I never cease to be amazed
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Tom, what does the military do with a subwoofer, or is it classified and if you tell me you will have to kill me
Tom, what does the military do with a subwoofer, or is it classified and if you tell me you will have to kill me
It's a Afghan cave blaster, the military's secret weapon to do in Osama.
Tom (Danley): When I watched the video on your ginormous sub, I was reminded of some photos I took at CES a number of years ago on car audio.
Check these out:
By the way, are you not near Atlanta somewhere??
Check these out:
By the way, are you not near Atlanta somewhere??
Steve asks
“what does the military do with a subwoofer, or is it classified and if you tell me you will have to kill me?”
I have to say this is the least satisfying part of the whole thing.
I have been involved designing two different systems for this (I think the same) “military task”.
The first was using the Servodrive woofers with passive radiators at my old job and then this one which uses conventional drivers and a giant Tapped horn.
In the video, your actually looking into the mouth of the horn, the rear of the drivers are at the “small end” which folds back on itself internally.
In all of this, NO ONE was ever able to explain even to me the guy who designed them what it was for.
Now, there are a few “clues”, like it has to survive in a hot dusty place, it has to be tow-able by a 2.5 ton truck or Humvee so one might guess it’s not for use in Minnesota.
One of my first thoughts given the events at the time was like RogerD is thinking, that perhaps it might be some kind of “toilet plunger” for caves or psychological warfare, maybe playing “car stereo bass music” days on end.
Ultimately, given the strict requirement on the distortion, SPL and main operating frequency (a narrow band), a more reasonable guess would be some kind of sound cancellation.
You don’t need low distortion for essentially anything else I can think of.
That leaves me no closer to any real idea what it’s for.
Audioguy, that is the most drivers I have ever seen in a car yikes but that fancy heated aluminum bench seat down the center is mighty fine.
Yes, the company is over in Gainesville Ga, I go back and forth between here (near Chicago where I grew up) and the shop.
Hey if you’re interested in hearing something different, call and ask for Mike or Jeff and arrange a nickel tour and hear some speakers. If you go, bring some CD’s /DVD’s, Mike has a huge library of good stuff but nothing beats things you are familiar with.
Best,
Tom Danley
“what does the military do with a subwoofer, or is it classified and if you tell me you will have to kill me?”
I have to say this is the least satisfying part of the whole thing.
I have been involved designing two different systems for this (I think the same) “military task”.
The first was using the Servodrive woofers with passive radiators at my old job and then this one which uses conventional drivers and a giant Tapped horn.
In the video, your actually looking into the mouth of the horn, the rear of the drivers are at the “small end” which folds back on itself internally.
In all of this, NO ONE was ever able to explain even to me the guy who designed them what it was for.
Now, there are a few “clues”, like it has to survive in a hot dusty place, it has to be tow-able by a 2.5 ton truck or Humvee so one might guess it’s not for use in Minnesota.
One of my first thoughts given the events at the time was like RogerD is thinking, that perhaps it might be some kind of “toilet plunger” for caves or psychological warfare, maybe playing “car stereo bass music” days on end.
Ultimately, given the strict requirement on the distortion, SPL and main operating frequency (a narrow band), a more reasonable guess would be some kind of sound cancellation.
You don’t need low distortion for essentially anything else I can think of.
That leaves me no closer to any real idea what it’s for.
Audioguy, that is the most drivers I have ever seen in a car yikes but that fancy heated aluminum bench seat down the center is mighty fine.
Yes, the company is over in Gainesville Ga, I go back and forth between here (near Chicago where I grew up) and the shop.
Hey if you’re interested in hearing something different, call and ask for Mike or Jeff and arrange a nickel tour and hear some speakers. If you go, bring some CD’s /DVD’s, Mike has a huge library of good stuff but nothing beats things you are familiar with.
Best,
Tom Danley
Talking of sound, and military, and loud, you would be hard pushed to go past the Hyperspike HS-60 AHD -- would 182dB at 1 metre equivalent be loud enough for you? Don't think it's been mentioned here before ...
