Suitable for high-resolution Audio

Pro-Ject Stream Box RS  

Highend audio streamer, internet radio & D/A converter  


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open page Specifications       PDF Productinfo [pdf, 834 KB]       PDF User Manual [pdf, 1260 KB]       
PDF Review 1 [pdf, 225 KB] PDF Review 2 [pdf, 279 KB]

Box Control: full control of Stream Box  



• 24 bit/192kHz Hires Audio streaming client  

Spotify Connect support (firmware or higher)  

LOSSLESS-Streaming with TIDAL  

XLR & RCA output  

Volume control via analogue alps potentiometer  

Fully balanced double mono triode tube output stage  

• Top of the notch Highend PCM 1792A DAC  

• WAV, AIFF, FLAC, WMA9 lossless, ALAC & AAC  

• FLAC decoding for all 9 compression levels including Level 0  

(data rate up to approximately 9 mbit/s)  

1x digital coax & 1x digital poptic inputs  

• Gapless playback of all audio formats  

• Fixed analogue & digital coax outputs (RCA)  

• Search functionality fast forward back & alphanumeric  

• 3,5“ colour display shows cover art and metadata  

• Multiple display languages  

• Wifi 802.11 b/g allowing real 24/192 over Wifi  

Superlative rigid luxury alu cabinet  

• Special proprietary NetAPI implemented for fast access  

• Free Control APP (iOS & Android)  



Stream Box RS is Pro-Ject Audio‘s reference-class audio streamer, that goes far beyond the AWARD WINNING audiophile grade highend audio streaming client Stream Box DSnet, Ready for use with streaming service Spotify and LOSSLESS audio music platform TIDAL. Other streaming services like Deezer, Grooveshark etc, can be implemented using 3rd party applications. Additional to the streaming functionality. Stream Box RS also acts as D/A converter for other digital sources, that use USB, coax and optical connection and as highend pre-amplifier with 1 additional analogue sound source! The audio circuitry is using E88CC tubes for ultimate fidelity and components, that guarantee extremely low noise and distortion levels. Volume control is done by a motor-driven ultra highend ALPS potentiometer via IR remote and/or the new and advanced Android or iOS Apps.  


SRP: € 1.499,00  



Recommended accessories:  



Control it DS/RS


Sound optimization:  


The addition of linear power supply Power Box RS Uni 1-way (SRP € 399,00) or Power Box RS Uni 4-way
(SRP € 599,00) adds even more depth and lets you hear all microscopic fine detail.  

Power Box RS Uni 1-way

Power Box RS Uni 4-way

CAUTION: Please check the power connection of your Stream Box RS on the rear side. In case of an 18V 2.5 connection, a Connect It Power MiniXLR 18V 2.5 adapter cable is necessary to power the unit with a Power Box!  



Optional upgrades:  

Airplay upgrade (by adding Airport Express)  

Bluetooth upgrade € 79,00 (incl. premium optical cable)  



Stream Box supports TIDAL - Quick Start Guide (10/2015)  

Stream Box - Firmware Update (06/2015)  

Stream Box - Firmware Update (06/2015)  

Spotify Connect Quick Start Guide  

Box Control App for iOS & Android 1.0 FINAL now available! (07/2013)  

Box Control App for Android  

Stream Box: FLAC and other PC audio miracles  

Box Control: Android- and iOS-App special for Stream Box!  

Stream Box: tips for best performance  



04.09.2015: New Firmware Version available!  

You can update the Firmware at "Settings" - "General" - "Software Update".  

Firmware History  



Stream Box RS multiroom application  

Combine several Stream Box RS to a multiroom audio system with Windows Media Player 12 (Windows 7 PC)!  

Audiophile playback because of Stream Box RS.  

In each zone different music at the same time!  

detailed Information for Download  


Stream music from Smartphone to Stream Box RS  

„iMediashare“ makes it possible to transfer your music directly from Smartphone to Stream Box RS!  

detailed Information for Download  

Note: iOS version is not working correctly with Stream Box RS. When selecting music from iTunes library, App crashes and shows abnormal end. iMediaShare is informed and is working on a solution. As an alternative, it is possible to stream audio from iPod/iPhone/iPad using newest version of Plug-Player Version (4.1.0), which is also able to send music to Stream Box RS. Android version of iMediaShare is not affected and works perfectly!  



