-What is a Hi-Fi system?
A Hi-Fi system is usually defined as a stereo system consisting of two identical loudspeakers and a playback device. Home cinema systems consist of at least six speakers (5.1) and reproduce surround sound. Home cinema systems require a precise balance between receiver cut-off frequency and speaker characteristics.
Home stereo systems may not be as popular as they used to be 10 or 20 years ago but they are still here and the market has a lot to offer. Today's home stereo systems have all the features you would expect from a modern audio device. They have Bluetooth, USB ports for music playback, AM and FM radio tuners, CD players.
A high-fidelity sound system meets subjective standards and reproduces sound accurately. A high-definition audio system supports the latest digital audio formats and creates an immersive experience. The two are related, but aren't interchangeable.