Loosing one channel when hooking up a second monitor

I have one TS212W receiving a stereo bluetooth audio signal from my cell phone. I coax it to a second, TS212 speaker for added volume. Once connected the music switches to single channel out of both speakers. Unplug and the TS212W plays both channels.

Can I mix one bluetooth and one non-bluetooth speaker for listening purposes? I don't care if it's not stereo.
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