After years of the Marshall multiroom speakers being a smart-home dead end, I’m happy to report that full local control over WiFi is possible using Home Assistant’s built-in frontier_silicon integration — no cloud, no companion app, no HACS custom component required.
Some history first
This isn’t a brand new discovery, but it seems to have stayed scattered and never quite converged into a clear solution:
- Back in 2020, @elonden talked about Zound Industries / Marshall Stanmore smart speaker integration and reported no response from either Marshall or Zound Industries (the OEM behind the speakers). The thread went cold without a working solution.
- More recently, in 2025, @rabbit-aaron shared a Marshall Stanmore 2 integration approach using a Bluetooth connection.
My setup is different: I’m using the WiFi/network interface, not Bluetooth, and controlling a Marshall Woburn (original/full version). I don’t own a Stanmore 2 or other models, so I can’t confirm this works identically across the whole Marshall lineup — but if you have a different model with a Frontier Silicon chipset, it’s very likely worth testing the same approach before assuming it’s not supported.
What I found
The Woburn/Stanmore (full versions) are built on a Frontier Silicon chipset, which exposes a local HTTP control protocol called FSAPI. It’s under-documented but fully functional — power, volume, input source, and EQ presets are all controllable over plain HTTP on the local network.
Home Assistant already ships a native integration, frontier_silicon, that handles all of this out of the box:
- Settings → Devices & Services → Add Integration → Frontier Silicon
- Host: your speaker’s local IP address
- Port: 80
That’s it — no session management to worry about, HA handles it internally. Power, source selection, and volume showed up immediately as controllable entities.
Why this matters
Both linked threads show people have wanted this for at least 5 years, generally assuming Marshall/Zound Industries would either never respond or that it was a Bluetooth-only story. Since these speakers apparently all share the same Frontier Silicon foundation, it seems reasonable to expect the WiFi/FSAPI approach could work on other Marshall multiroom models too (Acton, Kilburn, Stanmore 2/3, etc.) — but again, unconfirmed by me, so if you try it on a different model, please report back here!
Happy to answer questions or share the exact FSAPI calls I used if anyone wants to explore further before the integration handles everything automatically.