A two-channel amplifier is an one that can operate two channels. It is basically two one-channel amplifiers in a single box. As every channel is the power combination intended for one specific speaker, two-channel amplifier is usually intended for operating a left and a right speaker, A bridged two-channel amplifier is constructed in such a way that the amplifiers can be set up to operate inline, providing the effect of a more powerful one-channel amplifier. The two-channel amplifier will send the signal from the left RCA audio cable to one channel and the signal from the right to the other channel.