Wireless Preamplifier S50 Pro+

S50 Pro+ is a WiFi and Bluetooth 5.0 stereo preamplifier that uses ESS Sabre DAC and with OLED display.  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

aptX HD Audio

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.

ESS Sabre DAC

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.

ess
OLED display panel

OLED Display Panel

S50 Pro+ comes with a OLED display panel that can show the current input mode, song name, volume level, treble and bass level.

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.

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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

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.

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Specification

Interfaces
DC input: Micro USB 12V/1A
Analog audio input:
  -RCA for analog input
Digital audio input:
  -Optical SPDIF output
Analog audio output:
  -RCA for analog output
  -Subwoofer 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 indicator: RED - Standby mode
OLED Display Panel: Display status info
Reset: short press to reset the WiFi, long press to restore factory setting
IR receiever: for remote control
Antennas for WiFi and Bluetooth

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

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

Audio Parameters
Music format:
  FLAC/MP3/AAC/AAC+/ALAC/APE/WAV
Audio decode: 24bit, 192kHz
Frequency response: 20Hz-20kHz
THD+N: 0.03% 
SNR:110dB
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, SPDIF Optical for digital input

General
Power input: 12V/1A input
Dimensions: 120*113*37mm
Weight: 0.4kg
Working temperature: 0~40℃

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