Q: There's a slight hiss coming from the headset. Is there a way to remove it?

A:  There are three potential sources of hiss and noise in the X3 headphones:
    1. The IR audio receiver in the headphones: As in any amplified audio
       signal, there is inherent background noise in the audio IR signal 
       received from the transmitter. To minimize this source of hiss, set the
       input sensitivity on the transmitter so the signal does not distort yet
       is as loud as possible, then turn down the headphone volume to a 
       comfortable level. You can check if this is the source of hiss by 
       turning down the headphone volume to zero.
 
    2. The XBOX controller talkback signal: The XBOX controller can also add 
       hiss and background noise to the headphone signal when the talkback
       cable is connected to the headphones. The amount of noise is
       proportional to the volume control setting on the talkback puck
       inserted into the XBOX controller. Turning down this volume will reduce
       the hiss and noise from the controller. You can check if this is the 
       source of hiss by removing the cable from the headphones. 

    3. The microphone monitor: The X3 microphone signal is routed to the
       headphones so you can hear yourself speak. A byproduct of this is that 
       you will also hear ambient noise around you. If you've turned down the
       headphone volume and unplugged the talkback cable, and you still hear 
       some background hiss, then it's probably coming from the mic picking up
       the sound of your room. This monitor level is preset internally and
       cannot be modified.
 
       One last tip is to make sure you're using fresh batteries. As the
       battery voltage runs down, the circuits inside the headphones can't 
       work at their optimum level, which increases the background noise.
______________________________________________________________________________