R58 488.84
(R67 262.17 incl VAT)
Short description:

TELEPHONE BALANCE UNIT Digital, GSM hybrid, twin, AES/EBU, Ethernet, desktop


DHY-04GT Twin Automatic GSM Hybrid, AES/EBU & Analogue I/O With Ethernet


A new addition to the DHY-04 range is the ability for the DHY-04GT, a 1U rackmount twin telephone hybrid version, to be used on a GSM cellular (mobile) phone network instead of a telephone (POS) line. The DHY-04G can accept a SIM card in the rear panel slot and by connecting a suitable GSM antenna, the DHY-04G can receive and make high quality broadcast calls over the cellular network, converting the GSM call to the 4 wire audio signal to and from a connected mixing console. The GSM module used in the DHY-04G is quad-band GSM, so it can take and make calls on any 2G network.

Ideal for studios in remote locations, for OB vans and trucks on the move, and in emergency situations where a telephone landline can’t be guaranteed, the DHY-04G offers outstanding performance.

The DHY-04GT has all features of the DHY-04 (read cellphone/mobile features instead of telephony features in the listed bullet point specification) together with some additional front panel indicators. There are two LEDs, one for SIM enabled and one for GSM Network availability. Additionally there is a push button which allows the GSM signal level to be displayed on the meter LEDs.



The DHY-04 telephone hybrid is an enhanced redesign of the DHY-03 , the best performing telephone hybrid in the world. It now has auto-sensing combined analogue and AES/EBU inputs and outputs, front panel speed dial buttons, together with an Ethernet interface to allow web browser access to the configuration and internal settings. All whilst still retaining stunning line balance rejection figures. For the best sounding audio calls you’re likely to hear, you should specify the DHY-04.


Key new features of the unit include:

  • Auto-sensing combined analogue or AES/EBU XLR input.
  • AES/EBU sample rates up to 24 bit/96kHz accepted.
  • Configurable analogue or AES/EBU XLR output.
  • Ethernet port for remote configuration via web browser GUI.
  • Remote dialling and line hold control via Ethernet.
  • Ethernet network interface can generate SNMP Traps for SNMP management systems.
  • DTMF dial tone recognition for reporter remote access - a journalist can dial into the unit which can recognise a pre-programmed DTMF numeric password to automatically connect the journalist on-air.
  • Four front panel speed-dial buttons for dialling internally preset phone numbers.
  • Front panel Redial button for redialling the last number.


The DHY-04 also has the following features:

  • Fully automatic - adapts to varying line conditions and has automatic signal limiting.
  • Fully adaptive echo cancellation to 127msec - default is 24msec.
  • 70dB typical line balance rejection offering superb performance and crystal clear audio.
  • Front panel input and output gain controls.
  • Front panel LED metering of receive and send signals.
  • Built-in conferencing for 2 hybrids, so that a single telco channel on a mixing desk can receive 2 calls.
  • Integrated ring detector - automatic call answering after a pre-determined number of rings.
  • Automatic call disconnection. Fitted with K-break, line polarity reversal and dial tone disconnect detection, defined by the country selection.
  • Automatic ducking facility allows the talent to ‘shout-down’, or talk over, a caller by reducing the gain of the caller’s signal if it goes above a certain level.
  • Local and remote line hold switching - calls can be remotely switched through a mixing console.
  • Line hold/release button to control line hold circuit, illuminates to indicate the status of the line and flashes to show ring status.
  • DTMF tone recognition allowing a opto-isolated GPI output to be made on receipt of selected DTMF tones, e.g. for starting a studio automation recorder automatically to record a remote telephone interview.
  • International operation with built-in configurable settings for each country. Country selection allows the unit to provide line impedance and a simulation circuit to match the country.
  • RS232 serial port for remote control of the TBU & DTMF tone dialling.
  • Remote port distributes the remote line connect switch and tally output, a momentary/latch selector and the DTMF detect output.
  • The remote line connect switch can be either momentary or latching in its action.
  • Balanced mic/line input - 10k balanced input selectable for 0dBu clean feed line, or microphone level with adjustable gain.
  • Balanced output - 0dBu low impedance balanced output, with output gain settings.
  • Record output - the conferencing output can be set via a jumper to give a mix of the caller and mic/line input signals for recording both sides of the telephone conversation.
  • Line limiter, bandpass filter and output noise gate with preset threshold providing low distortion audio.
  • Built in universal power supply between 90V AC and 250V AC, 47-63Hz, IEC mains input.
  • ETSI approval compliant with European PTT specifications.


