Rtings.com finally did a full review of the Bose Soundbar 700 with surround speakers and bass module: https://www.rtings.com/soundbar/reviews/bose/ soundbar-700-with-speakers-bass-module : r/bose
Bose Smart Soundbar 700 | Bose
Bose Bass Module 700 vs Bass Module 500 - Which Is Right For Your Smart Soundbar 600? - YouTube
Bose Smart Soundbars – Adding a Bass Module or Surround Speakers - YouTube