Radial SGI TX

Essential Information About the SGI Mono Signal Extender (Transmitter)

• Transmitter dedicated to the SGI Mono system for transmitting an instrument signal over an XLR connection, with faithful and stable reproduction.


• High-end sound thanks to a 100% discrete Class A circuit and transformer isolation.


• Optimal instrument adaptation via impedance correction (variable input impedance) to preserve attack, dynamics, and brightness.


• Road-ready design: 1.55 mm steel chassis, compact format, and 9 to 15 V DC power supply.

A Key Link in an SGI Mono System: Designed to Secure Instrument Connections

In a guitar, bass, or electro-acoustic instrument chain, loss of definition and noise increase as cable lengths grow. This signal extender in transmitter format fits into the architecture of an SGI Mono system: it converts and prepares the signal upstream to deliver it cleanly via an XLR output, with a design focused on audio quality and robustness.

Its positioning is clear: a tool aimed at stage and studio use for those who want to maintain the instrument feel (dynamics, nuances, response) while securing signal transport in demanding environments.

Who Is This Signal Extender Ideal For, and In What Applications?

This transmitter is intended for guitarists, bassists, multi-instrumentalists, and technicians managing complex setups, backstage racks, distant pedalboards, or studio configurations where the instrument is not next to the amp or control room. It is particularly relevant when you want to keep a clean and consistent signal without relying on a long instrument cable and without sacrificing playing feel.

Thanks to its impedance correction and integrated preamp, it helps preserve the character of passive pickups as well as active outputs by limiting high-frequency compression and maintaining a consistent response from one instrument to another.

Audio Design: Transparency, Dynamics, and Control

100% Discrete Class A and Transformer Isolation

The embedded technology is based on a 100% discrete Class A circuit combined with transformer isolation. The goal is twofold: to preserve the grain and dynamics of the instrument signal while improving tolerance to challenging electrical environments. The result is precise reproduction, with very low distortion and contained noise, suitable for modern setups as well as busy stages.

Impedance Correction: Adjusting the Instrument's "Feel" and Response

Impedance correction allows adapting the input to the instrument and upstream chain. By adjusting the variable input impedance, you can optimize clarity, warmth, or perceived attack, and regain a behavior closer to what you enjoy with a short instrument cable, depending on your pickups and playing style.

Measured Performance: Low Noise, Wide Headroom, and Broad Response

With a signal-to-noise ratio of 102 dB, a dynamic range of 112 dB, and a THD of 0.005% at 1 kHz, this transmitter aims for clean, stable, and professional-grade reproduction. Its frequency response from 20 Hz to 18 kHz helps maintain solid low-end and clear highs while remaining consistent with instrument signal requirements.

Technical specifications

Category	signal extender	Frequency response - start	20 Hz
Number of channels	1	Frequency response - end	18 kHz
Max input level (dBu)	10	Inputs	jack
Integrated preamp	Yes	Analog outputs	XLR
Signal-to-noise ratio	102 dB	Color	Yellow
Settings	impedance correction	Weight	0.68 kg
THD	0,005% @ 1 kHz	Dimensions (mm)	70 x 108 x 44

System	Transmitter for SGI Mono system	Input impedance	Variable from 10 kOhms to 1 MOhm
Outputs	XLR	Output impedance	4.5 kOhms
Frequency response	20 Hz - 18 kHz	Technology	100% discrete Class A circuit with transformer isolation
Dynamic range	112 dB	Very robust build	1.55 mm steel chassis
Maximum input level (dBu)	10	Power supply	9 to 15 V DC
Controls	Impedance correction