Plasma TVs can generate Infra Red emission generated by the scanning pulses 
on the TV screen. This IR signal can be sensed by the X3 IR headphones as a
background "buzz" or "crackling" sound. Some plasma TV models have IR filters
to reduce the IR emission. On these models, the "buzz" is significantly
reduced or does not occur at all. It is important to note that this issue 
is not unique to the X3 headphones--all analog IR headphones will exhibit 
this problem with plasma TVs.

In many cases, the background buzz or crackling noise is barely noticeable 
and the X3 transmitter can be positioned such that it is either eliminated 
or drastically reduced. The Plasma interference is most noticeable when there
is no audio playing through the Xbox, so you may hear a slight background
crackling or buzzing on menus or before the game begins. Once the game sound
is playing, the X3 transmitter signal is stronger and the interference is
significantly reduced or completely eliminated.

Plasma IR interference is also significantly reduced the further away you
place the X3 headphones from the plasma screen—typically around 5 feet. 
This is because the IR signal intensity drops off with greater distance 
from the source and also because the X3 transmitter signal is much more 
intense than the IR radiation from the Plasma screen. Therefore, the issue 
may be more noticeable if your Plasma TV is located in a small room rather
than a larger room.

A simple solution to reduce the IR interference when using the X3 with a
Plasma TVs is to maximize the X3 transmitter signal intensity so that it
overpowers the Plasma IR interference signal. This can be accomplished 
by placing the X3 transmitter in direct line of sight with the headphones, 
or by placing it closer to the headphones and away from the plasma screen 
to pass the signal around the Plasma interference, as shown in the 
accompanying illustrations. 

These configurations will help assure a direct beam to the X3 headphones,
thereby maximizing the strength of the X3 IR signal so that it can overpower
the plasma IR interference signal. If the X3 transmitter is placed too low,
too high or too far to the side of the plasma screen, its IR signal will be
reduced because it is off-axis from the headphones. This can result in the
Plasma IR interference being stronger than the X3 signal at the headphones
location, causing the background noise to occur.

  
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