One set of controls, three lenses on the same scenario. Set the earbud tech and latencies, then switch tabs to see it as a latency stack, a concert hall, or an arena. Flip Auto-Sync and watch all three lock into perfect lip-sync.
Acoustic wavefront (343 m/s)L/R SR arrays + backlineDelay towers (concert)Earbud audio — all seats at onceListener
Nearest seat (PA)
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Farthest seat (PA)
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Acoustic spread
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Earbud (every seat)
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Selected seat
Click any seat dot to inspect its timing.
Earbud technology
FCME works with standard Bluetooth — reaching ~every earbud in the house. An Auracast-only solution reaches just ~25–35% of earbuds (the AirPods base excluded) — about a third of the room. FCME can also use Auracast, but Auracast needs dedicated transmitters and is one-way; FCME Secure Wi-Fi Multicast runs on proven Wi-Fi APs and is two-way — enabling screen selection, polls and interaction with every listener.
Every guest's earbuds add a different latency (AirPods ~120 ms, SBC ~160, LDAC ~240, gaming buds ~55). No single offset can sync them all — so FCME adjusts the delay per listener, at each endpoint. Turn on Auto-Sync to watch them converge. The earbud floor is the slowest device present — you can't pick guests' earbuds, so the toggle above is superseded; FCME's lever to shrink it is its own Wi-Fi multicast latency.
Co-located live event: the display is delayed to sync earbuds — ideally to the audience centroid, never below the slowest earbud's need. A deliberate optimized delay can enhance immersion. Seats ring green→red by mismatch to the live room. Remote venues have no such constraint.