Just to eliminate possibilities, check the tuners/truss rod cover, all bolts or screws. Anything loose has the possibility to create an unwanted sound. Also I suggest changing out the strings to see if another brand or set works better. Rare as they are, there can be a defect in a string that could somehow create unwanted sound. I'd try EB aluminium bronze strings. To me these strings accentuate certain registers that if after changing out, if the ring is still there, these strings may make it worse, which may be good for helping to pinpoint the source. And at a certain point it may make sense to have a luthier look at it. Just like every thing good, everything bad usually has a source, I wouldn't chalk it up to "that's the way it is" There is a fix out there somewhere, It's just staying with it and tracking it down.
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