How to connect this speaker to Raspberry Pi 3 model b+
I have a PAM8302A amplifier.
Bluez and pulseaudio works?
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I'm looking at a similar project myself, so I will share what I know.
It looks like it has no power, so you are going to need an amplifier. There are a lot available. One example (what I have waiting to complete the project) is a simple mono audio one like this one by adafruit. It seems to often be recommended that amplifier will need it's own power as well.
Here are some examples from adafruit to hook up an amplifier.