A:AnswerYou can absolutely play anything over Bluetooth from your phone, but one thing you can also look at is on your settings under “Music” and “Playback” test the equalizer (EQ) under different settings you may have it under something that is damping down your volume.
A:AnswerApple currently only has one version of HomePod released. Instead of creating a new one, they have just updated the hardware in the existing HomePod.
A:AnswerYes you should be able to play your music, I ask Siri to play my playlists and it plays music I have downloaded or purchased in the past. Music that was purchased or moved to my phone before Apple Music
A:AnswerYes, there is pairing process. After grouping your two homepods and identifying left and right you will be able to enjoy stereo.
Just make sure you’re prepared to limit your music inputs to what is available over airplay. This means pretty much only apple devices.