From a Wilson Audio email:
The Wilson Audio Acoustic Diode™ Upgrade Kit
We are excited to announce that you can now upgrade your Wilson Audio loudspeaker Spike Assembly to the new Acoustic Diode system. Wilson Audio is now accepting orders for Acoustic Diode Upgrade Kits ($3,200 MSRP). Current thread sizes available: 1/2"-13 (all current Wilson Audio speakers) and 3/8"-16 (most retired Wilson Audio speakers). More thread size options to accommodate a variety of loudspeaker brands are coming in Q3 2021.
More at this link:
https://mailchi.mp/9a7a040e10c3/the-...0?e=9adf20fb1e