ACS acoustics systems are well know for their natural sound.

Systems are installed to make acoustics variable such that halls can be used for multiple types of performances or to optimize/repair the natural acoustics.
The acoustics generated should always be perceived as natural to the listeners/musicians present.

The video below contains an introduction to ACS Variable acoustics.


In a room of a certain shape and size sound will be reflected off (or absorbed by) the materials/surfaces present, as for example the walls, ceilings, floor, seats, etc.
The way  sound reflected  (and re-reflected)  the position a sound source within a room as well as how  the sum of direct and reflected sound is perceived by a listener at a particular position is what we call acoustics.

ACS changes acoustics by adding sound reflections to those that are already present.
To make sure this is done in a way that the listeners will perceive the total sum as being natural acoustics, it is very important that this happens at the correct place with the correct signals and timing.  (speed of sound)

A number of microphones. (typically 8-40) are used to pick up sound. The recorded sound is processed, amplified and reproduced using a number of strategically placed loudspeakers.  (often all mounted invisibly)

All loudspeakers together build a field of “virtual” sound reflections which will change the acoustics.

Generally a number of acoustics presets are programmed and together with the original acoustics of a particular venue this will enable the user to select, the acoustics best suited for particular type of performance.

So with the push of a button ACS can change the relatively dry acoustics of the typical modern theatre (suited for speech) into acoutics suited for chamber music or the lively acoustics of a good concert hall

In churches ACS systems are applied to change the acoustics between relatively dry used during lectures and amplified music  to acoustics with longer reverberation times for organ, choir and congregational singing.


The ACS signal processing

ACS, latest AE series processing main-frame was developed in co-operation with the Delft technical university. The main-fame containing very powerful digital processing can hold up to 96 audio inputs as well as 96 individually processed audio outputs. Several AE frames can be connected together to form larger systems.

The unique ACS concept for variable acoustics can now be applied with even more flexibility and at a moderate price.

Because different venues require different solutions, 4 processing modules were developed. One, or a combination of these modules are integrated in the main processing system and together they will form the system for variable acoustics

More information about these specific modules can be found using the menu above.

Rack containing processing and 70 power amplifier channels