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ti-resources:shielding [2025/06/27 22:40] – batmathti-resources:shielding [2025/07/02 08:26] (current) – batmath
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-===== Shielding against Gangstalkers using Sound and Microwave (EMF) Protection =====+===== Shielding against Gangstalkers Sound and Microwave (EMF) Weapons =====
  
 This page describes protection against gang stalkers and their weapons. Gagstalkers use mainly sound based technologies for electronic harassment and sounds sent to the ears and combined sound based and microwave (EMF) based technologies for muscle control and causing pain and other health issues. They target person's muscles using a combination of directed sonic beams that vibrate small spots on specific muscles and EMF field or microwave beams that increase body voltage around the muscle and make larger vibrations possible. Electronic harassment and telepathy is achieved by a combination of body vibrations that carry sound, use of head and neck muscles and vocal cords, and real sounds sent to the ear hidden as noise. Pain is typically the result of microwave beam that causes heating of skin and minor tissue damage and muscle vibrating under the area that make pain felt stronger. Their technologies are described in [[articles:gangstalking_technology_summary|Gangstalking Technology Summary]].   This page describes protection against gang stalkers and their weapons. Gagstalkers use mainly sound based technologies for electronic harassment and sounds sent to the ears and combined sound based and microwave (EMF) based technologies for muscle control and causing pain and other health issues. They target person's muscles using a combination of directed sonic beams that vibrate small spots on specific muscles and EMF field or microwave beams that increase body voltage around the muscle and make larger vibrations possible. Electronic harassment and telepathy is achieved by a combination of body vibrations that carry sound, use of head and neck muscles and vocal cords, and real sounds sent to the ear hidden as noise. Pain is typically the result of microwave beam that causes heating of skin and minor tissue damage and muscle vibrating under the area that make pain felt stronger. Their technologies are described in [[articles:gangstalking_technology_summary|Gangstalking Technology Summary]].  
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 === Shielding Materials === === Shielding Materials ===
  
-Sound protection can be achieved by materials that can compress and absorb the sound waves due to their rigid nature (foams and other synthetics) and those that reflect the waves at the surface (metals, glass, and water).. Absorbing materials are considered better for sound proofing but do not work as well for powerful narrow directed sound beams. +Sound protection can be achieved by materials that can compress and absorb the sound waves due to their rigid nature (foams and other synthetics) and those that reflect and refract the waves at the surface (metals, glass, and water) which is sometimes referred to as blocking. Absorbing materials are considered better for sound proofing but do not work as well for powerful narrow directed sound beams. Thicker materials are needed to absorb or bock low frequency (longer wavelength) sound waves.
  
-Protection against Radio,, Microwave and EMF is best achieved by materials that act as a barrier to electromagnetic wave propagation. These are the materials which are good conductors of electricity (such as copper, aluminum, nickel) and outside EMF field creates a current in these materials instead of having waves go further.  Faraday is as an inventor of this method and purposely designed EMF materials are named after him.+Protection against Radio,, Microwave and EMF is usually achieved by materials that act as a barrier to electromagnetic wave propagation. These are the materials which are good conductors of electricity (such as copper, aluminum, nickel) and outside EMF field creates a current in these materials instead of having waves go further. Faraday is an inventor of this method and EMF soft and wear materials are named after him. Short but powerful EMF bursts however can pass through thin layer of Faraday fabric.
  
 <WRAP box> <WRAP box>
-{{:wiki:soundproofing_mineralwool.jpeg?nolink&200 |}}+{{ti-resources:soundproofing_mineralwool.jpeg?nolink&200 |}}
 ** Rigid Synthetics - Fiberglass and Mineral Wool**\\ ** Rigid Synthetics - Fiberglass and Mineral Wool**\\
-<wrap safety>Best Air Sounds Protection</wrap><wrap warning>No EMF Protection</wrap>\\+<wrap safety>Best Air Sounds Protection</wrap> | <wrap warning>No EMF Protection</wrap>\\
 These are the most popular sound proofing materials. These also work well as heat insulation and thus are often used as building materials between walls. These materials are good at absorbing sound above 1kHz but not as good at lower frequencies and infrasound, which is what gangstalkers use when targeting and controlling muscles. Density varies from 2# (lb) per sq ft to 8" # per sq ft. 6# or more density synthetics are recommended as higher density partially compensates for issues with blocking lower frequencies. These are the most popular sound proofing materials. These also work well as heat insulation and thus are often used as building materials between walls. These materials are good at absorbing sound above 1kHz but not as good at lower frequencies and infrasound, which is what gangstalkers use when targeting and controlling muscles. Density varies from 2# (lb) per sq ft to 8" # per sq ft. 6# or more density synthetics are recommended as higher density partially compensates for issues with blocking lower frequencies.
