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nyc protests, important, pls boost+++ 

apparently nypd may be bringing sonic cannons out today so just in case:
GET EAR PROTECTION
LRAD decibel levels range from 140 and 150+ dB which is way more than enough to cause permanent damage
i cant stress this enough: BRING EAR PROTECTION AND STAY OUT OF RANGE OF THOSE THINGS

nyc protests, important, pls boost+++ 

sorry to delete and redraft, i wanted to adjust the wording bc i dont know for certain and i dont wanna spread misinfo ><
either way better be prepared n safe than end up with permanent hearing damage
pls stay safe out there >< 💜🖤💜

portland protests, important, pls boost+++ 

UPDATE: ive heard portland may be using LRADs as well
portland folks: be prepared with ear protection !!!
LRADs emit sounds exceeding 140 dB
exposure to sound waves above 90 dB causes permenant damage to the human ear
BRING EAR PROTECTION
STAY SAFE 🖤

in case of LRADs at protests, important, pls boost+++ 

distances from LRAD trucks and their decebel levels/effects
20 meters - 120 dB (pain threshold for humans)
50 meters - 107 dB
200 meters - 95 dB
(threshold for permenant damage after long term exposure begins at 90 dB)
500 meters - 88 dB

sound is created through the use of an array of small electromagnetic drivers that combine to significantly amplify output
the structure of the device helps keep sound waves focussed

in case of LRADs at protests, important, pls boost+++ 

seriously yall take it from your local musician/sound tech
you do NOT fuck around with amplitudes this high
PROTECT YOUR EARS 🖤

in case of LRADs at protests, important, pls boost+++ 

important to note: decibels are a LOGARITHMIC scale
140 dB is NOT ~2x louder than 90 dB, rather it is around 30x LOUDER

if you see LRADs LEAVE THE AREA and always keep some kind of ear protection on you, gas grenades, rubber bullet guns, etc are really loud too !!

STAY SAFE 🖤

in case of LRADs at protests, important, pls boost+++ 

glossy (or even mirrored if possible) posterboards can make decently effective deflectors but they are NOT a substitute for ear protection or leaving

stay far the fuck away from these things if you can

nyc protests, important, pls boost+++ 

@raekh Don't worry, you announced that you were redrafting it so that was pretty clear!

nyc protests, important, pls boost+++ 

@raekh ok what the fuck

nyc protests, important, pls boost+++ 

@raekh (deleted a post i made earlier bc uncorroborated n maybe misinfo but) these things are honestly terrifying. the output arrays are designed to be used for like,,,,, ship-to-coast emergency evacuation stuff, but u know that theyre gonna be using them ten feet from ppl

nyc protests, important, pls boost+++ 

@raekh can you please ref this? I know I sound like a jerk, sorry, but I was already caught in multiple misinformation attempts recently

nyc protests, important, pls boost+++, birdsite link 

@charlag my source is this thread
like i said id rather be uncertain n warn ppl than have folks be unprepared

twitter.com/hermit_hwarang/sta

nyc protests, important, pls boost+++, birdsite link 

@raekh thanks! I still think it's useful to link

nyc protests, important, pls boost+++ 

@raekh FYI - most shooting ear protection will reduce sound by about 31 dB, which will at least take that down to the "tolerable" range and allow you to get to safety.

I recommend bringing low profile ear protection with your kit, along with ballistic eye protection.

in case of LRADs at protests, important, pls boost+++ 

@raekh Honestly with the flashbangs, gas grenades, and shooting in general it's a good idea to bring ear protection to a protest to begin with.

in case of LRADs at protests, important, pls boost+++ 

@raekh flashbulb did a video on it recently: youtube.com/watch?v=3sqIvak-4E

in case of LRADs at protests, important, pls boost+++ 

@raekh @lifning way more than that. Every 10dB increase means 10x the acoustic energy. So a 50db increase means 100,000x the acoustic energy, and up to 100,000x the rate of damage.

in case of LRADs at protests, important, pls boost+++ 

@raekh

LRADS are so absurdly loud their use has been ruled to be excsessive force. Even with ear protection they can cause hearing loss and anxiety so be very careful and run to the side so it has to swivel.

Double up on over ear and in ear plugs. Also try to wear something to stop it from rattling your organs.

re: in case of LRADs at protests, important, pls boost+++ 

@raekh A quick note on dB, it's a logarithmic scale so iirc an increase of 12 dB is twice as loud.

re: in case of LRADs at protests, important, pls boost+++ 

@flowerenby yep !!
i couldnt find a way to get that into these posts without either derailing my point or exceeding the character limit ><

re: in case of LRADs at protests, important, pls boost+++ 

@raekh that's fine, i just thought it would be important for people to get a scale of it. thinking 140 isn't quite double 90 is dangerous, it's over 30x louder.

also good for people to know a general rule for sound (and light) is double the distance to quarter the intensity

re: in case of LRADs at protests, important, pls boost+++ 

@flowerenby do you mind if i use this info for adding to my posts?

re: in case of LRADs at protests, important, pls boost+++ 

@raekh please do, it's why i mentioned it!

re: in case of LRADs at protests, important, pls boost+++ 

@flowerenby aaaa okie just wanted to make sure !!
thank you !!! :blobheart:

in case of LRADs at protests, important, pls boost+++ 

@raekh
"As luck would have it, paper or thin poster boards (the glossier the better), protect better than a wide range of acoustic shields that I've tested. Obviously this isn't 100%, nor does it work like earplugs in front of a normal speaker. If the police or military are aiming a LRAD at you, LEAVE THE AREA IMMEDIATELY TO PREVENT PERMANENT HEARING DAMAGE."
youtube.com/watch?v=3sqIvak-4E

nyc protests, important, pls boost+++ 

@raekh what is the range? do we know..?

nyc protests, important, pls boost+++ 

@Hi_cial i found an infographic hold on

nyc protests, important, pls boost+++ 

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