Learn more about Dynamic SoundField by Phonak with this helpful list of Frequently Asked Questions.

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What is Dynamic SoundField (DSF)?

Dynamic SoundField (DSF) is a unique room amplification system by Phonak that improves speech intelligibility in training and conference rooms, boardrooms and small auditoriums.

The Dynamic SoundField system automatically monitors the background noise level in the room and dynamically adapts its gain to the speaker’s voice. This ensures excellent speech intelligibility for listeners, independent of whether or not they are quiet or there is background/surrounding noise in the room.

What are the system’s key features?

  • Unique ‘line source’ loudspeaker unit: 12/15 high quality loudspeakers per loudspeaker array (DigiMaster 5000/7000)
  • Fully automated settings: dynamically adapted gain setting
  • Built-in FM compatibility: one inspiro serves both DigiMaster and FM receivers
  • Intelligent frequency hopping: avoids interference with other digital systems (WLANs, Bluetooth)
  • Future-proof: USB connection allows easy future internet upgrades.

Rooms & Positioning

How many rooms or halls per building can DSF be used in?

Dynamic SoundField can be used without restriction in any number of a building’s rooms. Its intelligent digital transmission technology means that no channel switching is needed.

Where should DigiMaster loudspeaker(s) be placed in the room?

This depends upon the DigiMaster system in use (5000 or 7000) and the shape/size of the room.

If using the DigiMaster 5000 loudspeaker in a regular-sized room, the speaker should ideally be placed at the front or the back (either on its floor stand or mounted on the wall).

For ideal in-room placement, we also recommended you apply the following suggestions to your Dynamic SoundField set-up:

If using two DigiMaster 7000 loudspeakers in a larger square-shaped room, place both speakers in the front two corners of the room.

If using the system in a larger rectangle-shaped room (with the speaker at the narrow end), place one loudspeaker at the front and the second half-way down one side of the room.

  • Try to avoid noise sources being between the DigiMaster loudspeaker and listeners
  • Avoid long power cables running between the DigiMaster and the power socket
  • Choose a loudspeaker location that disturbs neither speaker nor listeners

What sized rooms can the DigiMaster 5000 be used in?

The DigiMaster 5000 is designed for use in rooms measuring up to 100 square meters (1076 sq. ft) or roughly 100 listeners.

What sized rooms can a pair of DigiMaster 7000’s be used in?

One pair of DigiMaster 7000 loudspeakers is designed for use in rooms measuring up to 300 square meters (3230 sq. ft) or roughly 300 listeners.

Configuration & Connection

Can I use a DigiMaster 5000 loudspeaker with a DigiMaster 7000?

No. Only a pair of DigiMaster 7000 loudspeakers can be used simultaneously with the same inspiro transmitter.

Can I use two DigiMaster 5000’s together?

No. A DigiMaster 5000 is designed to be used alone. Only a pair of DigiMaster 7000 loudspeakers can be used simultaneously with the same inspiro transmitter.

Can I use DSF with an interactive whiteboard or multimedia device?

Yes, easily.

To connect Dynamic SoundField to an interactive whiteboard, screen or multimedia device, simply run a standard audio cable from the DigiMaster’s audio jack to the Audio Out jack of the device in question.

How do I connect to an interactive whiteboard that doesn’t have an audio output?

This is possible using the whiteboard-connected computer and 2 inspiro transmitters that are already connected to a Phonak MultiTalker Network (MTN).

One inspiro is the initiator or ‘master’ device. This is worn by the speaker. You then require a male 3.5mm (0.13-inch) to 2 female 3.5mm splitter (bought separately).

Plug the splitter’s male end into to the computer’s headphone output. Then connect one female end to the DigiMaster, and the other to the secondary inspiro.

Set this secondary inspiro to ‘iPod Nano’ setting (see Settings/Audio input/Audio device/ iPod nano) and adjust the computer’s output volume to 2/3rds of its maximum.

Transmission & FM

Which wireless transmission technology does DSF use?

Phonak developed an exclusive digitally modulated transmission technology for Dynamic SoundField called DM (for ‘Digital Modulation’). This works within the globally license-free 2.4 GHz band. DM technology does away with the need for channel management and is extremely robust against interference from other digital wireless systems such as WiFi networks and Bluetooth systems.

How do I use DSF with Phonak FM systems?

inspiro is Phonak’s transmitter for both Dynamic SoundField and personal Phonak FM systems. A speaker who is using Dynamic SoundField and has hearing-impaired listeners who wear Phonak FM systems in the room therefore only needs to wear one inspiro. This is because inspiro transmits their speech both to the DigiMaster loudspeaker and listeners’ FM receivers.

Different inspiro transmitter versions are available, offering different types of functionality.

  • For presentations in which all listeners are hearing impaired and wear Phonak FM systems, use the inspiro Premium transmitter in its default mode (169 – 220MHz).
  • If there are normal hearing and hearing-impaired listeners in the room, use instead inspiro Premium in ‘FM + SoundField’ mode (this emits DM and FM in parallel).


What kind of microphone can be used with a DigiMaster loudspeaker?

The DigiMaster can be used with either Phonak’s face-worn EasyBoom microphone (for the best sound performance) or shirt-worn iLapel microphone (for simplicity and flexibility). Both accurately pick up speech without amplifying the surrounding noise.

How does DSF work with multiple presenters?

Phonak’s MultiTalker Network technology was successfully introduced in 2008 and is also built into inspiro and Dynamic SoundField. It enables up to 10 speakers to talk to the audience and be heard through the loudspeakers, whether these are additional presenters, assistants or audience members asking questions.

The MultiTalker Network (or MTN) provides a very clean speech signal because only one microphone is ‘open’ at any one time. It also eliminates the need to carefully select different frequencies for any additional microphones, as is required for example by existing infrared systems.

Inspiro and Phonak’s DynaMic passaround microphone can both be used over the MTN, however there must always be at least one inspiro used as this is the network’s ‘master’ transmitter.

Energy Use

How energy efficient is DSF?

Dynamic SoundField fulfills all the latest Eco design standards for Europe, as released in January 2010.

When a DigiMaster loudspeaker (5000 or 7000 model) is turned off, its power consumption is less than 0.5W. In stand-by mode it is less than 1W. During normal operation, one DigiMaster typically consumes about 3W.

This is a mere fraction of the energy used to light a room and hence a fraction of a building’s total energy costs.