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MinFerno Commentator’s Box

  • Single user Dante commentary box
  • System is scalable with multiple commentators as part of a Dante network
  • Can connect to any Dante compatible network
  • Single low noise mic/line/48V input
  • Our popular Referee compressor/limiter keeps even the loudest commentator sounding natural
  • Headphone mixer has up to 4 inputs supplied from the Dante network, plus the local input (sidetone)
  • Each headphone input has left/both/right headphone switching
  • Up to 3 talkback circuits
  • Large illuminated on air and talkback switches
  • Multiple power options including PoE, & External DC
  • Network connections on Copper (Cat5) and Fibre (SFP slots)
  • Primary & Secondary network connections allowing completely transparent network redundancy
  • Large bright PPM level meter
  • Inbuilt web server for setup and remote control via web browser of mic gain & mic on/off switch

 DANTE® Audio Network

  • AES67 Compliant
  • Multi channel, digital media network technology
  • Offers compatibility with hundreds of systems from other manufacturers
  • Scalable from a pair up to thousands of channels
  • Fully redundant glitch free audio transport
  • Easy, reliable & free routing software for point to point, or point to multipoint audio routes
  • Works across standard network switches

MinFerno is a new, smaller, and even easier to use version of our exceptionally popular Inferno network audio commentary box.

MinFerno is designed for a single commentator/ announcer to use, and like its big brother the Inferno, it provides the very best possible commentary microphone amplifier and compressor limiter circuit for amazing on air sound.

The MinFerno is easy to use for commentators who would rather be talking about the game than figuring out how the equipment works.  It is built to our exacting, rugged & robust standard to make it a reliable piece of broadcast equipment for the busy engineer.

Redundant Powering Options 
The MinFerno can be powered from any of 3 different sources:
1) PoE on the Primary CAT5 Network link
2) PoE on the Secondary CAT5 Network link
3) External 12V DC
Four of rear panel LEDs show the availability of the 3 power sources.

Primary & Secondary SFP Slots
The SFP (Small Form-Factor Pluggable) fibre slots are standard networking ports that accept standard SFP modules. This means that you decide what type of fibre and connector style you want to use just by the SFP module that you insert. The primary & secondary network circuits allow for glitch free redundancy across both the Fibre & Copper network interfaces. 

Primary & Secondary Copper Network Connections with PoE 
Two CAT6 connections on Neutrik Ethercons (that accept standard networking cables) are provided to allow copper connections to local network switches to carry the Dante/ AES67 audio. Two connections are fitted to allow redundant circuits to be used if required.
Both of these connectors can accept a PoE power source for providing the power to the MinFerno.

Input Mode & Gain
One pair of push buttons selects the input type of the front panel XLR to be either microphone, line or microphone with 48V phantom power. 3 LEDs indicate which input mode is selected.
Two push buttons are used to alter the gain of the input. LEDs indicate if the gain setting is above or below our pre-configured ‘lineup’ levels. The front panel PPM of course provides an accurate indication of the input level.
The gain can also be altered remotely by a web browser pointing at the MinFerno's web page.

Up to 4 of Incoming Audio Volume Controls 
On the top panel are up to 5 rotary headphone volume controls. 4 of these are connected to 4 incoming audio circuits from the Dante/ AES67 network. These are normally used for such sources as mixed programme or cue, talkback to director, talkback to producer, talkback to engineer etc.

Sidetone Volume Control
The 5th front panel rotary headphone volume control is ‘sidetone’. Sidetone is the commentator's own voice in their own ears. 

Headphone Routing 
Each of the 5 headphone volume controls has an associated left ear, right ear, both routing switch located next to the volume knob. This single push button switch routes the associated source to just the left, just the right or both channels of the stereo headphone amplifier. 
To enable the commentator to know how they are routing a circuit the first time a routing switch is pressed, a pair of LEDs on the front panel indicate its current routing arrangement. The next time the routing switch is pressed then the next routing option is selected.

Robust Mic On and Talkback Buttons
There are up to 4 of large bright illuminated buttons (1 for programme and up to 3 for talkback). These switches route the outgoing microphone circuit onto up to 4 different Dante/ AES67 network audio circuits. The operation of these switches (momentary, latching etc) and the interaction of these switches (i.e. pressing a talkback switch mutes the main mic) can be fully configured via the web page.

15 segment LED PPM Meter 
Audio input level is indicated on the 15 segment PPM meter.

