How Effective Are The Acoustic Earcups? What Should I Pay Attention To When Purchasing?

The effect of soundproofing earmuffs depends on the sound insulation value, generally you can look at the NRR coefficient, the higher the NRR, the better the general sound insulation performance. And this effect is determined by the sound insulation method: active noise reduction and passive noise reduction.
Passive noise reduction is to directly use the sound insulation material in the earcup for sound insulation, generally using sound insulation cotton.
Active noise reduction is to add a device in the earcup, which emits reverse sound waves at the same time when receiving external noise waves, and two opposite sound waves will cancel out to achieve the effect of noise reduction.
Then there is an electronic noise-canceling earmuff with a pickup function, generally also known as tactical earmuffs, sports shooting earmuffs, don't look at the literal seems to be used in wooden warehouses, many workers working on the construction site can actually use it. For example: long-term work on the construction site will be disturbed by long-term noise, and hearing will be very damaged; Wearing earmuffs can effectively reduce noise, but if there is danger on the construction site, the pickup function comes into play: it will transmit the shouts of others to you, the warning sounds outside, into the earmuffs for you to hear clearly, so that you can reduce the noise at work while still hearing in all directions.
As for the purchase precautions:
1. Depending on the environment you need to use, choose general earmuffs or pickup earmuffs, and active noise reduction is generally thousands, which is not affordable.
2, comfort, some cottage earmuffs may sound insulation performance up, but there will be chucks too tight, poor material and other problems, this aspect to search for other people's use evaluation, or there is a physical store field trial is the best.
3, whether to support the replacement of accessories, such as sound insulation cotton is required to be replaced regularly, can not expect a piece of cotton to be used for five or six years and the effect is consistent, without the use of earmuffs The size of the sound insulation cotton used is also different, so it is best to brand goods with accessories for sale (DIY high play separately).