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Pro-Ject CD Box S2

Compact single-disc CD player (Silver)

Item # 252CDS2S

This low-profile player offers pristine sound, thanks to a very accurate built-in digital-to-analog converter.

This low-profile player offers pristine sound, thanks to a very accurate built-in digital-to-analog converter.

Discontinued item
2 questions - 3 answers

Item # 252CDS2S

About the Pro-Ject CD Box S2

A space-saving CD player

If you want to listen to your prized CD collection, but have limited room for new components, the Pro-Ject CD Box S2 may just be the ideal solution. This low-profile CD player offers hi-fi audio quality, with a built-in 32-bit/384kHz digital-to-analog converter for highly accurate playback. If you happen to have plenty of room, and prefer to use a separate component DAC, there's a Toslink optical digital output on the back. 

Product highlights:

  • plays CD, CD-R, CD-RW and Hybrid-SACD
  • 32-bit/384kHz DAC for highly accurate playback
  • frequency response: 20-20,000 Hz (-0.15 dB)
  • selectable digital filters let you fine-tune the sound according to taste
    • FIR (finite impulse response)
    • IIR (infinite impulse response)
  • all-aluminum case reduces vibration and interference
  • Toslink optical digital output
  • stereo RCA analog output
  • remote included
  • external AC power supply included
Dimensions and warranty:

What's in the box:

  • CD player
  • AC power adapter (attached 46" DC cord)
  • 3 AC plugs (US/EU/UK)
  • Remote control
  • CR2032 3V battery
  • Instructions For Use

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More details on the Pro-Ject CD Box S2

Stacey B.

Product Research


CD Box S2: The Pro-Ject CD Box S2 is a compact single-disc CD player for high-quality CD audio playback. Its ultra-compact and features a carefully manufactured, high-quality all-aluminum case and buttons that resists vibration and interference. The CD Box S2 is available in Black or Silver.

Compatible Discs: The CD Box S2 features a slot-in mechanism for CD playback. It supports playback of CD audio music files on a CD, CD-R, CD-RW, or Hybrid SACD disc. This unit only supports CD audio music files.

  • This unit does not support playback of compressed music files such as MP3, WMA, AAC, etc.
  • This unit does not support playback of high resolution music files such as FLAC, ALAC, DSD, etc.
  • This unit does not support playback of the Super Audio CD layer on a Hybrid SACD disc.

Note: It takes approximately 35 seconds for the CD Box S2 to power on and start up.

1:1 Bit-Accurate Drive: The disc drive in the CD Box S2 enables 1:1 bit-accurate CD audio play­back. Compared to its predecessor, the CD Box S, the inner workings of the CD Box S2 have been technically revised. The player is controlled by a mini-computer, to optimize its PC-drive for a 1:1 bit-accurate reading of the "Redbook" CD-standard. The CD is read into a memory allowing any reading errors to be corrected, which ensures the best sound quality that you can get from a PC-drive. Although this approach results in slightly higher start-up and reading times, it enables Pro-Ject to fit an audiophile-grade CD player into and ultra-compact case.

Advanced 32-Bit/384kHz DAC: A new and advanced 32-bit/384kHz DAC (PCM5102A) by Texas Instruments enables a more precise and detailed digital-to-analog conversion. A new feature is the ability to switch between digital IIR and FIR filters. FIR filters are more complex DSP-operations and require more computational effort. However, they enable a finer and linear processing of the digital signal.

Analog & Digital Outputs: The Pro-Ject CD Box S2 is outfitted with analog and digital outputs. The analog stereo RCA outputs utilize connect to your home receiver or integrated amplifier and utilize the CD Box S2's built-in DAC. The optical (toslink) digital output can feed an external DAC, letting your high-end DAC convert the accurately transferred bitstream from the CD.

Front-Panel & Remote Control: The CD Box S2 offers front-panel controls and comes with an IR remote. On the front-panel five aluminum push-buttons that operate Power On/Off, Play/Pause, Stop, Previous/Next Track, and Eject. The IR remote operates the same functions (except Eject) as the front-panel controls, but also adds a numeric keypad for direct track access, Repeat of current or all tracks, Fast Forward/Reverse within a track, and volume control adjustment for Pro-Ject integrated amplifiers.

Front-Panel Display: The Pro-Ject CD Box S2 features small front-panel display which indicates track number and elapsed time of a track during playback. When a disc is first inserted, the display indicates total number of tracks and total playback time on disc. The unit does not offer CD Text or song/artist/album information display.

AC Power Adapter: The Pro-Ject CD Box S2 comes with an external AC power adapter that plugs into the back of the CD player and into an AC wall outlet or surge protector (sold separately - see Accessories Tab).

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Customer Q&A

2 questions already asked

When it says hybrid-sacd cds does it mean sacd so can I utilized the better sound quality on non hybrid sacds?
[ Jeff  Jun 28, 2020 ]
1 answer
No, a hybrid-SACD has a CD layer that the Pro-Ject S2 will play, but it will not play the SACD layer. It is strictly a CD player only.
[ Lee  Jun 28, 2020 ]
I'm curious. This New Pro-Ject CD Box S2 has a remarkable 32-bit/384kHz DAC, but the CDs it plays are encoded as 44.1Khz, so why the need and what is the advantage of having a super DAC in a CD player that will not utilize it beyond 44.1?
[ Jerry  Aug 19, 2020 ]
2 answers
The reason for using a DAC that has twice the bit depth and over 8 times the sampling frequency needed to read the file is keep the DAC's limits from being reached causing bad sound at those limits, and also so there is processing power allowing FIR filters to also be used for even better sound than only being able to use digital IIR filters
[ Paul  Aug 30, 2020 ]  Staff
I have been nothing but happy with this Pro-Ject CD player and I offer this answer from a user prospective and not a technical explanation. When I first received it I compared playing CDs thru its' built in " super DAC" to my digital ready preamplifiers' built in DAC. The Pro-Ject CD player gave a larger more transparent sound with use of its' built in DAC. Now I have recently acquired a stand alone outboard DAC (SMSL M400). I now use my Pro-Ject CD player as a transport ( it reads the CD and passes the digital output) to my SMSL DAC. The Pro-Jects' reading produces a very pure jitter free digital signal input. Hope this helps.
[ CHESTER  Aug 29, 2020 ]

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