question: What causes my earbuds' volume to lower whenever I yawn or stretch while wearing them?
comment: The volume coming out of the earbuds doesn't change, but your perception of it does. Both of those actions involve your body changing the ear canal, which can cause sounds to sound different. Possibly the seal between your ear and the earbud is broken, leading to escaping sound. Possibly it's a change in the pressure in your ear caused by manipulating the Eustachian tube or the eardrum itself, which causes the eardrum to vibrate a bit differently. There could be numerous reasons why sounds are different during those two actions.
passages: One simple method for checking earmuff fit is to lift one or both muffs away from the head while in a noisy environment. If the noise is considerably louder with the adjustment, then the earmuffs are providing at least some degree of noise reduction.
   Section::::Status.
   During the amount of time an individual wears earmuffs, the device can be jostled and displaced from the proper position that allows for the highest attenuation. This can be common in the workplace, as many individuals are in motion during the time they are wearing the hearing protection device. Moving the jaw while chewing or talking and perspiration are examples of ways in which readjustment can occur, causing the seal to be broken between the earcup and skin and allowing sound to leak in.
  
  Section::::Hearing protection.:Barriers to effectiveness.:Deterioration.
   Active earmuffs have an electronic component and microphones that allow the user to control their access to communication while attenuating background noise. When in loud, hazardous settings, the wearer may still be required to listen to outside sources, such as machinery work, their supervisor's commands, or talk to their colleagues. While the material and design of the muff allows for a reasonable attenuation (roughly 22 dBNRR), the user has the option to allow some sounds in that are necessary for their job. These earmuffs incorporate a volume control to increase and decrease the attenuation.
   BULLET::::- Pushing in earplugs into the external ear canal may cause the air pressure to rise in it, in effect pushing against the eardrum and causing pain. This may be caused by pressure on the ear while lying down on the side, and is also the case when completely expanded foam earplugs are pushed further into the ear. To bypass the latter risk, such earplugs are instead removed, compressed and inserted to the desired depth. Vice versa, when pulled out, the resultant negative pressure pulls the eardrum. Therefore, some earplugs are better carefully screwed or jiggled out rather than yanked out. Yawning does not help to equalize this air pressure difference, since it equalizes the pressures between the middle ear and the environment, while this overpressure rather is located in the outer ear, between the eardrum and the earplug.
   When the album was released on Spotify, it contained an alternate version of "Headup" running a full minute longer than the original release.
  
  Section::::Critical reception.
   A person with normal hearing can experience this by sticking their fingers into their ears and talking. Otherwise, this effect is often experienced by hearing aid users who only have a mild to moderate high-frequency hearing loss, but use hearing aids which block the entire ear canal.
   Section::::Reception.
   Section::::Reception.
   BULLET::::- They may cause irritation of the temporomandibular joint, which is located very close to the ear canal, causing pain. Individually fitted non-elastic earplugs may be less likely to cause this irritation compared with foam ones that expand inside the ear canal.
   There are different earmuff style options for HPD users. Styles include: cap-mounts for hard hats, neckbands for use with welding helmets and faceshields, folding earmuffs are meant to be portable and easy to store, and multi-position earmuffs worn in varies positions are useful for versatility to wear both earmuffs and other safety ware, such as glasses or masks. 
  
  Structural transmission
  
  It is possible for sound to transmit through the earmuff materials, reducing the device's effectiveness. This transmission is primarily seen above 1000 Hz.
  
  Vibration of the earmuff
   Section::::Content.
   The amount of masking will vary depending on the characteristics of both the target signal and the masker, and will also be specific to an individual listener. While the person in the example above was able to detect the cat scratching at 26 dB SPL, another person may not be able to hear the cat scratching while the vacuum was on until the sound level of the cat scratching was increased to 30 dB SPL (thereby making the amount of masking for the second listener 20 dB).
  
  Section::::Simultaneous masking.
   Section::::Background.
   To determine the comfort of earplugs used for sleeping, it is important to try them on while actually lying down. The pressure on the ear between the head and pillow may cause significant discomfort. Furthermore, just tilting the head back or to the side causes significant anatomical changes in the ear canal, mostly a reduction of the ear canal diameter, which may reduce comfort if the earplug is too large.
  
