ISSUE:
    The sound on the X3 headphone is low when powered on and returns to normal
    volume when the volume control is turned up. 
 
SYMPTOM DESCRIPTION:
    You put on the headphones, turn them on, and the sound is lower than 
    expected. In response, you turn up the volume, then the sound level
    returns to normal volume. 
 
EXPLANATION:
    The headphone amplifier is designed to prevent a "pop" sound when the
    power turns on. To accomplish this, the amplifier mutes the output until 
    it senses an input level that is loud enough to qualify as a valid input 
    signal. Once it senses the input signal, it comes out of the mute state 
    and the sound plays at normal volume. You may notice this if the
    headphones are powered on when the volume control is set to a level below
    the threshold, which typically less than 30% of the maximum setting.  
 
SOLUTION: 
    If you turn on the headphones and don't hear anything, turn up the volume
    control until the sound kicks in, or blow into the mic and the sound from
    your breath will be enough to turn on the amplifier.
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