Sonifex Dialler

The Sonifex Dialler is a Windows ™7/8 and Windows™ 10 application for simple connection and control of a single DHY-04/G hybrid.


To connect to a hybrid, simply enter/select the TCP/IP address in the drop-down list at the top left of the screen, then click the connect button.


The dialler has a numeric keypad, speed dials, last number re-dial, Rx and Tx metering, status indicator.

There is also signal strength indicator when connected to a hybrid with a GSM module.

Analogue Audio I/O

Input Impedance - Line Mode (Clean Feed): 10kΩ balanced 0dB
Input Impedance - Conferencing: 10kΩ balanced 0dB
Input Impedance - Microphone Mode: 2kΩ balanced
Input Level Gain Range: +6dB, 0dB, and -6dB adjusted by 3-position front panel switch, +10dB jumper
Microphone Level Gain Preset: From 65dB to 35dB
Maximum Input Levels: Line +26dBu, mic -24dBu
Clean Feed Limiting Input: -4dBu for CTR21 setting, other values available *
Output Impedance - Line Out: 50Ω balanced floating 0dBu
Output Impedance - Conference/Record: 50Ω balanced floating 0dBu
Output Level Gain Range: +6db, 0dB, and -6dB adjusted by 3-position front panel switch

Digital Audio I/O

Input Impedance: 110Ω ±20% balanced
Output Impedance: 110Ω ±20% balanced
Sample Frequency Range: 30 - 100kHz (i.e. including 32kHz, 44.1kHz, 48kHz, 64kHz, 88.2kHz & 96kHz)
Signal Level: 2V/7V peak to peak min/max
Analogue Input Level for Full Scale Digits: +18dBU

Telephone Line

Rejection Ratio: 80-88dB on complex waveforms, reference peak level of 0dBFS
Ring Detector Sensitivity: Off, 2, 4 or 6 rings

GSM Connection

Module Type: Quad-Band EGSM 850 / 900 / 1800 /1900MHz
Output Power: Class 4 (2W) @ 850 / 900MHz,
  Class 1 (1W) @ 1800 / 1900MHz
Sensitivity: -107 dBm (typ.) @ 850 / 900MHz,
  -106 dBm (typ.) @ 1800 / 1900MHz
Approvals: Fully type approved conforming to R&TTE CE, GCF, FCC, PTCRB, IC, Anatel

Power Supply

Power to DHY-04G, GS & GT Universal 12W power supply: 90 to 250V AC; 47-63Hz; fused 1A
* These values are dependent on the actual country setting selected on the DHY-04  


Mic/Line/AES-EBU Input: XLR 3 pin female, with push-button mic/line selection
Line/AES-EBU Output: XLR 3 pin male
GSM Antenna SMA socket
Conferencing or Record Audio: RJ45 socket
Remotes: 9-way D-type socket
Ethernet: RJ45 socket
RS232 Serial: 9-way D-type socket
Power: IEC mains (CEE22)


Order Code Description
DHY-04GCON Front Panel Conversion Kit, DHY-04GS to DHY-04G
DHY-04GSCON Front panel conversion kit, DHY-04G free standing to DHY-04GS 19” (48cm) rack-mount front
DHY-04GTCON Front panel conversion kit, DHY-04G or DHY-04GS, to DHY-04GT 19” (48cm) rack-mount front
*Depth is measured from the front to the end of the connectors fitted to the back of the unit.  
Found a lower price? Complete this simple form:

Please feel free to contact us if you have any questions or need more information about this product using the form below.

No posts found

Write a review

Items of interest

Customers also bought