FAQ - Hints for using Stream Box RS  


Q: What has to be considered when using TIDAL with the Stream Box?  

A: To use TIDAL music service a TIDAL Hifi or TIDAL Premium account is required. Install the latest version of the Box Control App and update the firmware of your Stream Box.  


Q: The TIDAL Setup does not work and returns Country: Bad Login, what can I do?  

A: Please avoid the percent symbol (%) in your password.  


Q: What has to be considered when using Spotify Connect with the Stream Box?  

A: To use Spotify Connect a Spotify premium account of Spotify is necessary. A free Spotify account does not support Spotify Connect. Install the latest free firmware for the Stream Box.  


Q: Why are Bluetooth and Airplay functionalities not part of Stream Boxes and only available as optional upgrades?  

A: Stream Box DSA, DS+ und RS are unique products, because they offer inputs for additional signal sources which are not available with almost all other streamers.  

Only a small part of customers needs Bluetooth and Airplay (by adding Airport Express) functionality. If these functions would be integrated in our Stream Boxes, a 20-30% price increase would be the consequence for all consumers, even if they do not use Bluetooth or Airplay. So we offer optional Airplay and Bluetooth upgrades for those who want to implement these recent features, following our philosophy and approach for high-class sound quality with long-term and future-proof reliability.  


Q: Why can't i see my Favorites under Internet-Radio and why can't i generate a new Access Code? Why i get "empty" or "Server Error" when i browse Radio Stations?  

A: Some Internet Provider have slow DNS-Servers and therefore you get a timeout when you want to access vTuner. Change the DNS-Server of your Internet-Router to an alternative free DNS-Server (eg. and This DNS-Servers are provided by Google and are very fast.  


Q: What is the maximum size of a hard disk connected on the USB-Port of the Stream Box?  

A: The maximum size of a hard disk (or USB-Stick) connected on the USB-Port of the Streamer can be up to 8 Terabyte. A single music file cannot be larger than 4 Gigabyte.  


Q: I cannot see my Windows-PC under Media Server.  

A: Make sure that media sharing in Windows Media Player is enabled.  

Go to “Streaming” – “Turn on media streaming” (Windows 7) or “Library” – “Media Sharing”.  


Q: The USB hard disk or storage media is not recognized by the Stream Box RS.  

A: Check whether it is formatted FAT32 and not exFAT or NTFS.  

With a larger Storage than 32GB you need a special tool to format it as FAT32 (eg. Fat32Formatter).  


Q: How can I update the Firmware?  

A: From the main menu of the Stream Box RS choose "Settings" - "General" - "Software Update".  


Q: Why does not support the Stream Box NTFS?  

A: FAT32 is the standard filesystem for all music players, digital cams, printers etc. and therefore the best compatible filesystem for all devices. NTFS support more features e.g. security info and therefore it can make troubles. FAT32 has no disadvantages compared to NTFS which are relevant in the audio world.  


Q: What is to consider to use GAPLESS?  

A: The GAPLESS playback between 2 tracks works when the music is played from an USB storage device.  

If the music is played from an UPnP Server (eg. Twonky) GAPLESS only works with the remote control or with our Box Control App over NetAPI.  

With a normal UPnP-Control-App (eg. PlugPlayer) GAPLESS is not possible.  


Q: What is necessary to play FLAC files with 24Bit/192KHz without interruptions?  

A: For music files with high data rates (even WAV files) a LAN connection is necessary because WiFi-G has too less bandwidth.  

Further necessary is a powerful NAS-System or a fast USB storage.  

Avoid retranscoding music by the server, because this can also cause dropouts.  


Q: What is to consider at the Router?  

A: You can use either wireless (WLAN) or wired (LAN) connection, but by principle LAN connections are more reliable than WLAN.  

If wireless is your choice, use at least Wifi „G“ or mixed “G/N”routers and channels 1 to 11. If you face speed problems on specific channels, switch to another.  


Q: What routers and switches are recommended for use?  

A: Our App and Stream Boxes are designed for advanced gigabit routers and switches to guarantee best possible datatransfers and communications, therefore they are recommended for optimum performance and results. A well set up network and server (avoid high datasets) are prerequisite for best results. Also it is recommended to connect the Stream Box via Ethernet cable into the network, since that guarantees maximum stability.  