Low Noise Microphone Amplifier With Remote Gain
We spent a long time optimising the performance of the THAT corporation microphone amplifier used in the original Inferno and used again on the MinFerno. It features very low noise & distortion circuit that we remote control the gain of in 1dB steps, which allows us to provide the remote webpage gain control as well as the rear panel gain push buttons. We also optimised the circuits to allow correct source impedance switching depending on whether the input has been set as a mic or line input.

Referee Compressor Limiter
As with all our commentary units, the MinFerno features our very popular Referee compressor limiter circuit. This circuit starts to compress the commentator’s voice gradually and slowly increases the compression ratio as the input level becomes overly high, resulting in a very natural sounding and distortion free audio output capable of taming even the loudest of commentators.

High Quality Analogue To Digital Converter (ADC) 
Dante/ AES67 network audio is a digital circuit and as such the best analogue microphone amplifier would be wasted if we hadn’t paired it up with the best analogue to digital converter. The ADC's job is fairly simple, and if you look at our tech spec you’ll see that we’ve made ours work incredibly well.

Unique Headphone Amplifiers
The commentator’s headphones are a vitally important tool so we take as much care with our headphone amplifiers as with our on air microphones. Our unique headphone amplifier provides the correct output level regardless of the impedance of the attached headphones, meaning that broadcasters can now pick and choose between low impedance ‘cheap’ headphones and high impedance traditional broadcast ones. 

Web Page Remote Control
The MinFerno has an internal web server that provides web pages for an operator to view when pointing a web browser at the MinFerno's address. The MinFerno uses a very useful network protocol called DNS (Domain Name System) allowing just ‘MinFerno and the unit's serial number’ to be entered in a browser’s address bar to connect. This is very useful if the IP address is not known.

Mic ON/OFF, Gain & Meter
One of the web pages allows access to the gain of the microphone meaning that the input gain can be adjusted completely remotely. The same page also provides the ability to turn the microphone on/off (and of course see its current state). A level meter is also provided on the same page so as any gain adjustments can be accurately monitored.

Channel Operation Configuration Page
Full control of how each of the 4 (3 talkback & 1 main mic) switches operate is provided. Each switch can be set to operate in the following modes: off, momentary on, latching, intelligent, momentary off (cough). The routing of the associated headphone input can also be forced or locked and the ability to fully attenuate the incoming source is also available.

Channel Effect Configuration
The MinFerno’s channel effect page allows the interaction between the talkback & mic switches to be set. Each channel can be set individually to either temporarily or permanently suppress (or not) any of the other channels that are already active when it is operated.

MINFERNO: Simplest version just programme go and return & sidetone 

MINFERNO/1: MINFERNO plus 1 x talkback go and return

MINFERNO/2: MINFERNO plus 2 x talkback go and returns

MINFERNO/3: MINFERNO plus 3 x talkback go and returns

There are 2 sets of Firmware (software code) that run in the MinFerno

1) There is an internal microprocessor that handles all the switches, gains and also provides the webpage, this has 1 set of firmware.

2) The Dante Network interface has its own firmware.

There are different updating techniques for each of these 2 sets of code.

1) Updating the microprocessor firmware

MinFerno Firmware is currently on version V2.01, to check your current Firmware version that is installed please check on the web interface.

The firmware is the code that runs internally in the MinFerno and provides the structure for the Microcontroller. The firmware can be updated without the need to return the unit to Glensound.

How To Update The Firmware:

1) Get the new firmware from Glensound’s web site. 
A) Copy and paste the below into your browser to download the file:

Please note the above address is just the address where the file is stored, there is no webpage there, but when you copy and paste the link in your browser it should automatically download. Please download the corresponing TB file for the amount of talkbacks your unit has.

Make sure you know where your browser has downloaded and saved the file as you’ll need it in a minute. Note Windows sometimes underlines the address above as a link, if you’re typing this in a browser directly then the last part is ‘Minferno_v1.0.2.dfu’

2) Install on a PC a programme called Dfuse. This is a program that is supplied by ST Microelectronics who are the manufacturer of the intelligent microprocessor that we use in the MinFerno. Just Googling Dfuse should provide the link to ST Microelectronics Dfuse download page. Follow the download instructions to download and install Dfuse on your PC.

3) Make sure you know where the latest version of the MinFerno's firmware is located on your pc (this is a .dfu file). This is a file that Glensound will have sent you or you downloaded in step 1.

4) Connect the USB port on the rear of the MinFerno that you want to update to a USB port on your PC.

5) Press and hold the ‘IDENTIFY’ button. While pressing the ‘IDENTIFY’ button, press and release the recessed ‘RESET’ button (you’ll need a pencil or pointed object to push the recessed reset button. Do not press too hard, it only moves a small amount).

