Ear Force HPA, HPA2 - FAQs
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Sound Quality: Music vs. Surround 
The different speakers in the HPA Headphones are optimized for different
tasks.

-  The FRONT speakers are the only ones that are truly full-range, which is 
   why you may find that they sound 'better' than any of the other speakers 
   in the HPAs. 

-  The Center speaker is designed for human voice sounds (movie dialogue). 

-  The Rear speakers are designed to sound 'far away' in the surround 
   soundfield, for an added sense of space and depth. This means less bass 
   and highs, and less detailed focus to the sound (less 'presence'). 

     For best results when listening to stereo music, you may wish to 
     turn down the Center and Rear speaker levels. Adjust the Subs to taste. 
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