How many DSP channels are necessary for a FIRmaker setup?

FIRmaker is able to work with any number of DSP channels. AFMG's general-purpose approach is one DSP channel per cabinet.

In very large arrays it will be possible to combine two or even three cabinets into a single source driven by one FIR DSP channel without too much trade-off.

The number of FIR and amplifier channels used per cabinet is not limited, on the other hand. Dozens of channels could be calculated by FIRmaker per box. Even vertical + horizontal optimization would be possible if implemented by the loudspeaker manufacturer.

Can single loudspeakers be optimized with FIRmaker?

This depends on the type of loudspeaker. FIRmaker can optimize the coverage of a column loudspeaker, or any other single loudspeaker that has multiple drivers operating in the same frequency region.

Theoretically it would be possible to use the FIRmaker algorithm as a simple tool to generate FIR-based crossover filters for conventional loudspeakers. However, FIRmaker was originally not intended as an optimization tool for a loudspeaker with only one, or very few, drivers operating in the same pass band (frequency range).

What would a typical optimization approach look like?

Two things are needed as a basis for FIRmaker optimization:

  • FIRmaker enabled, high-resolution loudspeaker data "GLL"
  • The definition, "model" of the venue to optimize the setup to.

The loudspeaker data is provided by your loudspeaker manufacturer. The model of the venue is defined by you. - AFMG provides the EASE Focus 3 software for this purpose. Different criteria can be defined in your setup. Mainly, these will be audience areas to aim the sound to and exclusion areas that FIRmaker will try to avoid sound from going to.

How do I get the FIRmaker results into my DSPs?

Support for different DSP platforms is rapidly growing. Currently it is already possible to export CSV and other, general filter types and to save them to files. These can be imported into your DSPs.

More and more DSP manufacturers work together with AFMG to enhance the integration of FIRmaker with their platforms. (Please see "Supported Brands / Supported DSP Platforms" for a comprehensive list.) At a final stage, these implementations will support a direct transfer of system setups and FIR filters between the controller software and FIRmaker.

Does it make sense to use FIRmaker with an array driving two or more loudspeakers with one amplifier?

Many modern arrays and especially column loudspeakers already integrate amplifiers and DSPs directly into the cabinets. For such systems, FIRmaker optimization is tailor made. However, many other existing systems employ amplification and processing in separate components. In many cases an affordable hardware solution will be driving two, three or even four cabinets with one amplifier channel. Consequently, only one DSP channel will be feeding the signal to several cabinets at once.

Ahnert Feistel Media Group

Located in Berlin, Germany, AFMG® Technologies GmbH has created the industry standards EASE and EASERA software for acoustic simulation and measurement as well as their related products EASE Focus, AFMG SysTune, EASE Address and EASE SpeakerLab.

In cooperation with our partner company SDA Software Design Ahnert GmbH we develop and distribute software for:

Electro-acoustic and
room-acoustic modeling
Electronic and acoustic
measurements
Applications in
engineering and physics
RF and infrared
simulation

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