Ann: Market Update - Progress Report, page-271

They are obviously having problems and are a long way from solving the problems getting the required specs for the speakers.
As they did not say they achieved them, for the "start of demo's" to people, only that they had begun the process of doing demos.
And no reposnse from that, as obviously they didnt show much.
Still a learning technology, maybe 2023 / 2024 looks like to me, but what kind of actual sound will they produce.