  Section::::Types and use cases.:Protection from water.
   Attempting to fully insert the longer (17 mm) plug into a receptacle designed for the shorter (15 mm) plug may damage the receptacle, and may damage any electronics located immediately behind the receptacle. However, partially inserting the plug will work as the tip/ring/ring distances are the same for both variants.
   Section::::Potential risk factors.:Temperature and heat exposure.
  
  The temperature and heat levels of the body are directly correlated with the temporary threshold shifts of the ear. When the levels of blood temperature increase, these threshold shifts increase as well. The transduction of sounds requires an oxygen supply that will be readily depleted due to the prolonged threshold shifts.
  
  Section::::Potential risk factors.:Physical activity.
   The band released four singles and three music videos prior to the album's release. On April 4, 2018, the band released the lead single "Midnight Crusade", accompanied with its music video. Two days later, "Midnight Crusade" was made available on Spotify and Apple Music. On May 4, 2018, the band released the second single, "Son of Robot". The third single, "Care", accompanied with its music video, were each released on May 25. The fourth single, "Count Bassy", was released on June 5, 2018, along with its music video.
   Researchers at Asius Technologies have designed a synthetic membrane to take the brunt of the pounding in earphones away from the ear drum by disrupting the pressure waves. This new membrane technology can be retrofitted and applied to existing headphones. A film of medical-grade polymer (ePTFE) is stretched over a hole, essentially acting as a membrane to help absorb pressure buildup in the ear drum.
   For best results they are molded in the ear while in the position that they will be used. For instance, if they are to be used for sleeping then they should be molded in the ear while lying down, as different positioning of the jaws causes significant changes to the form of the ear canal, mostly a reduction of the diameter, risking the sleep earplug to be made too large otherwise. These changes can be felt by feeling with a finger just at the entrance to the ear canal while moving the jaws sideways, up and down or anterior and posterior.
   The last situation where masking occurs is called central masking. This refers to the case where a masker causes a threshold elevation. This can be in the absence of, or in addition to, another effect and is due to interactions within the central nervous system between the separate neural inputs obtained from the masker and the signal.
  
  Section::::Effects of different stimulus types.
  
  Experiments have been carried out to see the different masking effects when using a masker which is either in the form of a narrow band noise or a sinusoidal tone.
   BULLET::::- In 2012, a Japanese gadget project, neurowear, released Necomimi: a headset with motorized cat ears. The headset is a NeuroSky MindWave unit with two motors on the headband where a cat's ears might be. Slipcovers shaped like cat ears sit over the motors so that as the device registers emotional states the ears move to relate. For example, when relaxed, the ears fall to the sides and perk up when excited again.
   The World Health Organization warns that increasing use of headphones and earphones puts 1.1 billion teenagers and young adults at risk of hearing loss due to unsafe use of personal audio devices. Many smartphones and personal media players are sold with earphones that do a poor job of blocking ambient noise, leading some users to turn up the volume to the maximum level to drown out street noise. People listening to their media players on crowded commutes sometimes play music at high volumes feel a sense of separation, freedom and escape from their surroundings.
   Zoom creep
  
  Zoom creep is a phenomenon in zoom lenses where the angle of view of the lens changes when gravity is allowed to freely act on it. If the lens has a zoom ring, holding it when the lens is held upwards or downwards will prevent this change. In lenses with push-pull zoom, creep is prevented by holding the extending part of the lens. Some lenses, such as the Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical [IF] and Canon EF-S 18-135mm f/3.5-5.6 IS STM, have a zoom lock to stop the effect.
   Section::::Hunting and firearms.
  
  The shooting of guns for recreational use can lead to hearing loss in the high frequencies. The shooting of firearms can cause damage to a variety of cochlear structures due to the high peak sound pressure levels that they generate. This can range from 140 to 175 dB .
  
raw_presuppositions: Earbud volume decreases when yawning or stretching. The volume of earbuds lowers when yawning or stretching while wearing them.
raw_corrections: The earbud wearer's perception of volume decreases when yawning or stretching. The volume does not change, but the perception of the volume does since yawning or stretching changes the ear canal.