Update: it seems to be on the open D string, but not a stopped D on any other string in any position. Even after all the above, since the last post, it was still ringing. To work on some arco, I put a set of Bel Cantos on, which have marginally higher tension than S42 Spiro Weichs at the standard 3/4 mensure. My bass seemed to "focus" a little better with the added tension, and really narrowed the resonance down to the open D string.
Here's the kicker: I recently played a gig with a rather warm stage. Every guy in the band was perspiring, and I had a brown washcloth with me to keep everything wiped down. I don't know why, but on a whim I stuck it part way in the lower part of the G side F hole. The resonance all but disappeared! But not at the expense of damping the projection of anything else! It's now about as even in its response as one can expect for a CCB.
Go figure....
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