Dell C100J, DCDO manual found in digital surround sound audio schemes, carries only

center/LFE	Use the (orange) subwoofer connector to attach a single
surround out	subwoofer.
	NOTE: The LFE (Low Frequency Effects) audio channel,
	found in digital surround sound audio schemes, carries only
	low frequency information of 80 Hz and below. The LFE
	channel drives a subwoofer to provide extremely low bass
	extension. Systems not using subwoofers can shunt the
	LFE information to the main speakers in the surround
	sound setup.
line-in	Use the (blue) line-in connector to attach a
connector	record/playback device such as a cassette player,
	CD player, or VCR.
	On computers with a sound card, use the connector on
	the card.
line-out	Use the (green) line-out connector to attach headphones
/headphone	and speakers with integrated amplifiers.
connector	On computers with a sound card, use the connector on
	the card.
microphone	Use the (pink) microphone connector to attach a
connector	personal computer microphone for voice or musical input
	into a sound or telephony program.
side surround	Use the (silver) side surround connector to attach
sound	additional speakers.
connector

Setting up Your Computer

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