 ++++ Clock here for links to to where you can buy materials  | ++++ Clock here for links to to where you can buy materials  |
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 ++++ ++++
 </WRAP> </WRAP>
 +
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-{{:wiki:soundproofing_polyurithane.jpg?nolink&200 |}} +{{ti-resources:soundproofing_polyurithane.jpg?nolink&200 |}} 
-** Foams- Polyurethane foam and HDPE Foam **\\ +** Foams - Polyurethane Foam and HDPE Foam **\\ 
-<wrap notice>Cost Efficient Sound and Vibration Protection</wrap><wrap caution>Some EMF Protection</wrap>\\ +<wrap notice>Cost Efficient Sound and Vibration Protection</wrap> | <wrap caution>Some EMF Protection</wrap>\\ 
-Polyurethane is an inexpensive rigid plastic which has good sound-proofing and anti-vibration qualities. Foam is commonly used for sound proofing and acoustic installations in general, though we recommend larger sheets instead more often used smaller pieces. The foam is also commonly used for mattresses, including popular memory, which is a recommended option for all TIs. {{:wiki:soundproofing_memoryfoam.jpg?nolink&100 |}} +Polyurethane is an inexpensive rigid plastic which has good sound-proofing and anti-vibration qualities. This foam is commonly used for sound proofing and acoustic installations in general, though we recommend larger sheets instead more often used smaller pieces. This foam also has some EMF shielding qualities and is used electronics packaging and insulation. The foam are also used for mattresses, including popular memory foam, which is a recommended option for all TIs. {{ti-resources:soundproofing_memoryfoam.jpg?nolink&100 |}} 
-While not quite as good as mineral wool and fiberglass at higher frequencies, it appears to work well against lower frequencies of gangstalkers acoustic weapons. This material is also the best option for under-cloth wear which can partially helps against sound beams outside  HDPE foam, which is hard to find, is also a good option and would work slightly better than Polyurethane,+While not quite as good as mineral wool and fiberglass at higher frequencies, it appears to work well against lower frequencies of gangstalkers acoustic weapons. This material is also the best option for under-cloth and in-shoe wear and can partially helps against sound beams or attempts to heat the foot.  HDPE foam, which is hard to find, is also a good and would work slightly better than Polyurethane for sound protection.
