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Hi, mine is a uk model and I just read somewhere that uk streambar has no option to pair with wireless speakers or sub (The add device setting only allows pairing with remote, tablet or headphones). So, guess can only use it as a stand alone and no option for surround settings.
We'd like to help you further and pass your concern to our Suppor team who can best assist you with the Roku Subwoofer. To proceed, can you please provide the Roku audio host device serial number which is your Roku Streambar? To get this go to Settings > System > About.