Networked stereo - Hmm interesting
That's the bit that caught my attention.
I've looked for, and never found, a pair of quality Bluetooth speakers that can do stereo without a wire connection between a 'master' and 'slave' unit.
Ideal scenario is one speaker plugs into the wall socket on one side of the fireplace, the other into a wall socket on opposite side, no connecting wire. And/or they have a 10 hour battery pack inside for true portability.
One of the issues with wireless stereo is wave coherence - they need to be in sync to a very tiny proportion of a second or stereo image will be weird.
Many moons ago I had a pair that connected L with R via an analogue signal over the mains (like the old phone line extenders). That actually worked well.
So how did Sengled solve it?