 ++++ Clock here for links to to where you can buy materials  | ++++ Clock here for links to to where you can buy materials  |
   * [[https://www.amazon.com/GoTo-Foam-Height-Upholstery-Cushion/dp/B07W547BHJ]] (polyurethane)   * [[https://www.amazon.com/GoTo-Foam-Height-Upholstery-Cushion/dp/B07W547BHJ]] (polyurethane)
 ++++ ++++
 </WRAP> </WRAP>
 +
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-{{:wiki:soundproofing_hdpe.jpeg?nolink&200 |}}+{{ti-resources:soundproofing_hdpe.jpeg?nolink&200 |}}
 ** Hard Plastics - HDPE, Acrylic, Polyester **\\ ** Hard Plastics - HDPE, Acrylic, Polyester **\\
-<wrap safety>Best Sonic Beams Protection</wrap><wrap caution>Minor EMF Protection</wrap>\\ +<wrap safety>Best Sonic Beams Protection</wrap> | <wrap caution>Minor EMF Protection</wrap>\\ 
-Most plastics absorb sounds releasing is energy as heat. HDPE, Acrylic and Polyester have the best sound absorption properties and are used for sound proofing.. HDPE is recommended over other plastics due to it being denser and thus better at blocking very narrow direct sound beams, and because it can block lower frequencies better. Acrylic is recommended for windows and other areas that require light to pas through. {{:wiki:soundproofing_cuttingboards.jpeg?nolink&100 |}} Dense HDPE is commonly used for cutting boards, which are easy to get household item that can be used as shields to disrupt sound beams. More complex sound proofing would require 2" or more of HDPE (note that thick sheets of HDPE are very heavy). +Most plastics absorb sounds releasing is energy as heat. HDPE, Acrylic and Polyester have the best sound absorption properties and are used for sound proofing.. HDPE is recommended over other plastics due to it being denser and thus better at blocking very narrow direct sound beams, and because it can block lower frequencies. Acrylic is recommended for windows and other areas that require light to pass through. {{ti-resources:soundproofing_cuttingboards.jpeg?nolink&100 |}} Dense HDPE is commonly used for cutting boards, which are easy to get household item that can be used as shields to disrupt sound beams. More complex sound proofing would require 2" or more of HDPE (note that thick sheets of HDPE are very heavy). 
 ++++ Clock here for links to to where you can buy materials  | ++++ Clock here for links to to where you can buy materials  |
 Large HDPE panels can be bought at: Large HDPE panels can be bought at:
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 +
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-{{:wiki:soundproofing_cement.jpeg?nolink&200 |}} +/* {{ti-resources:faraday_fabric.jpg?nolink&200 |}} */ 
-** Cement and Concrete ** +{{ti-resources:aluminum_foil_insulation.jpg?nolink&200 |}} 
-Cement is used to create concrete blocks, a very  common building material. Cement reflects sound waves well and can help to block sound of any frequency, including low frequencies that sound absorbing materials have problems with. Porous concrete with >20% air gaps, also known as pervious or permeable concrete, is particularly good because like rigid synthetics it contains air packets that can trap the sound and create additional boundaries for sound waves. This is a recommended material for walls outside the house which can be the 1st line of defense against acoustic weapons. Concrete can also be an option for some inside sound-proofing designs. To achieve blocking of gangstalker's sonic weapons with concrete alone, requires more than 4 ft (1 meter) thick barrier made of porous concrete. +** Faraday Fabric. Metal Mesh and Metal (Aluminum) Foils **\\ 
 +<wrap warning>No Sounds Protection</wrap> | <wrap safety>Good and Cost Efficient EMF Protection</wrap>\\ 
 +"Faraday Fabric" is a general name for typically thing protective EMF materials that incorporate metal such as copper, aluminum, nickel within a fabric or another form of soft material. Typically the resulting material is silver colored. Similar are "metal mesh" material which are targeted for both anti EMF and other uses .Another option is Aluminum Foil Panels sold for insulation, with 4-8 layers of these these are effective against gangstalker's weapons and still inexpensive. While all o these use metal, the layers are not solid enough to provide protection against sound, however some synthetic fabrics used as as base for it do have minor sound absorption properties. 
