Bose/ZDNET Follow ZDNET:  Add us as a preferred source  on Google. ZDNET's key takeaways Bose debuts its new Lifestyle Ultra collection. The collection consists of the Lifestyle Ultra Soundbar, Speaker, and Subwoofer. Despite no backward compatibility, the built-in Google Cast is a plus. Modular home theater systems are gaining popularity, encouraging consumers to purchase products at their own pace rather than being tied down to a complete system in a one-time purchase. Bose is the latest to upgrade its modular home theater offerings, with its new Lifestyle Ultra lineup comprising a soundbar, a smart speaker, and a subwoofer. Also: I upgraded my Bluetooth speakers instead of replacing them - 5 creative ways Though modularity is all the rage, Bose isn't fully committing to giving consumers endless options for configuring their home theater. Still, the new products debut with several notable upgrades, and the Lifestyle Ultra Speaker marks new territory for Bose. Here's what to know about them. 1.…