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NEW PRODUCT – Adafruit I2S 3W Stereo Speaker Bonnet for Raspberry Pi – Mini Kit « Adafruit Industries – Makers, hackers, artists, designers and engineers!
gpio - I2S Recording combined with I2S Playback - Raspberry Pi Stack Exchange
I2S 3W Stereo Speaker Bonnet - audio module with 3W stereo amplifier for Raspberry Pi - Kamami on-line store
Technoblogy - I2S Speaker for QT Py
CES: Conexant ultra-lower power I2S audio codec features integrated DSP - Embedded.com