6. Why does sound come out of the smartphone’s speakers even when the E18 is recognized by the smartphone?

A:  1.  USB 音效 output may not be enabled.  Select models from e.g. Sony 和 Meizu have such a system setting.

2. Different smartphones 和 different versions of firmware on the same smartphone impose different conditions on USB 音效 output.  You may try using players that attempt direct USB audio output, such as HibyMusic (https://play.google.com/store/apps/details?id=com.hiby.music), USB 音效 Player Pro (https://play.google.com/store/apps/details?id=com.extreamsd.usbaudioplayerpro) or Onkyo HF Player (https://play.google.com/store/apps/details?id=com.onkyo.jp.musicplayer).  If it still doesn't work using these players, it may be assumed that the smartphone hardware 支持部门s USB OTG but not USB OTG audio.