Q: What is to consider at the UPnP/DLNA-Server?  

A: Twonky media server or Asset UPnP will give perfect results. Many DLNA servers can be enabled for transcoding of the original signal to another file format. This changes the integrity of original signal and requires a lot of processing power in NAS systems.  

Transcoding may lead to drop-outs in playback, so please make sure transcoding is not enabled!  


Q: What is to consider at the NAS (Network Attached Storage)?  

A: Main CPU of network attached storage device should have at least 1GHz for playback of HD music without dropouts (QNAP-NAS consistently have reliable quality with Twonky pre-installed).  


Q: What is to consider at Audio Playback and Ripping Formats?  

A: HD music files (24 bit/88,2 - 192kHz) have audio quality like in the recording studio and are available from diverse online sources.  

Second best are uncompressed file formats created from CD source. WAV is a 1:1 copy of CD‘s audio with best sound quality, but no tag information or album art will be displayed. Lossless audio formats like FLAC & ALAC offer the same audio quality as WAV, but need only 60% of hard-disk space and show album art plus track/artist information.  

PLEASE NOTE: FLAC offers 8 levels of lossless compression, levels 4 to 8 give best results. With compression levels 1 to 3 you will get NO playback, because of excessively high data rates (please use WAV instead)! Please also make sure that album cover art graphic is smaller than 800kbyte, bigger files will not be displayed! ALAC does need Twonky or Asset UPnP as server for playback. Please avoid lossy compressed file formats, like MP3 or AAC, if you are forced to use these, select highest bitrate (320 kbit/sec) to get playback quality near CD. All suggested ripping formats (except WAV) are able to display cover art and metadata, if these information is available from online data base (CDDB, Gracenote,…), when ripping.  


Q: What is to consider at the CD Ripping Software?  

A: We strongly recommend to use high quality ripping programs and the best available audio formats to store music onto computer or network. There are many different programs for download, which can be used as ripping and playback software (iTunes, Windows media player, foobar2000, EAC…). If you want to be sure to get a bit-perfect copy, please activate “Ripping Security” in foobar2000, dBpoweramp or Exact Audio Copy (EAC).  


Q: What is to consider at Home Recordings from analogue sources?  

A: If you record your own files from vinyl or analogue tape, you are able to transfer the original quality by using 24bit depth and higher sampling rate (96 to 192kHz). High quality recording software needs not to be expensive, we recommend Audacity combined with high quality audio interface like Phono Box USB V.  


Q: Is it possible to play WAV- or M4a-Files?  

A: WAV-Files (Fileextension .wav) or MPEG-4 Audio (Fileextension .m4a) are container formats and can be played. WAV-Files contains LPCM-Audio files and M4a-Files can contain AAC- and ALAC audio files.  


Q: The Volume Control with the Box Control App does not work properly or i can only lower the volume.  

A: Please deinstall the Box Control App and install the latest version from the store.  



Firmware History:



• Providing embedded album art and album art from iPod via NetAPI  

• Track ends not cut anymore when using external control points  

• Implemented setNextAvTransportUri  

• Some optimizations of ALAC playback  



• Fixed a problem with FLAC-files with big cover arts  

• Optimized FF/FB over NetAPI  

• Improved volume handling process  

• Further small bug fixes and optimizations  



• Improved support for AAC-files with 96KHz  

• Extension of the NetAPI-Commands  



• Implemented improved support for high bitrate FLAC192/24 files (up to level Zero)  

• Implemented network optimizations for higher throughput in Gigabit environments  

• Increased amount of available memory and processor power while playback for ultimate performance  

• Aligned playback progress bar with better resolution and increased size of album art  

• Bigger album art in play view (no mirror effect)  

• Fixed playback issue with AIFF- & WAV-Files controlled via UPnP  



• Spotify Connect support  



• Bug fix of search function  

• Stability improvements when using Spotify and UPnP  





Pro-Ject Audio Systems has no influence on the mentioned third-party software (e.g. Jamcast, PlugPlayer) and therefore cannot guarantee a proper operating of this software. The use of this third-party software is at your own risk, although we recommend it. Liability claims have to be asserted at the third-party software manufacturer, Pro-Ject Audio Systems disclaims all liability in this regard.  


Last update 18.07.2018

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