Controller Setups

Setups for loudspeaker management systems

Before building setups for a loudspeaker management systems, we extract as much information from the speaker as possible. Minimum requirement is measuring the transfer functions (magnitude and phase) for each driver in an anechoic room. From these results, we create crossover filters considering magnitude and phase of the speaker. If the loudspeaker management system supports independent adjustment of magnitude and phase, it is possible to have a system with linear phase that is, no phase distortion.

For also optimizing the directivity, we perform balloon measurements and analyze the effect of different crossover filters on the directivity. With our proprietary software tools we determine the resulting transfer function and directivity from the balloon data and the crossover functions. This allows us for instance, to systematically use overlapping bands to optimize the directivity. Furthermore, for specific combinations of amplifier and speaker, the limiter settings are adjusted.

In the end a measurement of the complete system and a listening test for a subjective evaluation is carried out. For multiple speakers/line arrays, we implement the appropriate filters for different combinations.

Cardioid setups for (sub)woofers

In order to create setups for cardioid (sub)woofers, extensive and elaborate free field measurements in wide open spaces (parking lots, soccer fields) need to be carried out. To circumvent excessive costs, we use a process, which combines measurements in an anechoic chamber with BEM simulation technique. At first, laboratory measurements of a single subwoofer with its individual drivers are performed, followed by a BEM simulation of the desired arrangement of multiple subwoofers, which exactly incorporates the geometry of the housing, every single loudspeaker membrane and the occurring diffraction. Appropriately merging measurement and simulation data provides the basis for establishing user-defined setups.
From this data, it is possible to easily create presets for arbitrary numbers and arrangements of subwoofers for any kind of application.



  • Measurements of individual speakers in a loudspeaker system
  • Design of setups for loudspeaker management systems (FIR, IIR or FIR+IIR) with optimization of directivity and distortion behavior.
  • Design of setup libraries for line array and loudspeaker families
  • Implementing limiters
  • Design of cardioid setups for arbitrary speaker arrangements
  • Implementation of setups on arbitrary loudspeaker management systems


Michael Makarski

Anselm Goertz