4-channels of course!
	Headphone drive on all outputs! [not that u use headphones for the rear channels, but just in case we all evolve with technology and babies after Y2K are born with 4 ears!]
	Can play EAX, A3D1, Q3D1, 2, and of course Dsound3D enabled games through all four outputs.
	QEM (Qsound Environmental Modelling) with all the effects. Need to play the games to hear it.
	QMSS - play your Dolby Surround VCD or DVD and get (almost) full suround effects to 4-speakers.
	As usual, no turn on-turn off pops ! Helps keep my hi-fi speakers live longer.