Frank
Frank
That is loud, but loud is not that hard.
Here is a data sheet for what appears to be the main product, note the frequency response.
http://www.ultra-hyperspike.com/ima.../HyperSpike_HS-24_Acoustic_Hailing_Device.pdf
Here is a camcorder demo of the unit at a distance of 200 yards, pretty cool for its intended purpose.
http://www.youtube.com/watch?v=ZD-t2n4yPQ8
Now, what if you wanted to produce a similar level but with full range music instead of only upper voice range, we have a product that will do that except it has a 90 degree wide coverage angle for crowd use.
The JH-90 is used in football stadiums and other “large” and supplies superior sound quality in areas where multiple line arrays would have previously been required.
http://blog.mixonline.com/briefingr...ty-to-brigham-young-university-football-fans/
It may not be clear how this one works from this but it is a single point source like all our other full range systems.
What is hard to do is make a loudspeaker that sounds acceptable even after one generation, microphones do not hear like our ears.
Here is a camcorder demo of a JH-90, also outdoors and as was measured afterward was actually a distance of 700 feet.
http://www.facebook.com/video/video.php?v=1717077460850&oid=126113687424773&comments
The difference in sound is that normal speakers radiate sound in an interference pattern over much of the range.
While our ears and brain automatically “hear around” that, a microphone doesn’t.
When you don’t produce an interference pattern, the sound is different to your ears and a microphone. Here is another camcorder example of some smaller speakers doing the same thing.
I don’t know where this was or who did it but the sonic point comes across I think.
http://www.youtube.com/watch?v=A5aOg4Yp7fg
Without the interference pattern, it is also harder to hear the depth location of the speaker when in a living room, that (program depending) can produce a much more real stereo image because your ears don’t hear the physical depth location of the source anymore, just the signal.
Speaking of loud, in the old days I used to design transducers for high intensity sound. Some of these were used for Acoustic levitation (using sound to support an object without contact) and eventually flown on two shuttle flights in container less processing experiments.
The picture below is a system of six sound sources which are positioning the glowing sample being levitated. The sample is being heated by a large laser who’s output is split in two so it heats both sides of the sample. The sound sources are the things with the patch of acoustic foam on their faces and the set of six running hard can produce >175dB @ 22KHz. While that may not sound like it’s that loud, it is enough energy to instantly light a cigarette with acoustic friction or give you a burn if you place two fingers in the sound field with a gap between your fingers.
http://www.sciencemag.org/content/287/5455.cover-expansion
Here is how they work;
http://www.google.com/patents/about?id=74Q7AAAAEBAJ&dq=tom+danley
http://www.google.com/patents?id=ccovAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
Anyway, that was fun but I have always loved sound and loudspeakers so I wouldn’t go back to that and besides all this time later, NASA is still scaling down due to the Government need to fight fires they set instead of investing in the future.
Best,
Tom Danley
Here is a data sheet for what appears to be the main product, note the frequency response.
http://www.ultra-hyperspike.com/ima.../HyperSpike_HS-24_Acoustic_Hailing_Device.pdf
Here is a camcorder demo of the unit at a distance of 200 yards, pretty cool for its intended purpose.
http://www.youtube.com/watch?v=ZD-t2n4yPQ8
Now, what if you wanted to produce a similar level but with full range music instead of only upper voice range, we have a product that will do that except it has a 90 degree wide coverage angle for crowd use.
The JH-90 is used in football stadiums and other “large” and supplies superior sound quality in areas where multiple line arrays would have previously been required.
http://blog.mixonline.com/briefingr...ty-to-brigham-young-university-football-fans/
It may not be clear how this one works from this but it is a single point source like all our other full range systems.
What is hard to do is make a loudspeaker that sounds acceptable even after one generation, microphones do not hear like our ears.
Here is a camcorder demo of a JH-90, also outdoors and as was measured afterward was actually a distance of 700 feet.
http://www.facebook.com/video/video.php?v=1717077460850&oid=126113687424773&comments
The difference in sound is that normal speakers radiate sound in an interference pattern over much of the range.
