Brown note: Busted

Cal Weldon · 3rd March 2005, 02:41 AM

Just watched the demo on Mythbusters on Discovery channel.
Adam's all full of shivick and they let 'im have it.
Holy dB Batman! 5Hz, 7Hz, 9Hz, etc.
Nothing flying out of Adam.
Anyone else see it?
Quite the speaker set up.

Cal

BassAwdyO · 3rd March 2005, 02:50 AM

I didnt see that episode.... MAN that really makes me mad. I love that show and watch it almost every week. Hopefully they will have a rerun.

they say the brown note myth is busted??? What sound intensity did they use?!?! I really want to see that episode!

xstephanx · 3rd March 2005, 02:50 AM

didnt get to watch, but didnt they use a bunch of pro woofers OUTSIDE? youre not going to get that much LF output
they shoudl have done it in a closed off cement basement. or hell, gone all the way and used a wall of tumults!

It also would have been easier to do in a car...

454Casull · 3rd March 2005, 03:00 AM

Of course they measured SPL levels.

BassAwdyO · 3rd March 2005, 03:11 AM

They measured SPL.... and what levels did they use?

454Casull · 3rd March 2005, 04:08 AM

http://www.meyersound.com.au/brownnote.shtm

BassAwdyO · 3rd March 2005, 04:58 AM

they said 120db @9hz with 153db peak and narrow band noise...

That sounds to me like they could only get up to 120db @9hz....

If that were the case.... I dont believe that myth is busted. I read somewhere(I believe a report by nasa) that the intensity of an 8hz tone had to be over 140db for such browness to occur.

What kind of clowns run that show? they needed to build a solid chamber and line the walls with subwoofers. That way they get cabin gain, and it wouldnt require half as many speakers to get 100 times the output power.

It seems to me that they were just trying to prove that its not going to happen at a rock concert.

Cal Weldon · 3rd March 2005, 02:41 PM

Well I still think it's busted.
120 dB at 5, 7 or even 9 Hz is not only difficult to achieve, I can't see a situation where an evil force, trying to cause this might be able to do better than that in a real life situation. Unless they used something other than audio equipment to generate the wave.
They were able to get over 150 with a 20 Hz signal and Adams voice was vibrating, not to mention his vision was blurry.

Was it ever something to see the woofs at 5Hz. That was quite the excursion, but the people were still able to talk over the "sound"

If you look closely at the pics, you can see the Depends that Adam wore over his jeans. In fact all of them were out there in that parking lot with the adult diapers on.

Cal

BassAwdyO · 3rd March 2005, 05:18 PM

Yeah audio equipment wont do that kind of insane SPL except in car environmet. I wouldnt want anyone shatting themeself in my car, so I'll try to stay away from confirming that myth.

I've heard of many people who have gotten sick from infrasound (actually happened once in my house) and have thrown up. But all in all, I've never heard of anyone who actually lost control of their bowels.

Most likely the mythbusters are right and the myth is busted.... but someone might prove them wrong yet!

Cal Weldon · 3rd March 2005, 05:27 PM

I would suppose that given enough SPL, you would lose control. I think it would happen just before dismemberment. I'm just not sure that would happen from audio equipment.

Let's hope no one tries to prove it wrong.

Cal

3rd March 2005, 02:41 AM	#1
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Brown note: Busted Just watched the demo on Mythbusters on Discovery channel. Adam's all full of shivick and they let 'im have it. Holy dB Batman! 5Hz, 7Hz, 9Hz, etc. Nothing flying out of Adam. Anyone else see it? Quite the speaker set up. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

3rd March 2005, 02:50 AM	#2
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	I didnt see that episode.... MAN that really makes me mad. I love that show and watch it almost every week. Hopefully they will have a rerun. they say the brown note myth is busted??? What sound intensity did they use?!?! I really want to see that episode! __________________ The golden rule of DIY: Build nice, or build twice!

3rd March 2005, 02:50 AM	#3
xstephanx diyAudio Member Join Date: Oct 2004 Location: t-dot, canada	didnt get to watch, but didnt they use a bunch of pro woofers OUTSIDE? youre not going to get that much LF output they shoudl have done it in a closed off cement basement. or hell, gone all the way and used a wall of tumults! It also would have been easier to do in a car... __________________ CREEEAAAAAMMMMM CHEEEEEESSSSSSEEEEEEE!!!!! EEEEESSSSEEEEEEHC MMMMMAAAAAEEEERRCCC!!!!

3rd March 2005, 03:11 AM	#5
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	They measured SPL.... and what levels did they use? __________________ The golden rule of DIY: Build nice, or build twice!

3rd March 2005, 04:58 AM	#7
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	they said 120db @9hz with 153db peak and narrow band noise... That sounds to me like they could only get up to 120db @9hz.... If that were the case.... I dont believe that myth is busted. I read somewhere(I believe a report by nasa) that the intensity of an 8hz tone had to be over 140db for such browness to occur. What kind of clowns run that show? they needed to build a solid chamber and line the walls with subwoofers. That way they get cabin gain, and it wouldnt require half as many speakers to get 100 times the output power. It seems to me that they were just trying to prove that its not going to happen at a rock concert. __________________ The golden rule of DIY: Build nice, or build twice!


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3rd March 2005, 03:00 AM	#4
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Of course they measured SPL levels.

3rd March 2005, 04:08 AM	#6
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	http://www.meyersound.com.au/brownnote.shtm

3rd March 2005, 02:41 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Well I still think it's busted. 120 dB at 5, 7 or even 9 Hz is not only difficult to achieve, I can't see a situation where an evil force, trying to cause this might be able to do better than that in a real life situation. Unless they used something other than audio equipment to generate the wave. They were able to get over 150 with a 20 Hz signal and Adams voice was vibrating, not to mention his vision was blurry. Was it ever something to see the woofs at 5Hz. That was quite the excursion, but the people were still able to talk over the "sound" If you look closely at the pics, you can see the Depends that Adam wore over his jeans. In fact all of them were out there in that parking lot with the adult diapers on. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

3rd March 2005, 05:18 PM	#9
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	Yeah audio equipment wont do that kind of insane SPL except in car environmet. I wouldnt want anyone shatting themeself in my car, so I'll try to stay away from confirming that myth. I've heard of many people who have gotten sick from infrasound (actually happened once in my house) and have thrown up. But all in all, I've never heard of anyone who actually lost control of their bowels. Most likely the mythbusters are right and the myth is busted.... but someone might prove them wrong yet! __________________ The golden rule of DIY: Build nice, or build twice!

3rd March 2005, 05:27 PM	#10
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I would suppose that given enough SPL, you would lose control. I think it would happen just before dismemberment. I'm just not sure that would happen from audio equipment. Let's hope no one tries to prove it wrong. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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