For DVD, the digital output is generally only fiber optic output, the fiber optic cable will be connected to the digital input of the amplifier, generally analog connection, corresponding to the back of the amplifier's speaker cable connector connection will be able to, if it is the next generation that would be better, HDMI a line can be solved.
Amplifiers have output ports, generally a black and a red for a group, connected to a speaker. 2.0 amplifier will have two groups, connected to the left and right speakers. 5.1 amplifier, there will be six groups of exports, respectively, connected to the front and rear, center, subwoofer. All are labeled. Connect the corresponding speakers. The best red port, on the red port of the speakers, should be consistent, a speaker connected to the wrong, or the wrong position, it will completely destroy the stereo effect.