 +++++ Clock here for links to to where you can buy materials  | 
 +  * [[ https://www.michaels.com/product/faraday-fabric-copper-nickel-cloth-320224571982774277 ]] Faraday Fabric roll ($25) 
 +  * [[https://www.amazon.com/dp/B0CPBHXNWS?ref=ppx_yo2ov_dt_b_fed_asin_title]] Copper Mesh that can be used for EMF protection ($90) 
 +  * [[ https://www.amazon.com/dp/B0CH1HXMJL?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 ]] 24 sheets (24"x48"x0.25" each) aluninum foil bubble insulation ($125) 
 +++++
 </WRAP> </WRAP>
 +
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-{{:wiki:soundproofing_steelplate.jpeg.jpg?nolink&200 |}} +{{ti-resources:soundproofing_steelplate.jpeg.jpg?nolink&200 |}} 
-** Metals: Steel and Aluminum **\\ +** Solid Metals: Aluminum, Copper, Steel **\\ 
-<wrap notice>Sound Blocking Protection</wrap><wrap safety>Strong EMF Protection (Aluminum)</wrap>\\ +<wrap safety>Strong Sound Blocking Protection (Steel)</wrap> | <wrap safety>Strong EMF Protection (Copper, Aluminum)</wrap>\\ 
-Metals both reflect and and absorb the sound, mainly due to due to inaccuracies in the structure. Dense and heavy metals, like steel, are strong sound blockers. Steel plates can supplement external and internal sound proofing design and 2" or thicker steel barriers may block all sound beams. Aluminum sheets are much less expensive and effective, but can be used as part of sound proofing design too.+Metals both reflect and and absorb the sound, mainly due to due to inaccuracies in the structure. Steel offers by far the best protection of all metals (or other materials) especially thick 1" or more. It is also very heavy and quite expensive compared to rigid materials. While it can offer some EMF protection Steel is not as good as Copper and Aluminum which are the base materials out of which Faraday fabric is made. Aluminum and Copper are usually not sold as thick sheets that can offer strong sound protection, nevertheless some sound would be reflected from any metals. As metals offer the strongest protection if you can get them inexpensively (especially thick sheets) and have proper experience and tools to build protective environment using it you should use it as as a base. If buying new, use other materials.
 </WRAP> </WRAP>
 +
 <WRAP box> <WRAP box>
-{{:wiki:soundproofing_glass.jpeg?nolink&200 |}} +{{ti-resources:soundproofing_glass.jpeg?nolink&200 |}} 
-** Glass ** +** Glass ** \\ 
-Glass is another material that reflects the sound. For glass to be a good sound blocking material it has to be dense and thick, such as glass found in glass coffee tables.. Most windows do not have such glass and pass sound waves from outside - double windows can help but is not enough and acrylic panels further inside are recommended as an additional blocking layer. +<wrap notice>Good Sound Blocking Protection</wrap> | <wrap warning>NO EMF Protection</wrap>\\ 
- </WRAP>+Glass is another material that reflects the sound. For glass to be a good sound blocking material it has to be dense and thick, such as glass found in glass coffee tables.. Most windows do not have such glass and pass sound waves from outside - double windows can help but is not enough and acrylic panels further inside are recommended as an additional blocking layer. Glass passes on light and other EMF, to block EMF at the windows special "EMF shielding window films" and curtains made from Faraday fabric are needed. Fully protective environments should have all windows permanently sealed.  
 +</WRAP> 
 + 
 +<WRAP box> 
 +{{ti-resources:soundproofing_cement.jpeg?nolink&200 |}} 
 +** Cement and Concrete ** \\ 
 +<wrap notice>Sound Blocking Protection</wrap> | <wrap caution>Some EMF Protection</wrap>\\ 
 +Cement is used to create concrete blocks, a very  common building material. Cement reflects sound waves well and can help to block sound of any frequency, including low frequencies that sound absorbing materials have problems with. Porous concrete with >20% air gaps, also known as pervious or permeable concrete, is particularly good because like rigid synthetics it contains air packets that can trap the sound and create additional boundaries for sound waves. This is a recommended material for walls outside the house which can be the 1st line of defense against acoustic weapons. Concrete can also be an option for some inside sound-proofing designs. To achieve blocking of gangstalker's sonic weapons with concrete alone, requires more than 4 ft (1 meter) thick barrier made of porous concrete.  Concrete can block some electromagnetic radiation but should not be relied on to protect against EMF. 
