The amplifier is the beating heart of your hi-fi system, supplying the power that makes music rock. They amplify signals from sources like CD players, turntables and streamers and drive connected speakers. Amplifiers come in many forms, from separate pre-amplifiers and power amplifiers to integrated amplifiers, which combine a pre- and power amplifier in a single box. The latter is a popular choice among hi-fi buyers, as they deliver the best balance of performance, price and convenience. Other types include phono preamplifiers and stereo receivers (which come with built-in DAB or FM tuners) AV receivers are a type of amplifier primarily designed for multichannel home cinema use, equipped with built-in radio tuners.