I'm still learning the in's and out's of the software but is there no speaker library with various types of speaker manufacturers or a way to populate a line array? If not how are designers building that aspect of their rig in capture?
If you wish a more realistic result in your model, you may import the 3D model of your speakers available either from the speaker's manufacturer either from free online 3D model websites such as 3Dwarehouse. A list of suggested websites with assets can be found in the following link https://www.capture.se/Support/Assets