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An MP3-compatible in dash CD receiver with USB and SD memory card ports and a front panel aux input offered by Boss Audio.

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unique, slick design that has a high-end kind of look

1 agrees

radio reception is above average, can pick out stations from a long way away

1 agrees

ESP is very good, rarely if ever skips even burned CDs

1 agrees

reads from the USB port and SD card quickly, plays everything

1 agrees
  • Only 3 words are allowed.

ring around the volume knob flashes different colors, very distracting at night

1 agrees

no instructions for how to change the display color, although documentation says its possible

1 agrees

clock isn't visible unless you push a button on the remote

1 agrees

no dimmer switch, very bright at night

1 agrees

bass response is poor, even when connected to an external amp it's quiet and distorted

1 agrees

takes about 30 seconds to load any CD

1 agrees
  • Only 3 words are allowed.


The Boss 639UA is an MP3-compatible in dash CD receiver with USB and SD memory card ports and a front panel aux input offered by Boss Audio. It has a fully detachable drop down panel which features an oversized black mask display and ColorSpectrum backlighting.  It can play MP3 files directly from the built in USB slot or SD memory card port with ID3-Tag capabilities, and also has a front AUX input to easily enjoy music off any portable audio player using a standard headphone jack. The CD player can play CD, MP3, CD-R and CD-RW discs, has ESP anti-skip and is also compatible with ID3-Tag display so you can see the name of the song/artist you are listening to. There is also a built in PLL synthesizer tuner with 24 station presets.  To control the output sound, bass and treble are seperated and there are balance and fader controls and stereo/mono and local/distance switches. It has RCA outputs and gives 60 watts of power to each 4 channel output. The Boss 639UA comes with a wireless remote control for easy operation and is also sold as the RDS639UA which is the European frequency model.

  • ISO DIN mounting
  • Full detachable drop-down front panel
  • Oversized, active black mask display
  • ColorSpectrum backlighting: Continuously cycle through the color spectrum or stop on the illumination color of your choice.   
  • Illuminated control buttons
  • PLL synthesized tuner
  • 24 Station presets
  • Switchable USA/Europe radio frequencies
  • USB port
  • SD Memory Card port
  • Front panel auxiliary input
  • Compatible with audio output of iPod and other MP3 players
  • Quartz digital clock
  • CD mute function
  • Track repeat • Intro scan
  • 1 Bit D/A converter • 8X oversampling
  • ESP (anti-skip mechanism)
  • MP3/CD-R/CD-RW compatible
  • ID3-Tag display
  • Separate bass and treble
  • Balance and fader controls
  • RCA outputs
  • Loudness
  • Stereo/mono & local/distance switches
  • Wireless remote control
  • Output power: 60W x 4 channels
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