Burst Test Files for Subwoofers - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 01-22-2020, 07:58 AM - Thread Starter
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Burst Test Files for Subwoofers

I just finished creating a set of burst test files for subwoofers. Each file has a 6.5 cycle shaped tone burst, (0.5-0.5*cos(2*pi*f*t/6.5))*sin(2*pi*f*t).
The frequencies the bursts span are 16Hz - 256Hz in 1/6th octave steps.
Each file is 1.00 seconds long with a single 6.5 cycle burst at the beginning.
If somebody can host the files I would be glad to send the full set of 25.

Thes files should be good for exploring the energy storage in your subwoofers and room.
Smeared bursts would indicate the level of energy storage and reflections in the subd and room.
Just play them on your sub and record the sound. Then open a waveform viewer.
I just play the file on repeat and use the Omnimic oscilliscope to watch as I change volume and mic location.

Edit: I used a Linkwitz web page to guide me for creating these files:
http://www.linkwitzlab.com/Ping_tests/Test_signal.htm

The file format is mono 192k, 32bit *.wav
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Last edited by artsci2; 01-22-2020 at 09:03 AM.
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post #2 of 4 Old 01-22-2020, 08:27 AM
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why up to 256hz? That could damage a big 18-21-24's voice coil.

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post #3 of 4 Old 01-22-2020, 09:17 AM - Thread Starter
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Quote:
Originally Posted by trilkb View Post
why up to 256hz? That could damage a big 18-21-24's voice coil.
Any power level and duration that doesn't damage the sub at frequencies below 125Hz will also not damage them above 125Hz.
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post #4 of 4 Old 01-22-2020, 09:25 AM
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Quote:
Originally Posted by artsci2 View Post
Any power level and duration that doesn't damage the sub at frequencies below 125Hz will also not damage them above 125Hz.


Not true, many of the high-displacement drivers count on higher excursion to move air for voice coil cooling. Higher frequencies at high power can cook the coil.

I doubt its an issue with these quick bursts though.

Chris
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