Earphones are electronic products that people use frequently in daily life. However, different earphones (Kids Headphone Earphones, LED Headphones, Bluetooth Headphones, TWS Bluetooth Earbuds, EarHook Earphones, In Ear Earphones, Earbuds Earphones, Headband Headphones, Gaming Headsets, etc.) have different effects on hearing due to different decibel levels of speakers. The following You will see some CSA rating. This is a method of assessing hearing protection used in Canada.
This is a simple system that is based on tests conducted in the same laboratory that tested hearing protection devices in the United States to obtain NRRS. The system guides the user in selecting the appropriate hearing device for a specific noise exposure level.
Each hearing protector is rated A, B or C.
CSA recommends:
* Class C earplugs or earmuffs can be used for noise levels <90dBA
* Class B earplugs or earmuffs can be used for noise levels <95dBA
* Class A soundproof earplugs or earmuffs can be used for <105dBA noise levels
A and B classes may have an L associated with it. Therefore, hearing protection is divided into A, B, AL, BL, and C.
AL, BL means that the hearing protector attenuates at least 20 dBA when tested at 125 Hz. This is an important factor when choosing a hearing protection device to protect low frequency noise.
Typically, these categories, such as NRR, are a guide for the end user to select the correct hearing protection device. These categories are based on laboratory tests, and actual noise reduction depends on many factors including proper use of equipment, training, and maintenance.
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