I’ve just contracted support with this very question:
I have input into the TRS and the XLR, I can only get the TRS working. Am I missing something? Source for XLR is Numark Scratch Mixer (which vinyl signal is coming through fine) and source for TRS is bluetooth receiver. Am I restricted to only one input? I've not got them playing at the same time but do I need to unplug the TRS in order to use the XLR?
The response was not at all what I had hoped for (and annoyingly, the presence of more than one input actually made me choose this sub over others!):
Thanks for getting in touch and sorry to hear about your issue with your device.
Using one XLR input and a TRS input at the same time would be an unsupported use.
I would advise using either two XLR or two TRS.