![]() ![]() Audio engineers using CD players to play music for an event through a sound reinforcement system use professional audio-grade CD players. DJs playing dance music at clubs often use specialized players with an adjustable playback speed to alter the pitch and tempo of the music. Modern units can play audio formats other than the original CD PCM audio coding, such as MP3, AAC and WMA. ![]() To listen to music using a CD player with a headphone output jack, the user plugs headphones or earphones into the headphone jack. To use a CD player in a home stereo system, the user connects an RCA cable from the RCA jacks to a hi-fi (or other amplifier) and loudspeakers for listening to music. Most CD players produce an output signal via a headphone jack or RCA jacks. CD players may be part of home stereo systems, car audio systems, personal computers, or portable CD players such as CD boomboxes. CDs typically contain recordings of audio material such as music or audiobooks. CD players were first sold to consumers in 1982. A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format.
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