6) If this is the first time you have connected the MinFerno to the PC then windows will load drivers for it.

7) Open the Dfuse software and in the top drop down list select the device shown (there should only be one device available called something like 'STM device in DFU Mode'

8) Under the 'Upgrade or Verify Action' box at the bottom right area of the Dfuse software, use the 'choose' button to locate the downloaded .dfu file.

9) Tick the 'Verify after download' box

10) Use the ‘update’ button (next to the choose button) in the Dfuse software to start the update.

11) Wait for the update to be completed.

11) Press the recessed ‘RESET’ button (or turn the Inferno off / on)…..the new firmware will now be loaded.

2) Updating the Dante Network Interface

The latest version of Dante firmware makes the unit DDM compliant and also AES67 compliant. 

It is worth noting that a previous version of code was released to cure an issue with the webserver being swamped by multicast audio data (the symptoms of which are very slow or unresponsive webpages). The Dante network interface needs to be updated on all MinFerno's shipped before the end of April 2017 (Serial numbers 281 & below). 

The firmware that runs the Dante Network Interface is updated using Audinate's Firmware updating tool (Audinate are the company behind Dante). The updating tool and a user guide can be downloaded from Audinate's website

Please note we strongly advise that when you do the update that only your PC and the MinFerno that you wish to update are on the network to save accidentally updating the wrong Dante device.


Input Type: Neutrik 3 pin XLR

Input Impedance: Mic: 2k4
                              Line 100k

Equivalent Input Noise: 127dBu (22Hz-22KHz) RMS A weighted Terminated with 300 Ohms

Frequency response:  Mic -2dBu @25Hz flat @50Hz till 22kHz (+/- 0.25dBu).
                                   Line flat till 22kHz

Distortion at +8dBu:  100Hz = 0.023%
                                   1kHz =0.012%
                                   10kHz = 0.014%

Line Up Gains:            Dynamic Mic: 58dB
                                   Mic + Phantom Power: 35dB
                                   Line: 0dB

Gain Range:                Mic: -30 to +15dB
                                   Line: +/-15dB 

Max Input Before Clipping (@line up): 
                                  Dynamic Mic: +10dBU,
                                  Mic+phantom: +18dBu
                                  Line: +18dBu


Headphone Impedance: 16-1000 Ohms (auto output level to match impedance)
Headphone Noise:  -76.6dB @ line up (residual noise)
Headphone Frequency Response:  >-0.1dB 22Hz to 22kHz
Headphone THD + Noise (Ref +8dB): 0.008% @ 1kHz
Connection: 6.35mm & 3.5mm stereo jack plugs
Headphone Volume Pot Range: +10dB to Off (can be configured +10dB to -30dB)
Maximum Headphone Output: +16.8dB into 600 Ohms


Physical: 2 x Neutrik Ethercons Cat6 RJ45s & 2 x SFP slots
Type: Fully redundant Primary & Secondary circuits
Sample Frequency: 48K
Resolution: 24 Bit
Control & Routing: Via Free Dante Controller
AES67: Compliant (Can be configured for AES67 via Dante® controller)
NETWORK TYPE: Gigabit Ethernet


PoE: Can be powered by PoE on either Copper network interface
PoE: Complies to IEEE 802.3af-2003 classification class 0
DC Input: 2.5mm Barrel, Centre +Ve, 9 - 15 Volts
Consumption: Front Panel Power On LED: Bright Blue
Rear Panel Power On Indicators: 1 green LED showing presence of each of the above power sources


Size: 144 x 179 x 76mm (WxDxH)
Weight: 1.01Kg (2lb3oz)
Mechanics: All aluminium construction, anodised and laser etched, powder coated sides
Shipping Carton: Rugged Export Quality cardboard carton 610 x 420 x 170mm (WxDxH)
Shipping Weight: 2.5kg


Operating Temperature: 0 to +50°C (32 to 122°F)
Storage Temperature: -20 to +70°C (-4 to 158°F)
Relative Humidity: 0 to 95% non-condensing


Handbook: Handbook can be downloaded
Mains Cable: UK & EU only, 2 metre mains plug to IEC
RJ45 Network Cable: 1 of 2 Metre


Carrying Case: Polypropylene Carrying Case
SFP Fibre Modules: Multi Mode, Single Mode and Bi-directional on single Fibre available
External DC Power Supply: Switch mode (100 - 250VAC) desktop style with IEC mains input & 1.5 metre DC output cable  

Please use one of the following methods to contact us:

Telephone: 01622 753662
International: +44 1622 753662
Skype: live:marc_8167
Online: contact form