My whole setup is described here:
My setup provides audio throughout the house for casual listening -- listening while making dinner, lounging in the living room, relaxing in the back patio spa, or having people over for a drinks and fun. I have built and configured it for the ability to move music from one area to another, or to group different areas together to play collectively. It has replaced a similar Sonos setup that I ran for over a decade.
Sound quality is important to me, but within the reasonable bounds of the type of listening I am pursuing. I primarily stream flacs from my home NAS, as well as stream from...
But to summarize the subwoofer part of it:
I am using a separate Pro+ to run a subwoofer. One Pro+ feeds my full-range main speakers, the second Pro+ feeds the subwoofer. The two Pro+ devices are a group. It's a little fiddly to set up and grouping needs to be more "persistent", but once that's done it works quite well. I'm actually surprised more people are not using the Mini, Pro, or Pro+ in this way -- they are affordable, network-linkable sources that can link and integrate speakers (full range or subwoofers) across your home, regardless of location, without concern for line-level or speaker-level connections. It's the core function of the Mini/Pro/Pro+ in my opinion.