 +</WRAP> 
 <WRAP box> <WRAP box>
-{{:wiki:soundproofing_waterbath.jpeg.jpg?nolink&200 |}} +{{ti-resources:soundproofing_waterbath.jpeg.jpg?nolink&200 |}} 
-** Water and other liquids ** +** Water and other liquids ** \\ 
-Water reflects up to 99% of sound from air and is the most effective and inexpensive solution. It is difficult to use it as part of sound proofing design, but it can be done with a stack of flat water tanks in a frame.  Water beds are an option to help with sleep,  but they are rarely allowed in rental places. Bath will give some relief and pools are even better. After bathing many of the beams targeting muscles could be disrupted. Scuba diving would result in disconnection and swimming in an ocean or a lake could do it too. ++ Additional tips on bathing and using liquids|Bathtubs can also reveal the presence of sound beams and you may see a wave emanating from a specific spot on a side. If you regularly listen to white-noise, consider getting a water resistant bluetooth mp3 player speaker for when you’re taking a bath. \\+<wrap notice>Good Sound Blocking (Reflection)</wrap> | <wrap safety>Strong EMF Protection</wrap> \\ 
 +Water can both block EMF and sound making it the most effective inexpensive solution. With EMF it works because it has many free ions and can conduct electricity and thus is metals used by Faraday. Water can pass sound, but waves entering the water from the air are largely reflected back and refracted (up to 99%) changing direction. When enclosed within solid container this is less effective and only some sound is blocked by refraction. Water is difficult to use when building protection area, but it can be tried using flat water tanks in a frame.  Water beds are also an option,  but if they break its a problem and they are rarely allowed in rental places. Bath can give some relief and pools are even better. After bathing many of the beams targeting muscles could be disrupted. Scuba diving could result in disconnection and swimming in an ocean or a lake could do it too. ++ Additional tips on bathing and using liquids|Bathtubs can also reveal the presence of sound beams and you may see a wave emanating from a specific spot on a side. You can record this with a phone camera for evidence. If you regularly listen to white-noise, consider getting a water resistant bluetooth mp3 player speaker for when you’re taking a bath. \\
 \\ \\
 For those wishing to use water as part of sound-proofing design, check out these: \\ For those wishing to use water as part of sound-proofing design, check out these: \\
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 ++ ++
 <WRAP tip> <WRAP tip>
-Though not properly understanding the reasons why it works, a number of targeted individuals noted that water is effective against gangstalker's weapons and technology. Simple solutions include using water battles as shields against (sound) beams. Going further [[ https://web.archive.org/web/20250118100130/http://www.targetedjustice.com/water-shielding.html | people have created water based full head shield. ]]+A number of targeted individuals noted that water is effective against gangstalker's weapons and technology. Simple solutions include using water battles as shields against (sound and emf) beams. Going further [[ https://web.archive.org/web/20250118100130/http://www.targetedjustice.com/water-shielding.html | people have created water based full head shield. ]]
 </WRAP> </WRAP>
 </WRAP> </WRAP>
  
-Building a sound-proof room is best in an area of the house with cement walls all around, preferably partially or fully underground basement which by itself can make it harder for gangstalkers to shoot beams. Fully sound proofing the area is expensive and would require combination of different materials with 8-12" of mineral wool or fiberglass ($20 per sq ft typically sold as 4 panels 2” thick 24”x48”) and 4" or more of HDPE (1” thick 24”x48” panels costs are approx $20 per sq ft). Sound-proof walls should consist of 2-4 sections with porous concrete or 2” air gap between. Polyurethane foam can replace mineral wood or fiberglass in one of the sections. A stack of flat water tanks could be used between sound proofing layers made of other materials replacing air gap. In the basement the floor need not be as thick and can have 4” fiberglass or polyurethane and ½”-1" HDPE. Property walls or barriers outside the house made of concrete can offer additional protection,  the thicker the better.+Building a protective room is best in a basement with cement walls all around or at or around an area with a large water tank. Note that basement by itself does not offer enough of a protection and gangstalkers can shoot through ground and even have beams come from below the basement floor by using machines and devices that are put into sewers. This can be a problem even if your house is in rural area but ha utility connections to a nearby town as many now do. 
