Combining different acoustic computational approaches has been practised for decades. In this study we introduce an industrial application of method combination, where a wave-based approach with the discontinuous Galerkin method is used for simulating the lower frequency bands and a hybrid geometrical acoustics method of the pressure-based image source method and stochastic raytracing is used to simulate the higher frequency bands. The industrial application was designed with accuracy and user friendliness as the main criteria. To verify the accuracy of this method combination, a round robin study from PTB Institute is presented as a benchmark case for comparison. The findings from this benchmark study will be explored, as well as a discussion of the challenges and successes of combining these wave-based and geometrical acoustic approaches. Results are compared for T30 for a single receiver as well as for T30 distribution over multiple sources, and the presented method matches the measurements to much greater accuracy than other industrial solutions.
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