Common Roku Support. This question is not that difficult. Every other soundbar and speaker manufacturer manages to put this info right at the top of the specs. (My email to support asking for this info has been unanswered for a week now.)
Yes I do still need further information. I would like to know the output power of the speakers in the Streambars. (The kind of information that all other manufacturers put at the top of the specs. You know, the most important parameter of any audio equipment.)
The Products and Compare pages mention it only for the Subwoofer.