Question: Astell&Kern, is a South Korean consumer electronics company founded in October 2013, and is wholly owned by Iriver, the company manufactures media players, CD players, headphones, and which type, that refers to home entertainment audio-visual systems that seek to reproduce a movie theater experience and mood using consumer electronics-grade video and audio equipment that is set up in a room or backyard of a private home?

<P0-S0> Astell&Kern (stylized as Astell Kern) is a South Korean consumer electronics company founded in October 2013, and is wholly owned by Iriver. <P0-S1>  The company manufactures media players, CD players, headphones, and home theater products. <SEP> <P1-S0> Professional audio, abbreviated as pro audio, refers to both an activity and a category of high quality, studio-grade audio equipment. <P1-S1>  Typically it encompasses sound recording, sound reinforcement system setup and audio mixing, and studio music production by trained sound engineers, audio engineers, record producers, and audio technicians who work in live event support and recording using audio mixers, recording equipment and sound reinforcement systems. <P1-S2>  In contrast, consumer audio equipment is a lower grade of gear which is used by regular people for the reproduction of sound in a private home on a home stereo or home cinema system. <SEP> <P2-S0> A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format. <P2-S1>  CD players were first sold to consumers in 1982. <P2-S2>  CDs typically contain recordings of audio material such as music. <P2-S3>  CD players are often a part of home stereo systems, car audio systems, and personal computers. With the exception of CD boomboxes, most CD players do not produce sound by themselves. <P2-S4>  Most CD players only produce an output signal via a headphone jack and/or RCA jacks. <P2-S5>  To listen to music using a CD player with a headphone output jack, the user plugs headphones or earphones into the headphone jack. <P2-S6>  To use a CD player in a home stereo system, the user connects an RCA cable to the RCA jacks or other outputs and connects it to a hi-fi (or other amplifier) and loudspeakers for listening to music. <P2-S7>  They are also manufactured as portable devices, which are battery powered and typically used with headphones. <SEP> <P3-S0> Home cinema, also called home theater or home theatre, refers to home entertainment audio-visual systems that seek to reproduce a movie theater experience and mood using consumer electronics-grade video and audio equipment that is set up in a room or backyard of a private home. <P3-S1>  In the 1980s, home cinemas typically consisted of a movie pre-recorded on a LaserDisc or VHS tape; a LaserDisc or VHS player; and a heavy, bulky large-screen cathode ray tube TV set. <P3-S2>  In the 2000s, technological innovations in sound systems, video player equipment and TV screens and video projectors have changed the equipment used in home theatre set-ups and enabled home users to experience a higher-resolution screen image, improved sound quality and components that offer users more options (e.g., many of the more expensive Blu-ray players in 2016 can also "stream" movies and TV shows over the Internet using subscription services such as Netflix). <P3-S3>  The development of Internet-based subscription services means that 2016-era home theatre users do not have to commute to a video rental store as was common in the 1980s and 1990s (nevertheless, some movie enthusiasts buy DVD or Blu-ray discs of their favourite content).