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Yeah, countersunk or counterbored heads with couplers, etc. I would damp the shafts as they would have a resonant frequency and vibrate like piano wire. Interesting, but I would not brace a cab like this.
Perhaps PVC pipe over the shafts filled with some semi firm setting glop and tightened from the outside, too much work for little benefit.
Looks like socket head cap screws counterbored into the sides threaded into all-thread with couplers on the ends.
I had a pair of newer KEF Coda speakers that used long threaded rods thru the backs all the way into threaded bosses on the backs of the driver basket (woofer and tweeter shared a single basket but were not coincident). It worked amazingly well. Arrived a little loose but once snugged up it was very solid.