Mark, a good friend of mine finally took the risk to open his Denon Envaya Mini. For all those interested about the drivers and their specs (the drivers are rated at 4W btw.) but also those who want to know what kind of battery is built in and if it can be easily replaced, you must have a look at his video where he managed to tear his Envaya Mini nearly completely apart. Of course he also reassembled it again and made it work just like before:
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