These MR 825s are far from ideal speakers for an acoustic act, compared with what's available today, but, yes, they will certainly get a lot louder than the PR 12s. They also will perhaps sound somewhat better than your PR 12s in the same signal chain, but unless you use lots of EQ on them, JBLs of that era have an edginess to their sound.
Don't pay a lot for them, if you decide to buy, as this would be a step up in the loudness, but not necessarily the quality, of your sound.
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