Calibration of synchronized audio playback on microphone-equipped speakers

A method of synchronizing playing of audio to a listener position, the method performable in an audio system including a first microphone-equipped playback device and a second microphone-equipped playback device, the method comprising:

• receiving by the first microphone-equipped playback device an audio stream;
• playing the audio stream by on a speaker of the first microphone-equipped playback device, in accordance with a playback delay Δt;
• and
• enabling calibration of the audio system with a first calibration sound originating at the listener position, a second calibration sound originating at the second microphone-equipped playback device, and a third calibration sound originating at the first microphone-equipped playback device;
• wherein the playback delay Δt is in accordance with a comparison between second data and third data;
• wherein the second data include a generation time of the second calibration sound and an arrival time of the second calibration sound at the first microphone-equipped playback device;
• wherein the third data include a generation time of the third calibration sound and an arrival time of the third calibration sound at the second microphone-equipped playback device.