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The Sonifex S1

The S1 by Sonifex

The S1 has an amazing feature set and offers a proper broadcast solution to community, educational and student radio stations that need a versatile, reliable radio broadcast mixer. It has a ‘no compromise on quality’ approach with excellent mic amps, comprehensive facilities & simple, reliable operation.

It can be fitted flush into a desk-top or can be rack-mounted by the addition of optional rack ears.

The rear connectivity panel can be rotated 90˚ onto the base of the unit providing easier connection to the unit when it is rack-mounted. It has an integral universal switch mode power supply, which uses an IEC inlet.

It maintains the same front panel ease of use found on the Sonifex S2 whilst providing advanced automated features not seen on any other product currently available on the market.

The console consists of ten input channels:

  • 2 x mono XLR mic/mono XLR line inputs.
  • 1 x mono XLR mic/mono XLR telco input.
  • 2 x mono XLR mic/mono XLR line inputs/ stereo ¼” jack unbalanced line input.
  • 1 x stereo XLR line/stereo XLR cleanfeed input.
  • 2 x stereo XLR line/stereo RCA inputs, one with a 3.5mm stereo aux input.
  • 2 x stereo XLR line/stereo SPDIF & Toslink digital inputs.

Providing in total 5 mic, 4 mono line, 10 stereo analogue, 2 stereo digital, 1 telco & 1 stereo cleanfeed inputs which you can switch between.

Part Number: S1

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Key features include:

  • High performance, ultra-reliable on-air radio mixer.
  • Low cost.
  • Easy to use.
  • Small footprint, flush-mounting or rack-mounting.
  • Analogue & digital inputs & outputs.
  • Main stereo output buss plus 2 Aux output busses, pre or post fader selectable.
  • Rotating rear panel for ease of installation.
  • Integrated power supply.
  • Remote outputs per channel.
  • Fader start of ancilliary equipment such as CD players.
  • Programmable general purpose I/O.
  • Monitor muting on mic live.
  • Mic-live/on-air sign switching.
  • Monitor outputs for presenter & guest headphones, & speakers.
  • Bright LED meter display PPM/VU selectable with separate meterbridge output.
  • 100mm ALPS long-throw faders with control via VCAs.
  • Separate telco & stereo cleanfeed o/ps for use with a telephone hybrid & codec respectively.
  • Advanced automation facilities.
  • Remote control via free SCi software.

Input / Output Impedances

Mic Input: > 1k5Ω electronically balanced
Mono Line Input: > 20kΩ electronically balanced
Stereo Line Input: > 20kΩ electronically balanced
PGM Output: < 50Ω electronically balanced
Monitor Outputs: < 75Ω unbalanced
AES Input/Output: 110Ω
S/PDIF Input/Output: 75Ω
BNC Wordclock Input: 50Ω

Input / Output Gain Range

Mic Input: Preset pot +21dB to +64dB ref -50dBu, TRIM pot ± 12dB
Mono Line Input: Switch 0dB to +10dB ref 0dBu, TRIM pot ± 12dB
Stereo Line Input: Switch 0dB to +10dB ref 0dBu, TRIM pot ± 12dB
Telco Input: Switch 0dB to +10dB ref 0dBu, 
TRIM pot ± 12dB 
Stereo Cleanfeed Input: Switch 0dB to +10dB ref 0dBu, TRIM pot ± 12dB
Digital Input: 0dBFS = +18dBu on input; TRIM pot ± 12dB allowing 0dBu to +24dBu
Digital Output: 0dBFS = +18dBu

Frequency Response

Mic Input: 40Hz to 20kHz –1dB, +0dB
Line Inputs: 20Hz to 20kHz –0.5dB, +0dB
RCA Inputs: 20Hz to 20kHz –0.5dB, +0dB

Noise (20Hz to 20kHz)

Mic Input E.I.N.: -130dB with 150Ω source.
Stereo Inputs -92dBu ref 0dB (fader down, no routing)
-91dBu (fader down, one channel routed)
-86 dBu (unity gain, one channel routed) 
-83 dBu (unity gain, two channels routed)


Total Harmonic Distortion: 0.015% at 1kHz, 0dBu 0.015% at 10kHz, 0dBu


Inter-Channel: < -80dBu typically


LF: Shelving at 100Hz ± 7dB
HF: Shelving at 6.5kHz ± 7dB


Pan Range: Off/-3dB centre/off
Balance Range: ± 6dB

Common Mode Rejection Ratio

Mic Input: >60dB typically

Digital I/O

Sync Input Sample Rate Range: 32kHz – 96kHz
Output Sample Rates: 32kHz, 44.1kHz, 48kHz, & 96kHz (Using Onboard Clock)
Output Sample Width: 24 bit


Headphone Output Load: >45 ohms, recommended 400
Maximum Output (Analogue): +26dBu balanced into 2k or greater

Rear Panel Switches

Phantom Power: +48V individual per mic input
Gain Switch: +10dB per XLR balanced mono & stereo input & EXT 1, EXT 2 inputs

Input & Output Connections

Analogue Inputs: 5 x Microphone XLR 3 pin sockets
2 x Mono line XLR 3 pin sockets
2 x Mono/stereo line combi XLR 3 pin sockets & 6.35mm stereo jack sockets
1 x Telco XLR 3 pin socket
5 x Stereo line pairs XLR 3 pin sockets
2 x Stere line pairs phono sockets
1 x Stereo cleanfeed pair XLR 3 pin sockets
1 x Stereo insert, 3.5mm jack socket
Digital Inputs: 2 x S/PDIF phono sockets,
2 x TOSLink optical connectors
Analogue Outputs: 

2 x XLR 3 pin plug (balanced)
9-way ‘D’-type socket (balanced)
XLR 3 pin plug (balanced)
2 x XLR 3 pin plug (balanced)
Monitor Outputs: 6.35mm stereo jack sockets (2 x Presenter, 1 x Guest, 1 x Monitor)
Digital Outputs: AES/EBU XLR 3 pin plug (balanced) or S/PDIF phono socket.
Digital Sync Inputs: Wordclock on BNC, AES/EBU on XLR socket and S/PDIF on phono socket.
EXT Inputs: 9-way ‘D’-type socket
Mono Remotes: 25-way ‘D’-type plug
Stereo Remotes: 25-way ‘D’-type plug
Meterbridge Port: 15-way ‘D’-type socket
Talkback Interface: 9-way ‘D’-type socket
RS232 Serial Port: 9-way ‘D’-type socket
Mains Input: Filtered IEC, continuously rated 85-264VAC, 47-63Hz, 45w nominal, 50w peak
Fuse Rating: Anti-surge fuse 2A 20 x 5mm 

Equipment Type

S1: S1 radio broadcast mixer

Physical Specification

Dimensions (Raw): 44.5cm (W) x 40.0cm (D) x 15.6cm (H)
17.5” (W) x 15.75” (D) x 6.1” (H)
Dimensions (Boxed): 63cm (W) x 57cm (D) x 35cm (H)
24.80" (W) x 22.44" (D) x 13.78" (H)
Cut-Out Dimensions: 44.0cm, 17.3” (W) x 38.1cm, 15” (D) 
both dims +0.2cm, -0cm
Weight: Nett: 12.0kg  Gross: 13.6kg
Nett:  24.4lb  Gross: 29.9lb


S1-RCK: Optional S1 9U rack ears.

What we think...

The S1 is the ideal mixer for any small studio or production facility where professional, balanced audio is required. The desks flexibility and advanced features make it great value for money.

Peter Jarrett - Broadcast Radio





Download The User Guide

Download the S1 User Manual.

Download - File size: 3459KB

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