Hi-Fi components refer to the components of a high-fidelity sound system. The two solutions for this term are AMPS (4 letters) and TUNERS (6 letters). An amplifier, or amp, is an electronic device that increases the power of a signal. It is used to increase the volume of audio signals, such as music or speech. A tuner is an electronic device that receives radio signals and converts them into audio signals. It is used to tune in to radio stations and other audio sources. Together, these two components form the basis of a Hi-Fi sound system.