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169db = heart stop?
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<blockquote data-quote="erikvw" data-source="post: 157654" data-attributes="member: 547050"><p>As far as creating enough physical pressure to literally press against the heart (a la a car parked on your chest) I do not believe it is possible considering that all of the flesh in your body (not counting bone) is basically the same density and therefore has the same harmonic so this wave would merely push your entire body. For this to work you would have to be pinned against something or be "chased" by the source.</p><p></p><p>I'm sure most here know this but db is a physical force measurement of "spl" sound pressure level. And FYI every 10db is a percieved doubling of sound not 3. Think about it, most receivers start around -70 db and go up from there, without doing the math, that's an INSANE volume range (~2^23rd) at 3db per double (at 10db it's 128 times louder at full volume). And standing next to a commercial aircraft on takeoff is about 145db, loudest human belch on record is about 125 I believe.</p><p></p><p>Radio waves, which can readily kill you (stick your head in a microwave), only affect those things which have the same molecular harmonic as the wave. Water, what our bodies are almost entirely made of (not sure but I know it's &gt; 70%) has a harmonic of about 21 Ghz. This is approx the spectrum microwave ovens work in and the reason why a microwave oven will not heat anything which doesn't contain moisture.</p><p></p><p>AC current from your wall operates at 60hz, which is the average human heartbeat (60 bpm) and is also why the wall socket in your house is really unhealthy to lick. Your heart beats because of electrical impulses from the brain coming about 1 second apart, the same as the wave from the wall, I think you get the point.</p><p></p><p>Mind you I don't have enough knowledge to really back this up but here goes. Since the resonance of the heart is a measure of the tone it produces while beating (7hz) then the tone of the incoming sound would not affect it in any way outside of vibrating the crap out of it like any other substance. I don't think freq can kill you and as I said earlier, creating enough pressure to kill you with the force of the air would be nearly impossible unless you were extremely close to the source and the wave was extremely well focused which gets really tough to do at low freq. It would be much easier to create an "air cannon" firing bursts of compressed air than it would be to create the same power with sound. Sorry for this being all over the place but I love a good debate.</p><p></p><p>P.S. If you sit in a car at above 150db with no ear protection you're downright certifiable, isn't the whole point of a kick ass system to be able to enjoy the music you're playing and not puncture eardrums? I like it loud don't get me wrong but I also wanna hear it loud tomorrow and the day after.</p></blockquote><p></p>
[QUOTE="erikvw, post: 157654, member: 547050"] As far as creating enough physical pressure to literally press against the heart (a la a car parked on your chest) I do not believe it is possible considering that all of the flesh in your body (not counting bone) is basically the same density and therefore has the same harmonic so this wave would merely push your entire body. For this to work you would have to be pinned against something or be "chased" by the source. I'm sure most here know this but db is a physical force measurement of "spl" sound pressure level. And FYI every 10db is a percieved doubling of sound not 3. Think about it, most receivers start around -70 db and go up from there, without doing the math, that's an INSANE volume range (~2^23rd) at 3db per double (at 10db it's 128 times louder at full volume). And standing next to a commercial aircraft on takeoff is about 145db, loudest human belch on record is about 125 I believe. Radio waves, which can readily kill you (stick your head in a microwave), only affect those things which have the same molecular harmonic as the wave. Water, what our bodies are almost entirely made of (not sure but I know it's > 70%) has a harmonic of about 21 Ghz. This is approx the spectrum microwave ovens work in and the reason why a microwave oven will not heat anything which doesn't contain moisture. AC current from your wall operates at 60hz, which is the average human heartbeat (60 bpm) and is also why the wall socket in your house is really unhealthy to lick. Your heart beats because of electrical impulses from the brain coming about 1 second apart, the same as the wave from the wall, I think you get the point. Mind you I don't have enough knowledge to really back this up but here goes. Since the resonance of the heart is a measure of the tone it produces while beating (7hz) then the tone of the incoming sound would not affect it in any way outside of vibrating the crap out of it like any other substance. I don't think freq can kill you and as I said earlier, creating enough pressure to kill you with the force of the air would be nearly impossible unless you were extremely close to the source and the wave was extremely well focused which gets really tough to do at low freq. It would be much easier to create an "air cannon" firing bursts of compressed air than it would be to create the same power with sound. Sorry for this being all over the place but I love a good debate. P.S. If you sit in a car at above 150db with no ear protection you're downright certifiable, isn't the whole point of a kick ass system to be able to enjoy the music you're playing and not puncture eardrums? I like it loud don't get me wrong but I also wanna hear it loud tomorrow and the day after. [/QUOTE]
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169db = heart stop?
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