As of November 22, 2019 Velodyne has been purchased by Audio Reference in Germany. You can read a little about it and the year long negotiation on the site https://www.velodyneacoustics.com
So it appears Velodyne will be back shortly selling and servicing subwoofers.
This is great news. I have a pair of DD10+ I use to supplement my TAD’s below 40hz and have always loved the results.
My remote died (I can’t seem to locate the other one I never used) and searching around found the notice on their site.