Adafruit I2S 3W Class D Amplifier Breakout – MAX98357A: Listen to this good news – we now have an all in one digital audio amp breakout board that works incredibly well with the Raspberry Pi! If you’re looking for an easy and low cost way to get you digital sound files bumpin’ then the MAX08357 I2S Amp Breakout is for you. It takes standard I2S digital audio input and, not only decodes it into analog, but also amplifies it directly into a speaker. Perfect for adding compact amplified sound, it takes 2 breakouts (I2S DAC + Amp) and combines them into one. Read more.
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You have to like projects where you use a big case for a big effect and look inside to see only one or two tiny circuit boards and empty space.
With speaker projects it may be more common to get the acoustics right.
Great project!