Coach I think you're not getting answers because no one can tell you what you might want. Louder or quieter?
The XS is quieter (I think?) and the XR is louder. The shorter - 12 vs 16" is more roudy. I ran the 12" XRs and they are loud. I am happy about that too.
Once you decide, google them in your size and order them. I'm happy to help if you have any more questions.
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