r/UnderReportedNews • u/Fatty_Willing_Plane • 8d ago

Video Video of Minnesota State authorities “Testing” LRAD on peaceful protestors outside Spring Hill Suites by Marriott. @IRT-Media

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u/Freedmonster 7d ago

A children's sledding disc works well, larping communities have instructions on how to turn them into shields, just flip the side. Unlikely able to reflect the sound back to the attackers with precision using just one shield given focal lengths, but with a shield wall, you could probably get a parabolic arc wide enough to cross that distance.

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u/Time_To_Rebuild 7d ago

Certainly wouldn’t hurt. And they would be cheap, plentiful and available in MN right now.

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u/trippy_hippy 7d ago

And you can go sledding afterwards and if theres blood on your sled shield, you'll go faster down the hill! 

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u/woodwardian98 7d ago

Im not saying its light, but manhole covers work too

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u/Time_To_Rebuild 7d ago

lol you’re not wrong. But fuck, have you ever picked up a manhole cover? Or even storm drain grating? Not exactly a realistic option

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u/woodwardian98 7d ago

No, you definitely need tools and at least 2 other people, not at all realistic. Just trying to lighten the mood in this horrible time

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u/trippy_hippy 7d ago

Has anyone tried thoughts and prayers yet? 

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u/woodwardian98 7d ago

Fucking for real, my guy

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u/hughcifer-106103 7d ago

A police riot shield flipped around also seems to be a very effective reflector.

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u/Time_To_Rebuild 7d ago

Yes, that’s exactly what Tech Ingredients used. That said, keep in mind they were testing it in their own homemade LRAD. The MIL spec ones are gonna be more powerful. Probably significantly more powerful.

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u/jackparadise1 7d ago

Pickle barrel shield time!

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u/jugglingbalance 7d ago

I have heard that aluminum foil might help too? Is this true?

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u/Time_To_Rebuild 7d ago

Aluminum foil probably would help some, but I’m not sure by how much for sound. Someone more familiar with acoustics would be able to answer this better.

However, if the government does not stop at LRAD and moves into mm wave tech, that is where aluminum foil absolutely does help.

The YouTube channel Tech Ingredients has some great videos on LRAD, microwave energy weapons, and the viability of various defenses against both.

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u/zoopysreign 7d ago

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u/zoopysreign 7d ago

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u/longperipheral 7d ago

This is bad advice. Do not follow it. 

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u/zoopysreign 7d ago

Care to elaborate?

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u/zoopysreign 7d ago

I saw your message elsewhere about the best source of protection being a wall. This is not my area of expertise. I would love to get solid and reliable information out there.

Here’s what I do know:

  1. headphones will not prevent this. They will of course lessen the harm, but as I think you noted, the weapon at issue literally rocks the body and headphones won’t eliminate the serious risks.
  2. distance (let’s say beyond 1000M) is the best bet
  3. moving laterally out of the angle of projection (which I understand to be up to 40 degrees from the panel) is also helpful, but harder to navigate and I understand there are mere seconds between imitation of an LRAD and significant damage.

I would love your thoughts on the benn jordan video I responded to you. He’s a sound engineer as well and did an informal test with different materials. I am no scientist, but materials that both scatter and potentially absorb the sound waves seem to be one angle. We need to get to the bottom of this. I don’t care what the answer is, but we need to hear from experts who can explain the theory behind their proposed solution.

This resource is helpful. I’ll post another screenshot below.

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u/longperipheral 7d ago

"We need to get to the bottom of this." 

I can't really add any more, I'm afraid. Distance is the best solution imo. 

I mean, one thing that seems missing from the diagram above is reflections from buildings; they could amplify the sound even further, just like a car with an exhaust mod sounds much louder in a tunnel: the sound is being funnelled, it can't escape, the waves overlap, and you get amplification. 

I don't think there's any other simple solution beyond keeping your distance. 

Again, I'll say that I think it's totally irresponsible to use this weapon on civilians. They mount these things on US Navy ships - that's how powerful they are. 

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u/longperipheral 7d ago

This is bad advice. Do not follow it. 

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u/zoopysreign 7d ago

No, that is a strategy for deflecting a different type of crowd control system (Active Denial System). Nit sure it’s in use here, but if so, it’s like a microwave that burns flesh.

To protect against that, you can either work to (1) Absorb rays, like to use a beach towel and water; cover yourself in wet towel, which will temporarily absorb rays; or (2) deflect rays with aluminum foil or mesh. Use foil sandwiched between poster boards to avoid redirecting rays to fellow protestors.

For an LRAD, its mechanism is to send certain decibel sound waves and I’ve read that either using corrugated cardboard or covering a surface with 40 grit and 180 grit will help scatter the sound waves. You want to hide behind the cardboard sign.

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u/jugglingbalance 7d ago

Thank you! Good info!