The signal needs to be split before the soundbar into an analog signal, so the left and right can be separated. With an HDMI splitter, one HDMI output connects to soundbar, the other connects to the DAC, where the left and right audio signals can be connected to one Bluetooth transmitter for each channel (L/R), then BT transmitted separately to the subs. Theoretically it's possible, but as I mentioned, an experiment that may or may not pay off. Sounds like a fun endeavor to me! If it works, we're onto something...