Dick Posted July 21, 2015 Share Posted July 21, 2015 old school air raid/ PO siren then btw 127 is mb limit for a reason Nope, it is extremely modern, latest tech. )I'm aware of the reason for 127dB but as I have no neighbours and can view the site on activation and therefore turn it off remotely I don't need to leave it running if help is on-site. im not sure its 127/8 but know hearing damage occurs below that "10dB Absolute silence 13dB Incandescent light bulb hum 15dB Pin drop from a height of 1 centimetre heard at a distance of 1 meter 30dB Totally quiet night time in desert 40dB Whispering 60dB Normal conversation 85dB Beginning of hearing damage range, earplugs should be worn 100dB Normal average car or house stereo at maximum volume 110dB Car stereo with two 6 x 9” speakers and 100 watts 116dB Human body begins to perceive vibration from low frequencies 120dB Front row at a rock concert 125dB Drums, at the moment of striking 127dB Tinnitus (ringing in the ears) begins. Permanent hearing loss 128dB Loudest human scream 130dB Typical professional DJ system 130dB Marching band of 200 members 132dB Eardrum vibration noticeable 133dB Gunshot 135dB “Very loud” street car stereo. Bass only 140dB Threshold of pain, all frequencies 140dB Hearing protection required (definite long term damage) 140dB human throat and vocal cord resonance occurs 141dB Nausea felt after a few minutes 144dB Nose itches due to hair vibrations 145dB Vision blurs due to eyeball vibration 147dB Formula 1 race car full throttle drive bye 149dB Human lungs and breathing begins vibrating to the sound 150dB Loud rock concert, at speakers 150dB Sensation of being compressed as if underwater 152dB Vibration is painful and felt in joints 153dB Throat vibrating so hard it is impossible to swallow 154dB Compression will burst child’s balloon 155dB Experience cooling from excited air movement, up to 15 degree C perceived cooling 158dB Inside of a rock concert speaker bin with 5000 watts power 160dB Flashlight exhibits electromagnetic pulsing (dimming during tone) 163dB NHRA Top Fuel Dragsters- 5000 to 7000 horsepower 163dB Possible glass breaking level 164dB Internal sound pressure of a large jet turbine 165dB Jet airplane, Example: Boeing 727, at take off 170.75dB = 1 pound per square inch 172dB Fog is created, depending on the temperature, dew point and humidity 174dB Air begins to heat up due to compression 175dB Quarter dynamite stick, very close pressure may exceed 210 db. 177dB = 2 pound per square inch 180dB 1 pound TNT at 15 feet 181.6dB Loudest extreme SPL car in the world 183dB = 6 PSI. On large scale would result in total destruction of all structures, and particle velocity of 180 miles per hour. 191dB 1 lb. bomb or grenade at blast epicentre 193.979dB 1 bar pressure, 14.504 pounds per square inch 195dB Human eardrums rupture 202dB Death from sound wave (shock) alone. 210.6dB Earthquake Richter scale equivalent 2.0 213dB Sonic boom generates approximately 1.2 gigawatts power equivalent 215dB Space shuttle launches exhaust, approximately 3 miles per second 215dB Battleship New Jersey firing all 9 sixteen inch guns 216dB Equivalent to a piston engine cylinder with a 9 to 1 compression ratio 235.19dB Earthquake Richter 5.0 or 31,624 tons of TNT 243dB Largest non-nuclear explosion ever, 1947 explosion in Nazi u-boat pens used 7100 tons of explosive 248dB Atomic bombs dropped on Hiroshima and Nagasaki, Japan, August 6th & 9th, 1945. Total disintegration of 16 square miles, wind was around 300 miles per hour, destroyed 28” thick concrete walls at 1 mile distance. Leaving a crater 633 feet wide and 80 feet deep. ..equals also the sound (~shock) of the wind inside the core of a fully fledged tornado (a relatively powerful one, destroying everything on its way, lifting cows in the air and moving cars at a distance), devouringone3 286dB Mt. Saint Helens volcanic eruption 310dB Krakatau volcanic eruption 1883. Cracked one foot thick concrete at 300 miles, created a 3000 foot tidal wave, and heard 3100 miles away, sound pressure caused barometers to fluctuate wildly at 100 miles indicating levels of 190db at that distance from blast site. Rocks thrown to a height of 34 miles." Quote Link to comment Share on other sites More sharing options...
james.wilson Posted July 21, 2015 Share Posted July 21, 2015 well that showed me, good info pompeii should of had sound bombs. Quote securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
charlie6 Posted July 22, 2015 Share Posted July 22, 2015 "...30dB Totally quiet night time in desert..." Loved the list but this one is dependant on which desert you happen to be in at night... or does it refer to a particular portion of 'night' when not a lizard is stirring !! Quote Link to comment Share on other sites More sharing options...
CarlS Posted July 23, 2015 Author Share Posted July 23, 2015 Wow Dick! Thats a lot of info! LOL Quote Link to comment Share on other sites More sharing options...
Dick Posted July 23, 2015 Share Posted July 23, 2015 Wow Dick! Thats a lot of info! LOL It's extremely popular with women at parties too, Carl, especially when recited word for word. Quote Link to comment Share on other sites More sharing options...
charlie6 Posted July 23, 2015 Share Posted July 23, 2015 Well it's certainly a new 'chat up' line Dick, better than 'do you come here often'. Quote Link to comment Share on other sites More sharing options...
CarlS Posted July 24, 2015 Author Share Posted July 24, 2015 ^^^ :roflmao: Quote Link to comment Share on other sites More sharing options...
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