There is little information on this, but I can hardly imagine that it goes beyond the usual 20-20000 Hz, if at all. The sub is specified from 30 Hz, so it certainly won't reach 20-30 Hz downwards. I have read something about the 4th gen. up to approx. 20000 Hz. This will certainly not be easy with standard audio equipment.
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Sorry, I know, not a constructive answer: I couldn't even stream Apple Music reasonably to their Homepods. The reason I switched to Echo, only to find it wasn't the speakers. However, I could stream via Bluetooth, just not stable. Connected the Echo as a Bluetooth device. Then I went to Spotify. Everything just worked there. I'm sorry to say that I've been struggling with Apple Music's connectivity problems for a long time.