Wireless Preamplifier S50 Pro

S50 Pro is a WiFi and Bluetooth 5.0 stereo preamplifier that uses ESS Sabre DAC and AKM ADC.  It can decode upto 24bit 192Khz audio, support Airplay, DLNA and UPnP. You can stream music from your mobile phone, NAS, online music services like Spotify, Tidal, Qobuz, Pandora and more. With multiple devices, you can form a multiroom audio system in your network.

aptX HD Audio

aptx hd

aptX HD is an enhanced codec which supports 24 bit music quality over bluetooth transmission and is engineered to improve the signal to noise ratio, resulting in lower background noise, to help you get the very most from your music. It is designed to answer the growing demand for high definition audio.


S50 pro build with the famous ESS Sabre DAC, which is powered by the industry proven Sabre DAC technology, it combines the best sounding audio with lowest system cost and highest perfromance into the ideal D/A converter for audio receiver. With ESS Hyperstream architecture and Time Domain Jitter Eliminator, it delivers jitter-free studio quality aduio to you.




Using the AKM ADC which is a high performance 24 bit stereo A/D converter for digital audio system, S50 Pro can let you input analog signal from audio equipment like CD Player, DVD Players or Vintage record player and transfer it to digital signal so you can apply EQ effects to the audio.

Wireless Connection

S50 Pro supports 2.4G WiFi and Bluetooth 5.0 wireless conneciton. It also supports Airplay, DLNA & UPnP protocols. You can easily stream music wirelessly form your mobile, PC or NAS in your local network.

wireless logo

Online Music Services

Online Music Services

S50 Pro supports many famous online music services like Sportify, Deezer, Tidal, Amazon Music, Qobuz, Napstar, iHeartradio, Internet Radio and QQ Music. You can easily stream your favorite music from the music service provider you usually use.

Lossless Audio Format

S50 Pro can decode upto 24bit / 192kHz audio and supports various lossless audio format, including FLAC / MP3 / AAC / AAC+ / ALAC / APE / WAV.

lossless aduio

Multiroom / Multizone


With multiple devies in different room, you can easily group them in different group and stream music to the master device which will sync the same music to other devices in the same group.

4Stream Applicaiton

4Stream application is our mobile application for both Android and iOS. You can easily control all the Rakoit devices in your house whether you want to play muisc from your phone or PC, play seperate music in each device or same music for all devices.



DC input: Micro USB 5V/1A
Analog audio input:
  -RCA x2 for analog input
Analog audio output:
  -RCA x1 for analog output
Digital audio output:
  -Optical SPDIF output
  -Coaxial SPDIF output
USB host: to connect USB pen drive
Ethernet RJ45: for wired LAN cable to connect internet
LED indicators: to show the device status
Reset: short press to reset the WiFi, long press to restore factory setting
IR receiever: for remote control
Antennas for WiFi and Bluetooth

Streaming Protocols
AirPlay, DLNA, UPnP, Spotify connect and Qplay

Wireless connection:
  - IEEE 802.11 b/g/n 2.4G
  - Bluetooth 5.0
Wired connection :
  - Ethernet RJ45

Audio Parameters
Music format:
Audio decode: 24bit, 192kHz
Frequency response: 20Hz-20kHz
THD+N: 0.03% 
Bluetooth: aptX HD, BT distance: 10M

Control Applications
4STREAM for iOS and Android based smart devices
iTunes for MAC and Windows PC
Foobar2000 and other compatible third-party apps

Music Sources
Online streaming services:
Spotify, Deezer, TuneIn, Tidal, Qobuz, Napster, iHeartRadio, more coming in the near future
Local storage:
Music stored on the mobile device memory, NAS, USB pen drive
Aux input:
RCA for analog input

Power input: 5V/1A input
Dimensions: 114.7*107.5*37mm
Weight: 0.4kg
Working temperature: 0~40℃

Scroll to Top