xBox 360 and multiple headphones:
Q:  If 10 xbox 360's were being played at once in a large room, the sound
    created by four users on each system would be maddening.  How many Ear 
    Force x1's, x2's, and x3's can be hooked up to a single xbox 360? Can 16
    x3's function simultaneously in the same room if 4 xbox 360's were linked 
    together system link?  Could they function if 16 xbox 360's were linked 
    together simultaneously?

A:  What you wish to achieve is pretty complicated. You cannot use any of 
    the wireless Headphones (X-2, X-3) because due to the nature of wireless 
    technology they will interfere with each other. You should be able to use
    the Wired X-1. However, since the Xbox has only 3 USB ports, you would
    need a USB Hub to increase the USB Ports. Also, since the Xbox has only 
    one audio output, you would need one splitter for each X-1. 

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xBox 360 and multiple Controllers:
Q:  I was told the Xbox 360 supported 4 controllers. Can you tell me the 
    limitations of the 360?  Did I miss something? I may have to rethink 
    this xbox 360 system entirely. 

A:  The issue here is that you cannot have multiple Transmitters. You can 
    connect the headsets onto the same Transmitter listening to the same 
    material.   

    Each controller can have an Earforce headphone connected, no problem.
    HOWEVER -- The one Xbox has only a single pair of RCA audio plugs 
    (audio outputs). Each of our EarForce headphone sets will expect to 
    be connected to this pair of audio outputs. That's where the problems 
    come in...

    Perhaps the best solution would be to purchase one EarForce headset / 
    Transmitter combo, and then purchase three additional headsets. All four 
    headsets will communicate through the Transmitter unit and the Xbox 360. 

    -  Audio playback will come from all four headsets
    -  Headset mic/Live chat will be handled by the Xbox 360, from all four
       headsets.

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Multiple X3 Headsets:
Q:  I am opening a video game tournament store and I have a question about 
    feedback between multiple headsets. I have already purchased 9 of these.
    So, if we have 8 stations set up with only 2 feet between each tv and 
    player will they hear each other's games and chat if they are playing 
    different games? Each headset will have its own receiver. There are no
    walls or barriers between gamers. 

A:  Yes, the headsets will pick up signal from other transmitters in the room.
    Depending on the position of the players and their headsets, the sound 
    may be picked up from any number of other transmitters. That's one reason
    we still offer the X1 wired headset for Xbox 360. The X1 will work better
    in environments with multiple Xboxes in the same room. 

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Two x3 and one Xbox 360 (Case 1):
Q:  Will 2 turtle beach x3 headsets work with one xbox 360? The x3 

A:  You can use two X3 headsets with a single X3 controller on one Xbox 360.
    Both players will hear the exact same game sounds and the same talkback,
    but will hear their own voice in the headset monitor. 

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Two x3 and one Xbox 360 (Case 2):
Q:  But I can't hear the voice of my brother. On halo 3 we can hear other 
    players but not each other.

A:  That's right, because you are logged in as one player. So you can hear
    your own voice, but you can't hear his (although he can hear his own 
    voice in his headset). 

    You can try this: In Live > Dashboard > Personal Settings, set both 
    headsets for the chat to Play Through Both. Maybe then you'll be able 
    to hear each other. 
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