I can't say I've ever used CadnaR (plenty CadnaA experience. Download Cambridge Hospitality Second Edition Pdf Free Software. But that's besides the point!) so I'm no authority, but as I understand it, this is a bit more simplistic compared to the others and normally used for internal industrial noise modelling.

The other two I use a fair amount each! Odeon is a more powerful and efficient tool for ray tracing calculations and analysis in my opinion. This is the tool I would use for traditional room acoustics models, to determine things like RT or SPL transfer between spaces. It also has some useful tools like reflector analysis, if you're looking at bolstering STI with early reflections from a stage position for example.

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Odeon will also allow you to set up surfaces to have sound transmission, either by way of a transparency coefficient, or a full spectrum of R values. As for EASE, this is a much more powerful tool for PA/VA or loudspeaker layout designs where you're looking at specific products.

For a start, most loudspeaker manufacturers accept this as the impartial industry standard and will almost always have EASE data for their loudspeakers, usually available simply from their websites (or sometimes just a quick tech support phone call away). (yes, Odeon has a built in library of some loudspeakers, but it's no contest on this one really) This makes it a lot easier when it comes to modelling specific loudspeaker sources in a space. There are also more useful tools for things like setting delays, or editing loudspeaker groups together. Another consideration is ease of use / learning curve. For this I will just say that Odeon seems a lot more user friendly to me. I would advise that it's likely a lot easier to learn Odeon from scratch than EASE.

But neither are too bad, and both have very good and friendly support (and in the case of EASE an online community forum for help!) Something I will also mention is geometry generation. For both cases it's a pain to do within the software, you'll definitely want to get SketchUp or something for making the geometry itself. Both programs will accept externally made geometry, Odeon through a SketchUp plugin to export in the correct format, and EASE through a built in import module within the program itself.