Harman Kardon have a track record of smart speaker (powered by Alexa or Cortana) sales by now. Their newest one is to be debuted at IFA 2018. This device, the Citation 500, has some things in common with the Google Home speakers, including the ability to run Google Assistant.
https://www.notebookcheck.net/Harman-Kardon-set-to-launch-super-expensive-Google-Assistant-powered-speaker.325788.0.html