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Your inquiry is appreciated. Without sounding condescending or insulting on this topic, the term HiFi Audio is a term that home audio enthusiasts or audiophiles used to distinguish high quality audio reproduction from poorer quality sound produced by inexpensive audio equipment, or the inferior quality of sound reproduction characteristic of recordings made until the late 1940s. The term could apply to the LG - Soundbar with Wireless Subwoofer, Model # LAS551H is some ways given the definition of HiFi Audio. The LAS551H receives audio from various devices in a number of different ways. You can send audio via Bluetooth, which although is a lossy audio protocol, meaning that some of the data is lost due to compression, is a digital format which means that the audio reproduction in the Soundbar is bit-exact the same data that was transmitted. This brings up the old argument of analog having a warmer sound because all the harmonics of the original recording are present versus that of the digital format not being as warm due to the fact that data encoded to a digital format is compressed in a way that loses some of the source data. However, ideally, high-fidelity equipment has minimal amounts of noise and distortion and an accurate frequency response and the digital format is just that because it is less prone to interruption, due to buffering, which means that you are unlikely to notice even if some other electromagnetic frequency transmission interferes with your Bluetooth. You also have HDMI and Optical Digital (Toslink) inputs that are uncompressed 5.1 digital signals which are common in some modern hi-fi equipment that use these connections. This unit is supports playback of FLAC files (up to 192kHz) and the OGG FLAC (up to 48kHZ) which are lossless formats (CD quality). Then last but not least, the unit also has a standard 3.5mm headphone jack (technically called a TRS connector) which can be a very high analog audio quality if the device you're using for playback has a high quality DAC in it. So what will determine if this unit qualifies as a HIFi device will depend on what devices you're using as playback devices. What you put in is what you get out. It is capable of being a HiFi device based on that...^IFV
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