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Speakers in anime? Anonymous
Im building my own audio speakers which means that I can customize those any way I like.

Are there any special speakers in any anime that I might be able to get some inspiration from?

They don't have to play big part in the anime. Something like for example there is the Puru puru pururin ringtone in Welcome to NHK, which doesn't really play any part in the story, but it is just a fun thing to notice :)