Are infrasonics worth the potential health problems? - Page 2 - AVS Forum
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post #31 of 47 Old 07-18-2012, 06:01 PM
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No kidding. For some reason, people who take too much LSD believe this crap, even though they are usually smart enough people. I feel this is clearly the case with the author of the first article. That said, the military certainly does use sound as a weapon, and it can be very powerful. The shock wave from a nuclear blast does the most damage and it is basically a giant destructive sound wave.
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I have to give props to the author - the article was an extremely interesting and unsettling read.
The problem is it's complete and utter propaganda. Infrasonic sound bursting through concrete and tank armour? If this was even close to the case then infrasonic "weaponry" and defense would be under heavy military development everywhere today.

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post #32 of 47 Old 07-19-2012, 06:41 AM
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Absolutely, some big line arrays from Wisdom, and some nice Blue Oyster Cult.
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post #33 of 47 Old 07-20-2012, 02:28 PM
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That's one way of getting more cowbell.
A less painful way would be to simply buy a cowbell.
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post #34 of 47 Old 07-24-2012, 11:47 AM
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Not just really deep bass. But I wonder about that really hard chest slamming bass.

But I really love things like this that rattle your ribcage and you get that 'punch in the chest' feeling:

http://www.youtube.com/watch?v=EMfx75vTyHE

Sounds like the building is shaking in that video, and the grilles in front of the drivers are rattling it seems.....

Hard to tell in this video as the mic that he recorded it with sounds a bit distorted, but this seem to drop exceedingly low:
http://www.youtube.com/watch?v=T-h5OxT_wBw
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post #35 of 47 Old 07-25-2012, 12:37 PM
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Chest impact is not at infrasonic, more like the octave around 60-120Hz.
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post #36 of 47 Old 07-25-2012, 02:21 PM
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Quote:
Originally Posted by A9X-308 View Post

Chest impact is not at infrasonic, more like the octave around 60-120Hz.
The bandwidth is even narrower than that, 50-70Hz according to RTAs I've taken at major concerts. One doesn't associate that bandwidth with chest impact at 'normal' listening levels, but at 115dB it's literally breathtaking.

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post #37 of 47 Old 07-26-2012, 10:39 AM
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Quote:
Originally Posted by Bill Fitzmaurice View Post

The bandwidth is even narrower than that, 50-70Hz according to RTAs I've taken at major concerts. One doesn't associate that bandwidth with chest impact at 'normal' listening levels, but at 115dB it's literally breathtaking.


Fortunately, is smack dab right in the operational wheelhouse of such cabinets.

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post #38 of 47 Old 07-31-2012, 06:07 PM
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I have to say, looking around the website more, at least in my humble opinion, I wouldn't put much stock in it. The site seems to be dedicated to fringe science and "new agey" philosophy. While there may be effects of sound on the body we don't yet understand, I wouldn't be basing conclusions on this info.

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post #39 of 47 Old 07-31-2012, 06:36 PM
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As far as infrasonics go, I'm planning on building two 18" LLTs. I'm more worried about the 170 year old German house I'm renting...
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post #40 of 47 Old 08-03-2012, 12:51 PM
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http://usasam.amedd.army.mil/dl/Flight%20Provider%20Refresher/Lesson%203%20Aeromedical%20Physiology/Lesson%203%20part%20F,%20Vibration.pdf
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http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940028995_1994028995.pdf
I wouldn't mind a sonic boom generator in my living room hehe

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post #41 of 47 Old 08-03-2012, 01:10 PM
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Quote:
Originally Posted by Bill Fitzmaurice View Post

The bandwidth is even narrower than that, 50-70Hz according to RTAs I've taken at major concerts. One doesn't associate that bandwidth with chest impact at 'normal' listening levels, but at 115dB it's literally breathtaking.

