I learned that, around the time the uptime problems began, they moved to a new server. Note this is not their own server. The thing had a hard time staying up. Then, one day, instead of Marantz America, an old version of Velodyne Accoustics' page came up. Yes, I confirmed this. Strange, but true.

Seems to be back in business now. They'll probably integrate with the new Marantz.com site in the near future -- at least there'd be a higher chance of it being kept up-to-date. :-)