 + 
 +Fully sound proofing the area is expensive and hard. EMF protection is somewhat easier to accomplish. If you have access to metals (copper or aluminum) to fully enclose an area from all sides do it. Otherwise for EMF we recommend using Aluminum foil bubble sheets (4-8 of these for a total or 1") together with copper mesh. (at least 2 layers). Sound proofing would also require a combination of different materials with 8-12" of mineral wool or fiberglass ($20 per sq ft typically sold as 4 panels 2” thick 24”x48”) and 2-4" or more of HDPE (1” thick 24”x48” panels costs are approx $20 per sq ft). The design should consist of 2-4 sections with optionally use of porous concrete or 2” air gap between. Polyurethane foam can replace mineral wood or fiberglass in one of the sections. A stack of flat water tanks could be used between the layers made of other materials replacing air gap.  Property walls or barriers outside the house made of concrete can offer additional protection,  the thicker the better. This is not an easy project as you'd be building both a Faraday Cage and Sound Proof room at the same time an it needs to handle a lot more than a typical design people do.
  
 For more more information on sound proofing  materials see: For more more information on sound proofing  materials see:
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-{{:wiki:soundproofing_memoryfoam.jpg?nolink&100 |}}+{{ti-resources:soundproofing_memoryfoam.jpg?nolink&100 |}}
 Polyurethane is an inexpensive rigid plastics with good sound proofing qualities and recommended as a first step in shielding the sleeping area and your body. To protect the feet (most common areas for skin burning while asleep) it is recommended that they be wrapped in 2-4" polyurethane foam when you go to bed. Mattresses made of polyurethane, including "memory foam", are inexpensive and can reduce the effectiveness of projectors below. Recommended are two mattresses - thicker 6" at the bottom and 2"-4" topper above it, both made from polyurethane. This allows for additional materials to be placed between the mattresses. Micro-vibrations at specific spots may still be felt even with 10” or more of foam and this is not a full solution to shield from below. However this be itself may help you and make your life better. Polyurethane is an inexpensive rigid plastics with good sound proofing qualities and recommended as a first step in shielding the sleeping area and your body. To protect the feet (most common areas for skin burning while asleep) it is recommended that they be wrapped in 2-4" polyurethane foam when you go to bed. Mattresses made of polyurethane, including "memory foam", are inexpensive and can reduce the effectiveness of projectors below. Recommended are two mattresses - thicker 6" at the bottom and 2"-4" topper above it, both made from polyurethane. This allows for additional materials to be placed between the mattresses. Micro-vibrations at specific spots may still be felt even with 10” or more of foam and this is not a full solution to shield from below. However this be itself may help you and make your life better.
  
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 <WRAP box> <WRAP box>
-{{:wiki:soundproofing_cuttingboards.jpeg?nolink&100 |}} Other hand shields that can be used include bottles of water, HDPE cutting boards OR small 12x12 or 12x24 pieces of 1/2" thick HDPE panels  These can be placed on top of the spots you feel pain in. Another use is an urge to go to the bathroom which may be the result of targeting the anus. Putting HDPE pieces or cutting boards below your sit may help make this go away. +{{ti-resources:soundproofing_cuttingboards.jpeg?nolink&100 |}} Other hand shields that can be used include bottles of water, HDPE cutting boards OR small 12x12 or 12x24 pieces of 1/2" thick HDPE panels  These can be placed on top of the spots you feel pain in. Another use is an urge to go to the bathroom which may be the result of targeting the anus. Putting HDPE pieces or cutting boards below your sit may help make this go away. 
    
 ++++ Clock here for links to to where you can buy materials  | ++++ Clock here for links to to where you can buy materials  |
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 <WRAP box> <WRAP box>
-{{:wiki:soundproofing_beardtrimmer_1.jpg?nolink&40 |}} +{{ti-resources:soundproofing_beardtrimmer_1.jpg?nolink&40 |}} 
 Another option to relieve pain at a particular spot is use of vibrating hand-held devices like beard trimmers. Technically this is not a shield and is more similar to a massage. It works by over-riding painful vibrations of the muscle and tissue caused by gangs acoustic weapons and vibrating the muscle and the surrounding area at a different non-harmful frequency. Devices that can be used here must produce fast vibrations of several times per second. Beard trimmers and shavers are known to work. Other type of devices and tools you may have may have a similar effect too. Another option to relieve pain at a particular spot is use of vibrating hand-held devices like beard trimmers. Technically this is not a shield and is more similar to a massage. It works by over-riding painful vibrations of the muscle and tissue caused by gangs acoustic weapons and vibrating the muscle and the surrounding area at a different non-harmful frequency. Devices that can be used here must produce fast vibrations of several times per second. Beard trimmers and shavers are known to work. Other type of devices and tools you may have may have a similar effect too.
