The smallest speaker in the history of the channel. Bluetooth controlled, 2 x 3W. I have always been skeptical about passive membranes, but I was very positively surprised. The bass for such a small thing is on a decent level.

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Links to parts (speakers are compatible, I haven't found identical ones)

Amplifier : https://www.banggood.com/custlink/v3v...
Speakers: https://www.banggood.com/custlink/mmD...
Passive Radiator: https://www.banggood.com/custlink/mvG...