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  1. Make Smile

    If you still love Etymotic ER4, this is the thread for you...

    I wonder if er4s needs to burn-in ? It use BA driver.
  2. Make Smile

    If you still love Etymotic ER4, this is the thread for you...

    Er4s use 1BA driver, it still work with burn-in ?
  3. Make Smile

    I am new member, Help me for my etymotic er4s

    I used the same tips for both. Sound of my er4s isn't as good as old er4s. I think if driver has changed because my er4s has seri about 34xxxx, while of my friend has seri 22xxxx, very old.
  4. Make Smile

    If you still love Etymotic ER4, this is the thread for you...

    Yes, the same tips for both
  5. Make Smile

    If you still love Etymotic ER4, this is the thread for you...

    I have just bought an etymotic er4s on amazon, but its sound quality isn't as good as an old etymotic er4s which I sounded it from a my friend. So what is the reason ? It needs to burn-in or reason else ?
  6. Make Smile

    I am new member, Help me for my etymotic er4s

    I've just bought an etymotic er4s IEM on amazon, but it sound different than an old er4s of a my friend. So what is the reason, because the driver has changed or new er4s need to burn-in.
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