By burping a system you get a peek of power and lower impedance. By playing a system for a longer than a burp you have voltage loss, and higher impedance raise witch in a sense you loose power. I hope that helps.
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Can bass waves actually hurt you?
- Thread starter Damani311
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By burping a system you get a peek of power and lower impedance. By playing a system for a longer than a burp you have voltage loss, and higher impedance raise witch in a sense you loose power. I hope that helps.
now enuff about caraudio!
Will bass waves hurt you? If its to loud like any thing over 130 db, than YES it will hurt you in many differnent ways.
Will bass waves hurt you? If its to loud like any thing over 130 db, than YES it will hurt you in many differnent ways.
This is due to a completely different cause than measuring SPL (the "P" meaning pressure variations). Blowing into a microphone results in an inertance effect wherein the mass of air striking the diaphragm is decelerated and causes it to respond. Since the airstream breaks up upon hitting the obstacle, it becomes turbulent and the resulting eddies and vortices cause a random, cyclic variation in pressure that one can hear if it's connected to an audio amplifier.
Another comment: "sound" is the linear, small-signal (cyclical) variation in pressure of a medium (air, for example). If the pressure variation exceeds a threshold (I recall it's probably around 170-180 dB) the phenomenon becomes non-linear, and it's into the realm of macrosonics. Explosive devices or things that exceed the speed of sound cause shock waves - and those are among this category. So if you have a microphone and sound level meter that are capable of reading SPL levels of up to 170 dB, and there is no "wind" affecting its measurement (i.e., pure pressure variations), then it could be accurate.
- Mike
I'm willing to give you the benefit of the doubt, but only if you were prepared to engage the subject intelligently and without making personal attacks on the qualifications of the posters you are arguing with.
You don't have to be able to run a 4 minute mile to understand the physics behind it. Your records prove nothing without some explanation as to their measuring methodology, etc, and Bill has enough credentials to give creedence to his arguments, which he backs up with explanations. Insisting and insulting is not enough if you want to convince anyone. This is why you are accused of trolling.
I have 2 stories for you.
1). The closest thing to actual harm from bass waves I ever encountered was at a Circle Jerks show. It was a medium sized club with a nice PA, and the kick drum was so cranked it actually was giving me CPR-pushing so hard on my chest I was having trouble breathing. I actually had to leave.
2). Another nice PA in a small club with 'Earthquake' subs crossed over way down in a 4 way system. (These were used in theatres for the 70's movie to provide the effect of a real quake). Cerwin Vega 18's.
I'm sitting with the house guy, and he says "See those girls at that table in the corner? I predict at least one of them will be going to take a pee in the next 2 minutes", and he reaches over and boosts the last 2 faders on the EQ. Bingo!
Well I've definitely felt ill from the drummer I used to play with. He broke snare heads on a regular basis and even bent the a snare drum rim. He didn't play loud on a regular basis but I've felt a heart-stoppingness before from him. Like a deep bone injury. WEIRD!
Standing near Super Comp dragsters at the starting line for a few races makes you feel like your heart's all messed up. I have heart block and I'm prone to arrhythmia, and although I probably can't die from it, enough of these "wave hits" can make me pass out.
To the question "can they hurt you", the answer is yes, they definitely can (and it's not a question of wether a car can or not generate lethal bass waves). The amount of air being moved by the pressure generated can exert forces that will damage your internal ear and probably other parts (lungs or maybe heart if it syncs off - happens to me).
To the question "can they hurt you", the answer is yes, they definitely can (and it's not a question of wether a car can or not generate lethal bass waves). The amount of air being moved by the pressure generated can exert forces that will damage your internal ear and probably other parts (lungs or maybe heart if it syncs off - happens to me).
YES ABSOLUTELY!
I worked with a doctor from the Army that wrote papers about this. The Military has even studied LF sound as a weapon. It causes a neurological stress and it is called vibroacoustic desease
He had developed a new type of loudspeaker that did not cause pressure waves.
You can read about it at Link Removed
Something to think about.
I worked with a doctor from the Army that wrote papers about this. The Military has even studied LF sound as a weapon. It causes a neurological stress and it is called vibroacoustic desease
He had developed a new type of loudspeaker that did not cause pressure waves.
You can read about it at Link Removed
Something to think about.
Yup. I think Tesla had a invented a sound weapon, his lab eventually was confiscated by the government.
Meh. Do it wideband in a stadium and I'll be impressed. Otherwise the PEC comment stands.
Ultra Low Frequency weapons are already on the battlefield.
Not your father's Ampeg however.
http://www.globalsecurity.org/military/systems/munitions/accoustic.htm
Not your father's Ampeg however.
http://www.globalsecurity.org/military/systems/munitions/accoustic.htm
Try this one. Kicker Warhorse the WX10000.1 10k watts of power!
kicker.com
also you can find yours truly under Team Kicker... see if you can find me.
The image below shows a calculation I made to determine roughly what's going on in an enclosed space subjected to a given wattage of low frequency audio program.
Note that you need many megawatts of power to produce 170 dB in this example, with typical loudspeaker electroacoustic efficiency.
Keep in mind that, if you can reduce the control surface area (boundaries of the "cabin"), the achieved sound level will be higher. However, like power, the surface area of the cabin or room would have to be 1/10th as big in order to achieve a 10 dB increase. Also keep in mind that the speaker cones themselves will react to those high pressure levels and have increasing difficulty compressing and rarefying the air. Note that all of the foregoing (in the attached image file) says nothing about peak power versus continuous power. Momentary peak power levels that are ten to a hundred times the continuous level may be possible.
One could easily induce close to 190 dB SPL in a cavity by using a modulated hydraulic piston in a rigid enclosure such as a steel cylinder or concrete case and then closing it off completely from the surroundings. For example, 0.5 of atmospheric pressure would equal 188 dB. The over- and under-pressures developed could be so great as to rip your body apart. (194 dB is the theoretical value of a perfect vacuum relative to normal atmospheric pressure.) This is probably why I haven't seen anyone volunteer to live inside a combustion chamber of a large diesel engine!
A 1 psi overpressure is sometimes cited as a value capable of damaging or knocking down buildings. This would correspond to 170 dB of sound pressure level at the surfaces (walls, ceilings).
- Mike
Useful References:
http//en.wikipedia.org/wiki/Sound_intensity_level
http//en.wikipedia.org/wiki/Sound_pressure_level
http//www.sengpielaudio.com/TableOfSoundPressureLevels.htm
http//www.sengpielaudio.com/calculator-soundlevel.htm
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