The amplifier is the beating heart of most hi-fi systems, supplying the power that makes your speakers sing. A mainstay of every hi-fi system since the earliest days of Rock n' Roll, modern hi-fi amplifiers come in many types, from ultra compact designs to huge powerhouses. With additional features such as wi-fi, digital inputs, streaming compatibility, and even built in pre-amplifiers for your turntable, there's a whole world of amplifiers to discover.