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Old 19th November 2008, 06:08 PM   #1
jzagaja is offline jzagaja  Poland
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Default Indirect method of sound creation

Old technology in a new form:

http://www.atcsd.com/site/content/view/34/47/

Its response measured. The only one source is here at diyaudio ;-)
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Old 19th November 2008, 06:19 PM   #2
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The LRAD is more fun, it puts all of its Watts in the audible range
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Old 4th December 2008, 04:27 PM   #3
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The chart has the following axis:

Quote:
FR Magnitude dB re 20µPa/V

I am familiar with 1watt / 1 Meter term

I am familiar with 2.83V / 1 Meter term, (not the same as above if impedance is not 8 ohms)

Not familiar with this term.

What is the norm for this measurement? Should the ideal line be flat, or is it some kind of power measurement where the ideal line should be sloping down?
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Old 4th December 2008, 04:45 PM   #4
jzagaja is offline jzagaja  Poland
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Wikipedia: The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity, it is a dimensionless unit. 20uPa/V is 0dBspl - threshold of hearing.

This measurement is uncalibrated - unknown efficiency. Don't know what can be expected from heterodyne transducer - maybe typical bandpass. Some DSP is probably incorporated.


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Old 4th December 2008, 06:27 PM   #5
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Jzagaja:

Thank you. By DSP do you mean equalization? Because if the plot is not equalized, it would seem that not that much equalization is necessary up to 10kHz-it really "rolls off the table" after that. But that should be more than adequate for PA work.

I also gather that the "column" they talk about is horizontal rather than vertical. Sort of a sound laser from source to point.

I wonder if they have directionality charts which show how quickly the SPL goes down once you leave the area of maximum SPL.
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Old 4th December 2008, 06:47 PM   #6
jzagaja is offline jzagaja  Poland
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I had only 5 minutes and laptop. Now don't have any chance of putting hands on them. Directivity is really extreme - forget about horns. Here you hear almost nothing outside the beam.
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