Article ID : 00266157 / Last Modified : 14/09/2021

Notes on using the Noise Isolation Earbud Tips (WF-1000XM4, EP-NI1000)

    IMPORTANT: We recommend to perform regular maintenance on the WF-1000XM4 and learn about the proper way of handling the Earbuds, EP-NI1000 by referring to this FAQ: How to care for the Headphones (WF-1000XM4) 

    When the earbud tips damaged

    When the earbud tips are damaged, contact Sony for further consultation or to purchase the EP-NI1000S, EP-NI1000M, or EP-NI1000L (sold separately).

    WARNING! Do not use solvents such as thinner, benzene, or alcohol when cleaning the earbuds.


    • The EP-NI1000S, EP-NI1000M, or EP-NI1000L may not be supported in some countries or regions
    • The foam materials may become firm at a low temperature. Warm the earbud tips a little with your hands before use
    • When the environmental temperature or usage temperature is high, the polyurethane foam may take time to return to its original shape
    • If you feel that the bass sound has become insufficient (or that the sound quality has deteriorated), exchange the earbud tips with new ones
    • The foam materials used in the earbud tips deteriorate through long-term use and storage. Replace the earbud tips if the deterioration results in reduced performance
    • You may hear cracking or popping noises when wearing the headphones. These noises happen because, when wearing or adjusting the position of the headphones, air bubbles inside the earbuds response to movements of the earbuds. This is normal, and not a malfunction.
    • As the earbud tips fit more snugly in your ears, you may feel a strain to your ears. If you experience discomfort, discontinue use
    • Do not pull on the polyurethane foam portion of the earbud tip. If it is separated from the earbud tip, it will not function
    • Do not subject the polyurethane foam portion of the earbud tip to pressure for over long periods of time. It may cause deformation and it may be difficult to return the earbud tip to the original shape
    • When the earbud tips get soaked, drain the liquid well, and make sure that the earbud tips are dried before use or storage
    • The varying sizes of the holes on the polyurethane foam portion of the earbud tip have no effect on the sound quality