I was finally able to setup my Fire 7 Tablet (2019) as a network player for the Amazon Music HD service and it works great.
Pros:
- Excellent sound quality (but HD only, see below)
- 16/44.1 unaltered streaming direct to USB DAC (with OTG adapter)
- Gapless playback supported
- Full remote control from Amazon Music app run on your phone or another tablet
Cons:
- No Amazon Ultra HD (Hi-Res) support
- Occasional network connectivity issues, causing slow response/disconnects from remote app
- No Alexa support for music playback
In general, I would say for $30 it does its job wonderfully. Note, when I connect the tablet to the DAC and try playing back tracks in Ultra HD quality they will be indicated as "HD" at the now playing screen in the app and shown as 16/44.1 by the DAC. If I play back same tracks directly on the tablet it shows "Ultra HD" icon but tapping on it reveals the track being resampled to 24/48 kHz. But it
does not try to stream in Hi-Res and then resample it in the Android audio stack on the tablet when connected to the USB DAC. Smart enough behavior, I would say. Since I am not that interested in Hi-Res, I find it a useful interim solution. I have software volume set to maximum in Amazon Music app on my phone and on the tablet and using DAC remote to control volume. I
assume this gets one as close as it gets to bitperfect streaming, CD quality. At least it sounds great and pretty much indistiguishable from my Allo USBridge, which is 5 times more expensive (but still dirt cheap compared to the likes of Aurender, Naim, etc).