE 7.3, Mackie HUI, JP8K, dynaudio monitors, LFE xducers
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Old 09-11-2007, 03:20 PM
Slim Shady Slim Shady is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz range

Try the Signal Generator plug-in.
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Old 09-11-2007, 05:00 PM
janbo janbo is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz

I tried using the signal generator without success. The signal generator's lowest frequency is 20 Hz. I need to create signals/waveforms below 20 Hz in the range of 5-20 Hz.

Thanks for the suggestion.
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Old 09-11-2007, 05:09 PM
Rail Jon Rogut Rail Jon Rogut is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz

Why? Most converters brick wall below 20Hz.

Rail
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Old 09-11-2007, 05:18 PM
Craig F Craig F is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz

Rail is correct but if you must try it, make the 20Hz tone then use Time Shift (it's free from Digi) to pitch it down lower
or buy the TMH test disks from Hollywood Edge everything you need to break a system on a 4 disk set.
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Thank you,

Craig
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  #6  
Old 09-11-2007, 09:10 PM
janbo janbo is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz

I want to see how various low frequencies feel, beginning with the Schumann Resonance or "earth-ionosphere cavity resonance" in the range of 7.55-7.95 Hz.

If you are interested, there is some data regarding the measurements of this resonance from the Northern California Earthquake Data Center, a joint project of the University of California Berkeley Seismological Laboratory and the USGS.

http://www.ncedc.org/ncedc/em.intro.html
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Old 09-12-2007, 06:00 AM
chris110000100101001 chris110000100101001 is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz range

Try Audiotest
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Old 09-12-2007, 07:42 AM
Neale Neale is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz r

"Feel" is the right term... you certainly aren't going to HEAR 7Hz. You can't hear it, I wonder how well your floor/wall is going to represent it (what's the natural resonating frequency of the floor? did you tune it?), and unless your room is pretty big, the waveform isn't going to form fully. There's math out there on how to calculate the length of the wave, I just can't remember the formula... see if your room is actually going to accommodate it. Someone standing outside may, but then again, it'll take an awful lot of power to feel it in the great outdoors.
So if you're going to "feel" it, and your transducer is actually producing a perfect 7.x Hz sine wave, are you feeling that wave unaltered in/by the room? The resonance of the walls/floor instead of the pressurized air? Is your room a sealed box, bandpass, etc., which will affect the ability of the system to pressurize the air properly to produce this LOOONGG wave? Harmonics? Nodes? Standing waves?
Lots of other physical issues to deal with beyond just generating the wave. Never mind that a plug-in may or may not generate the pure tone, your d/a may not put out a true sine wave signal to the power amp...
Giraffes make subsonic noise to talk to each other, but you'll never see it or feel it... unless you use a measurement mic and some software.
Obscure fact of the day.
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Old 09-12-2007, 10:04 AM
Rail Jon Rogut Rail Jon Rogut is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz r

... and which D to A do you own which can reproduce anything below 20 Hz?

Rail
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  #10  
Old 09-12-2007, 11:29 AM
Neale Neale is offline
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Default Re: How to create a sine or other waveform in the 5Hz-20Hz r

Nah, I'm just saying... Assuming you've read that far down the post, and you think you can get over all the other limitations, no one mentioned the room aspects or any other physical aspects. So it's a lot more than just generating the sound file from the "Signal Generator" or whatever other plug-in.
What you MIGHT be able to do is get a record player in good shape with a good needle and a test record that has a tonearm "resonance" test. Some of these test records (one of them Shure test LPs for the V15 cartridges that pop up on eBay from time to time, for example) go to subsonic frequencies (watch your tone-arm jiggle at it's native resonance!) which you may be able to play back, assuming your phono preamp is faithful (and that your needle can track it), by using bass management and running the subsonic stuff to this "transducer". Only thing is it's a sweep, so you may not ever know what Hz it is specifically that you're feeling.
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