Normally new speakers drivers needs to run-in, and the period of running-in a speakers drivers is varies and depends on how often you use it at and how loud you play.
After your speakers drivers has run-in(might take 1 week, 2 weeks or maybe more), Tune up your whole Z906 Speaker Driver System with spectrum analyzer(I presume you know how to use it) then the sound will be decent and very clear from low to high frequency, for gamings & movies the positioning and the boom(bass) will be super tight & clear and for music almost all the music equipment will be very clear and if you have DTS Sound Files for testing you will feel that as if you are listening to the music life .