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[Iacopo]

a very high AMI, very low-CM top (like one of yours) on a pedestal on a soundboard might be worth a try. Might have to limit tip orbiting to keep the pedestal base small enough to make good sound, though. On it.

I tried using the back of my guitar as soundboard, but my tops are too silent. Spiked tips are quite silent.

[Iacopo]

But I've still seen wobble due to intentional pure couple unbalance without tip sliding that I could see.

Are you sure that that couple unbalance is pure ?

[Jeremy McCreary]

Are you sure that that couple unbalance is pure ?

Yes, quite. But maybe I need to watch the tips with a magnifier.

[Jeremy McCreary]

I tried using the back of my guitar as soundboard, but my tops are too silent. Spiked tips are quite silent.

My fine tips are pretty quiet, too.

If you're interested in a top that makes sound with its tip (as opposed to whistling or hissing), you might try a "textured" or ball tip. Many of my tops are built around through-going splined central axles like the dark gray ones below. Longer axles have both of the terminations shown, one at each end.



In forming my tips, I usually cover the lower end of the axle with something smooth like the black 10 mm ball below. Ball tips like this make interesting sounds on suitable soundboards -- e.g., the lid of a large empty plastic bin. When the bare axle is the tip (right), the sounds are both louder and more complex -- in part, because the way the top travels across the soundboard also changes.



Details on these fun little underhand tops here.