Same song, same moment, two rooms - and yet it sounds like a stadium echo in the hallway. Nothing is broken: each speaker simply plays the music at a slightly different time.
Where the delay comes from
- Bluetooth compresses audio and buffers it: usually 100-300 ms, sometimes more with older codecs.
- Wi-Fi speakers (Sonos, DLNA) buffer a second or two so the music never stutters.
- TVs and soundbars add processing for surround and lip-sync.
- Computer outputs are almost instant - so next to a Bluetooth speaker, the PC is always "early".
Sound travels about 34 cm per millisecond. A 30 ms difference is already audible as a "slap" between two speakers; 200 ms is a clear echo.
How to fix it
The fix is to delay the early speakers until they match the latest one. Doing it by ear works, but it takes patience, and it changes whenever you add a speaker. OmniSound Hub AI KROSS does it automatically:
- It knows the network delay of Sonos and DLNA speakers because it measures it while they play.
- For the rest it uses a short microphone calibration: it plays a sweep through each speaker, listens, and calculates the delay to the millisecond.
- While the music plays, it keeps correcting the tiny clock differences between devices, so a four-hour party stays in sync.
Tip: use any USB or headset microphone and put it where you usually listen - the delays will be right for that spot.
Try it: OmniSound Hub AI KROSS is free for 7 days on every device - Windows PC, Android and LG TV. See plans · See the app