3M™ PELTOR™ X4 Earmuffs offer a slim lightweight option with a Noise Reduction Rating (NRR) between 25–27 dB, depending on attachment type. This low-profile earmuff is ideal for protection against mid- to high-level industrial noise and other loud sounds.

针对3M X4A耳罩和X5A耳罩，其标称降噪值有所不同，X4A的SNR值为33dB，NRR值为27dB， 而X5A的SNR值为37dB，NRR值为31dB；另外，从外形上看两者的差异，X5A的耳罩本体要比X4A厚一些，重量也稍重。 同学买了x5a，戴了20分钟，颈椎不好的我果断放弃。 （太累了，很重） 因为实验室键盘声音大，虽然自己有 AirPods pro，但是依然抵不住机械键盘。 于是买了x4a，如图. 然后用了半小时，申请了退货... 也不是说这玩意不好，主要是我自己用过AirPods …

2018年1月22日 · 首先X5A比X4尺寸大， 吸音棉 更多，耳朵较大的也不会被压住，对人声中高频隔音效果比较好，低频声音减弱效果相对中高频较差，总体效果很好。 带上后刚开始会有点不适应，听不到外界的环境音之后可以适应一些。 X5A体积较大，睡觉想侧翻身是不行的，只能平躺或者趴着。 如果耳罩厚度更小--如X4A，睡觉翻身会舒服多。 我是今年三月份入手的 x5，实在是忍受不了舍友的叫喊声。 隔音效果非常好，另外我还会在耳罩里放一个耳机，简直完美，真的是什 …

頭帶內有不鏽鋼線圈，可在8小時的工作時間維持穩定的張力，提供持續舒適的配戴密合度。

x4a新罩杯垫设计，缩小开孔，提供更高的声衰减，尤其是对低频噪声；新型内衬，使用e-a-r™ 泡棉，提供更佳的声衰减；新型阻尼垫圈底座帮助减小共振，提高声衰减能力。

Key Benefits of the 3M™ E-A-Rfit™ Dual-Ear Validation System include: • Tests both ears simultaneously in less than 5 seconds • Science-based, quantitative testing • Fast, clear and accurate results • Tests 7 frequencies—125Hz to 8000Hz • 3M™ Earplug, earmuff, and headset (comms) testing capability

The X4A utilizes a newly designed spacer, specially formulated foam liners and innovative ear cushions to help improve attenuation. This lightweight, lower-profile earmuff helps with compatibility with other personal protective equipment and is designed for protection against moderate-to-high level industrial noise and other loud sounds.

3M™ PELTOR™ X4 Earmuffs are our lightweight and slim hearing protectors with innovative foam earcup inserts and spacers to help boost attenuation and protect against low frequencies. Available as headband, helmet attachment and neckband models.

★頭帶內有不鏽鋼線圈，可在8小時的工作時間維持穩定的張力，提供持續舒適的配戴密合度。 ★絕緣材質包覆頭帶，無金屬外露，防止低電壓感電危害。 ★雙軌頭帶設計，有助於發散頭頂配戴時產生的熱氣。 ★細緻的塑膠部件，配戴耳罩時可依需求簡單的滑動罩杯的位置。 ★軟質的罩杯外殼塗佈，幫助降低摩擦或碰撞造成噪音。 ★ABS材質隔層，僅增加一點厚度但提供更高的聲音衰減值。 ★現代感、輕薄的設計，兼顧美觀及防護性。 ★罩杯內部大空間，適用各種耳朵尺寸並 …

3M™ PELTOR™ X-Series Earmuffs deliver comfort, design, and protection in one groundbreaking earmuff line. Additionally, these earmuffs have earcup pivot points that tilt for optimum comfort and efficiency, as well as replaceable ear cushions and foam liners to help ensure acceptable noise reduction, hygiene, and comfort.