Dec 20, 2017
I have two System II portables which network via the SoundTouch app with my Series III speakers - one 10, a couple of Links, and a Soundbar 300.
It is my understanding that the Series II are the only portable speakers which will network with Series III speakers, which include the 10s & 20s you mentioned.
You have to hunt down the Series II speakers on eBay, etc.
FYI, the Series II portables work with Airplay 1 (although the SoundTouch app does not show the Airplay icon). But they don't work with bluetooth.
OTOH, the later Bose portables work with bluetooth, but last time I looked you couldn't link them up with 10s & 20s, nor do they have Airplay 1 or 2.