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4.5 Custom Speaker Configuration

When you find yourself working on a multi-speaker installation which is not covered in the SPAT speaker arrangement presets, you can still get great results. This is because Spat Revolution has an intelligent Custom Speaker Configuration editor where a model of the sound diffusion system you are actually using can be defined and stored into the list of presets.

Open the Custom Speaker Configuration editor by clicking on the EDIT button of a Channel Based room, by the Speaker Arrangement pull down menu. All Channel Based speaker layout presets are stored, duplicatable and editable in the Custom Speaker Configuration editor.

Spat Revolution can accept real world measurements which you have entered manually, and can save this system as a speaker arrangement preset to be used in all Channel Based contexts, such as simulating that exact physical system in a virtual room, binauralising or transcoding onto that channel based system from an Ambisonic source.

To create a custom preset, first of all, make a NEW or DUPLICATE an existing preset from the menu. Add , Delete and Move speakers. Importantly, LABEL speakers. You can enter Angles, to map the model in Polar space, and Spat will calculate Cartesian distances. If you have X,Y,Z Cartesian co-ordinates measured from the origin of (0,0,0) at the Listener Position, then Spat Revolution will take care of the polar co-ordinates.

In addition, it can also use the measurements to compute the optimum delays and gains for better spatial results on a custom speaker configuration. This is an advanced speaker management technique made easily accessible by a single press of the Compute Speaker Alignment button.

When you have defined a custom speaker arrangement and press this button, Spat revolution will create virtual speakers for the ones that are not at equal distances to listener. This becomes important when using speakers arrangements with sweep spot centric panning methods as the algorithm will try to ‘fill in the gaps’ and work out the best speaker weighting internally that will normalise and balance the sound field towards an optimum decoding for the speaker and channel based format being actually used.

The Normalise button is also useful, as it will remap real measured distances into a normalised ‘absolute’ distance measure that should improve the perception of virtual sources’ Distance variable which is calculated as a simulated distance measure between listener position and virtual speakers in a channel based configuration.

Before Alignment Compute

After Alignment Compute

A detailed tutorial on advanced scripting of Custom Speaker Configurations using the Python language is available on line at the Flux:: support website.