It seems the hard copy is out of print, and they are sold out of the “free” digital downloads.

Does anyone have much experience with these headphones? I am looking for similar but dont like headphones pressing on my ears. Are the quietcomfort suitable for that? Is the ultra a worthy upgrade? Is there anything better on the market now? Redddit seems to suggest that Sony ANC is superior.

I guess it’s to do with what is considered “artificial”? Carmat uses bovine pericardium to line blood contacting surfaces.

What does “coordinated” mean to you? It’s not distributing power it’s just reporting on usage.