Exactly where I prefer a nice boost for my home theater listening, and exactly where I always seem to have response problems... Dang :/

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post #42 of 47 Old 08-30-2012, 02:26 AM
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post #43 of 47 Old 08-30-2012, 09:38 AM
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Unfortunately, yes. The one where they try to hit the 'brown note' using an array of pro-audio style cabs with 18" drivers. rolleyes.gif

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post #44 of 47 Old 08-30-2012, 11:08 AM
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Quote:
Originally Posted by Scott Simonian View Post

Unfortunately, yes. The one where they try to hit the 'brown note' using an array of pro-audio style cabs with 18" drivers. rolleyes.gif

Sure, it could've been executed in a somewhat better manner. However, in pro audio speaker mfg., there's few that can compare to John Meyer. They went at it pretty strong, they sealed the vented double 18s. They arrayed (24)1kw powered 18s, claimed they hit 114dB@7hz, 128dB@32hz (not impressive at all compared to what I've measured in my room), then opened the vents and hit 154dB on multi-octave sweeps.

Sure, if they were going after an all out assault of the bottom octaves they could have approached it differently. Hell, Danley offers up a one box sub that hits into the 150+dB range. Infra? ...no. The big mis-step I remember when viewing it was performing the test outdoors, with no boundaries other than the ground for as far as the eye could see. Another big mis-step was not hiring procuring the Matterhorn, and the Danley guys. Meyer is a west coast operation, so I'm guessing that had mucho to do with it.


Thinking, .... that was aired many years ago, and since then there's been a nice push downward in touring PA subs corner freq. These days, experiencing the LF a nicely tuned "A" rig outdoors is a wonderful thing. Especially since the kick drum became the new lead vocal eek.gif

Anyone ever seen any hard measurement numbers associated with the Matterhorn?

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post #45 of 47 Old 08-30-2012, 11:25 AM
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Quote:
Originally Posted by FOH View Post

Another big mis-step was not hiring procuring the Matterhorn, and the Danley guys. Meyer is a west coast operation, so I'm guessing that had mucho to do with it.


Thinking, .... that was aired many years ago, and since then there's been a nice push downward in touring PA subs corner freq. These days, experiencing the LF a nicely tuned "A" rig outdoors is a wonderful thing. Especially since the kick drum became the new lead vocal eek.gif

Anyone ever seen any hard measurement numbers associated with the Matterhorn?

I well remember that episode and laughed at how far they were from the really interesting levels down low. IIRC, that was prior to the Matterhorn being completed, but those 18s just didn't have the excursion to even have a shot.

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post #46 of 47 Old 08-30-2012, 12:20 PM
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Quote:
Originally Posted by Mark Seaton View Post

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Originally Posted by FOH View Post

Another big mis-step was not hiring procuring the Matterhorn, and the Danley guys. Meyer is a west coast operation, so I'm guessing that had mucho to do with it.


Thinking, .... that was aired many years ago, and since then there's been a nice push downward in touring PA subs corner freq. These days, experiencing the LF a nicely tuned "A" rig outdoors is a wonderful thing. Especially since the kick drum became the new lead vocal eek.gif

Anyone ever seen any hard measurement numbers associated with the Matterhorn?

I well remember that episode and laughed at how far they were from the really interesting levels down low. IIRC, that was prior to the Matterhorn being completed, but those 18s just didn't have the excursion to even have a shot.
Ah, perfect! With a whole bunch of SubM HPs and the even bigger monsters in the warehouse, I'll bring the camera and food (and adult diapers?) and we can try replicating the experiment under more ideal circumstances! LOL.

Honestly speaking though, seeing as how you've undoubtedly been exposed to substantial infrasonics, have YOU ever personally gotten sick from it? Some symptoms that could directly be attributed to exposure to single digit Hz?



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post #47 of 47 Old 08-30-2012, 03:23 PM
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Quote:
Originally Posted by djbluemax1 View Post

Some symptoms that could directly be attributed to exposure to single digit Hz?

Yeah, tachycardia, increased respirations, perma-grin ..... certainly nothing detrimental cool.gif

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