  
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 <WRAP box> <WRAP box>
-{{:wiki:muscle_simulator.png?nolink&200 | Electronic Muscle Stimulators }}+{{ti-resources:muscle_simulator.png?nolink&200 | Electronic Muscle Stimulators }}
 There are number of consumer muscle stimulators available which can vibrate your body using electric impulses. You can place the electrodes near or at the area you regularly feel pain at (such as shoulder) or more generally spread these on the right or left side of your body. DO NOT turn these to full power and use 1-5Hz vibration settings or else you may feel an electric shock. There are number of consumer muscle stimulators available which can vibrate your body using electric impulses. You can place the electrodes near or at the area you regularly feel pain at (such as shoulder) or more generally spread these on the right or left side of your body. DO NOT turn these to full power and use 1-5Hz vibration settings or else you may feel an electric shock.
  
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 <wrap todo> This section needs to be further expanded </wrap> <wrap todo> This section needs to be further expanded </wrap>
- 
-==== Sound Proofing Materials Theory  [Draft] ==== 
- 
-<wrap todo> This draft needs to be re-written to explain physics theory and define key words and concepts</wrap> 
- 
-Sound beams and waves can be interrupted and protected against by sound absorbing and blocking (sound proofing) and sound-reflection materials. When sound waves in the air are vibrations of air particles, while in the material vibrations within material structure. Many materials are almost as good for sound wave transmission as air. However rigid materials bend as wave travels absorbing its energy which is released as heat. Air packets that trap the sounds greatly help in this process. Such materials are good for sound proofing and sound protection, most popular of these are rigid synthetics and plastics - Fiberglass, Mineral Wool, and Polyurethane Foam.  
- 
-When the sound wave hits any boundary, be it air boundary when it hits some material, or boundary between two different types of materials, then part of the wave is reflected back. Materials that reflect large part of the wave are also good for sound protection and blocking. This include metals, glass, concrete, and water.   
- 
-Materials further differ by how well they protect against different frequencies. While rigid synthetics are in general very good at absorbing frequencies above 1kHz (majority of audible range and ultrasound) they start to fail at lower range audible range and infrasound because of the long wave length corresponding to shorter frequencies. Sound reflection materials generally work about the same and necessary part of sound-proofing design where low frequency sounds and infrasound are frequent. This includes protection against gangstalker's acoustic weapons that use low sound frequencies, particular as it relates to muscles. 
- 
-Another important materials parameter is its density. Denser materials are better at sound absorption but are more expensive. Rigid synthetics used in sound-proofing vary from  2# (lb) per sq ft to 8# (lb) per sq ft with 3# and 6# being most common. Higher density rigid synthetics can partially compensate for their lower performance with low frequencies, as a result 6# Fiberglass or Mineral Wool are recommended for sound protection against gangstalker's weapons.  
- 
-Hard materials that have good sound absorption qualities are plastics -  HDPE  (High Density Polyethylene), Acrylic, and Polyester. Based on direct experience with gangstalkers HDPE is the best for sound-proofing against gang's acoustic weapons Thee materials are also used in some synthetic fabrics (while not as good due to lower density and thickness, it is still better than other options).  
- 
-Why water is a strong blocker of sound waves: 
-* Acoustic Impedance:  Acoustic impedance measures how much a medium resists the passage of sound waves. Air has very low impedance water has a very high acoustic impedance which makes results in high reflection at the boundary. 
-* Sound Speed and Density: The speed of sound in water is significantly higher than in air. Water is also much denser than air.  
-* Critical Angle: Sounds waves that hit the boundary between air and water at an angle higher than the critical angle are almost entirely reflected. Based on the difference between air and water, the critical angle is fairly low. 
- 
-{{tag>TI_Resources Gangstalking Shielding Sound_Technology }}