[. . . ] Keeping in touch You can learn more about your Gaming Audio Series SP2500 and stay in contact with other SP2500 owners by: · They eliminate the need to run two pairs of speaker cables to each satellite. [. . . ] Tip: the USB connector on the back of the desktop controller is used for optional firmware updates. It is not necessary to connect the desktop controller to your PC via USB for normal use. WARNING: take care when connecting headphones to the SP2500 the first time. We recommend turning the SP2500 volume down all the way before wearing your headphones, and then slowly turning it up. CONTROL DIAL: allows you to scroll through menusandmenuselections, adjustmastervolume, andsubwooferoutput. Rotatethedialtohighlightlanguage, clickthewheeltoselectthelanguagemenu, and then rotate the wheel to scroll through the language choices. [. . . ] 3cm 120W (IEC60268-5 24hr continuous rating)subwooferwithdurablerubbersurround n Bridged dual 60 Watt class-D amplifiers with integratedDSPfor120Wattsofpower n Ultra-efficient integral power supply with 100V­240VACinput Satellites n Bi-amplified, two-way design 76. [. . . ]