This is a tutorial on how to use the REW acoustic measurement program to make in-room measurements of your home theater system. This guide will teach you what you need to assemble a cost effective and highly accurate room analyzing system using your PC, free license of REW, a USB powered microphone and accessory cables. We go over the various measurement options REW offers and how to use them effectively to make accurate measurements.
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The d&b NoizCalc software uses international standards to model the far field noise immission from one or more d&b loudspeaker systems. NoizCalc takes data from the ArrayCalc simulation software and calculates snapshots showing the sound propagation and relative attenuation values towards the far field for a certain scenario with particular meteorological conditions. With these tools, the optimal sonic experience is delivered reliably and faithfully to the right ears, and not the wrong ones.
The results are displayed on a 3D terrain map showing the calculated immission on the areas surrounding the audience listening zones. This visual representation shows the actual system performance in the far field, enabling users to optimize for listeners while satisfying local noise restrictions and offsite regulations. To ensure the results are reliable, NoizCalc includes all complex data concerning the addition and subtraction of sound waves, including phase information to describe the combination and interaction effects within a loudspeaker system consisting of multiple line arrays, subwoofer arrays and delay systems.
NoizCalc models immissions in the far field according to the internationally accepted ISO 9613-2 and Nord2000 calculation standards. Ground characteristics can be set depending on the absorbency or reflectivity of surfaces, while areas with volume attenuating properties can be defined. Buildings can be included, and the maximum reflection order option adjusts how many reflections are calculated. Parameters for humidity, air pressure and temperature ensure that the correct air absorption figures are accounted. The ISO 9613-2 standard requires limited meteorological information and assumes a worst case scenario. The more sophisticated propagation model, Nord2000 enables a more precise handling of meteorological conditions allowing the user to model with prevailing wind information. d&b NoizCalc was developed in collaboration with SoundPLAN, a specialist software developer for environmental noise prediction.