Dell XPS 8930 Setup And Speci?Cations page 13

Connect peripherals, such as storage devices and printers. Provides data transfer speeds up to 10 Gbps.
8 Front L/R surround line-out port
Connect audio-output devices such as speakers and amplifiers. In a 2.1 speaker channel setup, connect the left and right speakers. In
a 5.1 or a 7.1 speaker channel setup, connect the front-left and front-right speakers.
9 Rear L/R surround port
Connect audio-output devices such as speakers and amplifiers. In a 5.1 speaker channel setup, connect the rear-left and rear-right
speakers.
10 Center/subwoofer LFE surround port
Connect the subwoofer.
NOTE: For more information about the speaker setup, refer to the documentation that shipped with the speakers.
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