Here are all the changes Apple has made from the original HomePod to the HomePod (2nd generation).
After two years of updates, the HomePod mini is actually pretty good
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The all-new HomePod delivers groundbreaking, premium sound, from clear, detailed highs to deep, rich bass. Advanced computational audio pushes acoustics further. Spatial Audio provides even more immersive sound. Works seamlessly with all your Apple devices. Connect and control your art home, privately and securely. Premium, immersive, high-fidelity audio. Powerful high-excursion woofer delivers deep, rich bass. Five beamforming tweeters for clear, detailed highs.
Apple HomePod 2nd Generation, White