Thank you for your inquiry. We don't recommend attempting to daisy chain speakers by connecting them in series or parallel off of individual speaker outputs. However, I do understand what you are attempting to accomplish. I'd recommend trying out your system's "Mono Decoding" feature. This will allow the same audio to be heard through all speakers. This will eliminate the stereo left-right separation, which may not be what you were hoping for, but this setting will at least get the same audio to play throughout your system's speakers.
To turn on Mono Decoding:
Press and hold the "Surround" button on the Lifestyle System remote until one chime is heard. To turn Mono Decoding off, press and hold the "Surround" button until two chimes are heard.