Connect Multiple Speakers — Bluetooth Sync

Play one tab or audio file on multiple speakers at once. Measures each device's delay so Bluetooth and wired output stay in sync.

Chrome plays audio to one output device. This extension plays it to all of them. Pick a browser tab or a local audio file, switch on as many outputs as your machine can see — laptop speakers, a USB DAC, several paired Bluetooth speakers — and they all play the same source together. SYNC LAB — THE PART THAT MAKES IT USABLE Bluetooth speakers run roughly 100–300 ms behind wired output. Two speakers in one room then sound like an echo rather than one system. Sync Lab plays a short chirp through each output, listens with your microphone, and measures the real delay for that specific device. It then holds every speaker to the slowest one, so they land together. The measurement is per device and it is remembered, so you do it once per speaker rather than once per session. A PROPER MIXER • Independent volume, mute and solo per output • Three-band EQ per output • Stereo routing — send the left channel to one room and the right to another • Master level across every speaker at once • Voicing presets: Club, Bass Boost, Vocal, Late Night PRIVACY There is no backend. No analytics, no network requests of any kind, nothing uploaded. Your microphone is used for exactly two things: obtaining the permission grant that makes Chrome reveal output device names, and listening to the Sync Lab chirp. Each chirp recording is analysed in memory and discarded immediately. No audio is ever written to disk.