I own one single HomePod Mini that is fine for listening to music in mono. If I were to purchase a second unit, I'd be able to play the same music in stereo. If I were to upgrade to the non-mini version of the HomePod, the experience might be even better, but I fail to see how one or two HomePods can possibly equal a true 5.1 sound system. For those of you old enough to have experienced quadraphonic records or tapes back in the 70s, would you be able to play any of that old media on a couple of HomePods? I don't think so. But I can certainly play my quadraphonic and 5.1 music library on my 5.1 Home Theatre. So, what's the edge of the HomePod for muti-channel playback? Mere presence? Some reverberation? That, in my book, is nothing more than stereo with airs. Please, enlighten me if I'm mistaken.