* Some CD players can only play music (burned or bought) in audio format whereas some can play CDs with MP3s burned on them.
** If you burn a lot of CDs, make sure your player can read them.
** A CD-R/RW can hold a lot more when burned with MP3s than with audio files.
* '''SignalNoise''' ratio measures how much floor noise there is with a player. A high number signifies that there's not much noise beside that newfangled junk you call music.
* '''D/A Converters''' change the digital music into an analog audio signal.
* '''Connection Cables'''
** '''Analog''' cables connect with wires labeled "left" and "right" to your speakers. They're the default and the lowest quality.
** '''Coaxial Digital Input/Output''' converts a digital signal into an analog one for the speakers.
*** While it looks like most RCA jacks, make sure the cable is designed for digital signals.
** '''TOSLINK/Optical Line''' cables are the cleanest sound for about $20.
* '''Frequency Response/Range''' tells you the frequency range that the player can transmit reliably.
** This is audio equivalent of knowing how many colors your TV can project.
** Typical people with undamaged hearing can hear 20Hz - 20 kHz.
*** If your player has a range larger than that, you're just showing off.
* By now, most players will have the typical "shuffle," "repeat," and "skip" buttons that originally set CDs apart. Have a blast.