A stereo component (receiver, integrated amplifier or separate components) is the heart and brains of a stereo system. It is the point where all source components are connected, it powers the loudspeakers and controls the entire system, so it's important to select the right features for your system. If price was not important, we would all buy separate components, but good, even great audio performance is possible with a moderately priced receiver and a well-matched pair of speakers. Start by reading this
overview of stereo components to learn the advantages of each type of stereo component. Once you've decided on a receiver, integrated amp or separates, consider power output which is determined by the speakers in your system.