eela Audio The digital Broadcast and Production mixer D4

D4 Mixer

D4 professional all digital dual DSP "on-air" mixing console with 16 input faders, 32 stereo inputs and 16 outputs in total for up to 10 cleanfeeds.
2 touch screen color displays for meters and settings.
Programmable channel on/off / start button for each input fader.

Rugged mechanical design and wear resistant Alugraphics front panel


8 balanced microphone / mono line inputs with 48V phantom powering, to be configured as studio or control room microphone.
8 AES/EBU digital inputs with built-in sample rate converter on XLR-type connectors.
16 stereo balanced line inputs on XLR connectors, 2 unbalanced 'EXT'  line inputs on jack
Each input can be assigned to a fader. E.Q., dynamics, input type etc. can be set individually per input.

Channel logic:

Fader start, continue or pulse; 'Start' on/off button; Pfl. active output; Enable codec / hybrid output (hybrid 'on'); Talkback button for each channel.
Channel remote mute input; Ring detect input to signal incoming calls from hybrids;
Fader overrule (unity gain e.g. for automatic commercial broadcast); Remote pfl. 'on');
In order to integrate the mixing desk with broadcast automation software all these functions are available on a USB connector.

D4 Mixer


2 main stereo outputs balanced analogue and AES/EBU digital on XLR.
1 'recording' output allowing for recording while on-air, balanced analogue and AES/EBU digital on XLR
5 programmable 'AUX' outputs balanced analogue and AES/EBU digital on XLR
5 stereo analogue 'AUX' outputs on jack,
These 10 'AUX' outputs can be configured as a standard AUX, for hybrid or other 'outside source' stereo cleanfeed or studio foldback with talkback on each output.
1 control room monitor output with volume control, mute and dim function.
1 headphones output with volume control.
1 Pre fade listening output.
The digital outputs can be 'linked' in function to any of analogue outputs including monitor and headphones.
Also the digital headroom is adjustable over a 20 dB range.

Monitor and Meters:

2 large color touch screen displays, one for control and settings with clock and one for meters with PPM characteristics and individual source selector.
Control room monitor with volume control, source selector, mute and dim function.
Headphones output with volume control, independent source select on jack connector.

Broadcast logical functions:

All standard broadcast logic functions available: Red light signaling for Studio and Control Room,
Remote recall of stored settings also by means of a simple external switch.
Logic controls are available on 3 pcs.  25 pin D-type connector with 8 general purpose opto isolated outputs and 8 inputs each. You can program a choice or a combination of the above functions to these inputs and outputs.
Universal buttons of On-Air switching and traffic announcement

System settings:

All settings can be stored into and recalled from non-volatile memory, also available is a mode were you can
remote recall previously stored settings by means of a simple contact closure. Selectable mode of operation at start-up.
System settings are password protected.


A Multipurpose I/O connector is available to add a multichannel USB audio or network audio PCB. Internally there is an extra TDM bus to connect to (third party) digital modules.

Further details you can get here D4 Manual

The five service areas of R. Barth GmbH & Co. KG for their studio include:


Plant engineering for soundproduction and processing in the radio and television // more »


Digital broadcasting systems of the transmission planning, program production and broadcast operations up to the broadcast automation // more »


Structure and system planning for radio stations, including space planning, building and room acoustics // more »


In-depth, expert advice, based on more than four decades, the evaluation of requirement profiles from the media area // more »

R. Barth GmbH & Co. KG

Innovative/en products and software solutions with individual vote, who are also reliable and safe to run // more »