While our ears and brain automatically “hear around” that, a microphone doesn’t.
When you don’t produce an interference pattern, the sound is different to your ears and a microphone. Here is another camcorder example of some smaller speakers doing the same thing.
I don’t know where this was or who did it but the sonic point comes across I think.
http://www.youtube.com/watch?v=A5aOg4Yp7fg
Without the interference pattern, it is also harder to hear the depth location of the speaker when in a living room, that (program depending) can produce a much more real stereo image because your ears don’t hear the physical depth location of the source anymore, just the signal.
Speaking of loud, in the old days I used to design transducers for high intensity sound. Some of these were used for Acoustic levitation (using sound to support an object without contact) and eventually flown on two shuttle flights in container less processing experiments.
The picture below is a system of six sound sources which are positioning the glowing sample being levitated. The sample is being heated by a large laser who’s output is split in two so it heats both sides of the sample. The sound sources are the things with the patch of acoustic foam on their faces and the set of six running hard can produce >175dB @ 22KHz. While that may not sound like it’s that loud, it is enough energy to instantly light a cigarette with acoustic friction or give you a burn if you place two fingers in the sound field with a gap between your fingers.
http://www.sciencemag.org/content/287/5455.cover-expansion
Here is how they work;
http://www.google.com/patents/about?id=74Q7AAAAEBAJ&dq=tom+danley
http://www.google.com/patents?id=ccovAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false
Anyway, that was fun but I have always loved sound and loudspeakers so I wouldn’t go back to that and besides all this time later, NASA is still scaling down due to the Government need to fight fires they set instead of investing in the future.
Best,
Tom Danley
I could find no photos of finished units either.
Item number: 310308657408
TYMPANI TPS-15 15" SUBWOOFER SPEAKER
http://cgi.ebay.com/TYMPANI-TPS-15-...08?pt=Speakers_Subwoofers&hash=item483fd65900
Item number: 310308657408
TYMPANI TPS-15 15" SUBWOOFER SPEAKER
http://cgi.ebay.com/TYMPANI-TPS-15-...08?pt=Speakers_Subwoofers&hash=item483fd65900
Actually, if you think about it...those days are here even more than before! Thanks to these products being bought by the uber $1M+ system owners, you can buy the Velodyne References for 25-50 cents on the dollar. I say good for many of us who want "reference" or "reasonable reference" but prefer not to pay the premium. i have heard a $750K system as posted elsewhere here in Hong Kong...all Tidal, all ARgento Master Reference, Tripoint everything, Vekian source...you name it. i was duly impressed, but i will say i get darn close at home for a whole lot less, and i am focusing on a couple key upgrades which i think will get me within a hair's breadth of being toe to toe...and that is thanks to the fact that i have been able to buy my equipment s/hand from those who have ever-sought the "newer better" thing. For example, i bought my Zanden DAC for a fraction of original price after someone traded it in because he wanted SACD. OK...sold! So i say, let those $150K uber products roll in!!!
SOUND SYSTEM BASS SHREDS PHONE BOOK! - 4 18" Woofers!
http://www.youtube.com/watch?v=K3FqG7yXEUs&feature=player_embedded#at=183
<iframe title="YouTube video player" width="640" height="390" src="http://www.youtube.com/embed/K3FqG7yXEUs" frameborder="0" allowfullscreen></iframe>
http://www.youtube.com/watch?v=K3FqG7yXEUs&feature=player_embedded#at=183
<iframe title="YouTube video player" width="640" height="390" src="http://www.youtube.com/embed/K3FqG7yXEUs" frameborder="0" allowfullscreen></iframe>
I agree Tim. It sounds like he just turns it up until the system is distorting really bad and the woofers are flapping uncontrollably. Either that or the sound is so loud it is just fouling out the microphone that is recording the sound.
In can just imagine what noise that loud is doing to the guy's ears. So, it's no wonder that he has to go louder and louder. I just watched this with my 8-year old, and she said, "Daddy, the car sounds like it is farting."
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