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1
512 GB microsd cards don't exist yet, so you're limited to 256 GB as far as I know.

Aside from that, any device with an SD card slot should be fairly similar.

Lots of new high end phones like most Samsung phones after the S5 lack the internal slot.

Tthey all have USB slots and you can plug lots of very high capacity storage media into those.  Just make sure you deal with OTG.

The limits I'm familiar with relate to the largest formatted partitions that are supports and largest number of songs.

That depends on which release of Android, what add-on software you have, etc. 

IME music players can become awkward to use if you have too many files.
2
While smartphones can have pretty good RMAA measurements, they don't necessarily have powerful enough output to drive your favourite headphones, especially when compared with dedicated portable media players.

https://www.phonearena.com/news/Best-smartphones-for-music-2014-edition_id56292


The loudest device on that test is only about 7 db  louder than the average device, which is very little. The conclusion from that article should probably be that there is very little difference between devices.
As what you quoted, the link was used to compare average smartphone output voltage with dedicated portable players, like those from FiiO, my intent was not providing a "buying guide". That was an old 2014 article anyway.

Click the AUDIO OUTPUT section and search through their database, That HTC (M8) is already the loudest one I can find. Most others are something like 0.3-0.6 vrms.
https://www.phonearena.com/phones/HTC-One-M8_id8242/benchmarks

Also, even hi-end phones won't last for 10 years, 5-year is also questionable. Jelly Bean is already "unsupported".

https://en.wikipedia.org/wiki/Android_version_history

Yeah the device itself should still be usable, just no app, OS or security update. But why don't just buy a cheaper, louder, smaller, more power efficient portable media player in the first place?

I remained silent after Arnold's reply but it seems that everyone misinterpreted my previous post.
3
Please review the terms hi-fi audio, hi res audio.
Please review the term placebo effect.
4
This audio business never disappoints.
When your hardware lacks MQA decoding just beat the opponents with their own weapons. Use some upsample magic and tell your customers what to hear.
digitalaudioreview mqas-missing-link
SoX upsampling the crippped in bits MQA file without restoring any origami hidden HF content to a file sounding as perfectly good as the DXD original so better as MQA!
It sure will be fun to watch the smearfilterringingblur dominating high-end business in the future :)

Is it really this easy to unfold the mess?

Remember that the whole article reads like the usual Placebophile...
5
Nonetheless, having zero amplitude at zero Hz does not constitute bandwidth to DC. Every speaker ever made has zero amplitude at zero Hz.

Right. At minimum the sound would have to be loud enough to be reliably perceived.

Most of us are familiar with how this works in practice. The most common ways that it is perceived involve displacing our bodies vertically fairly rapidly  by some means of transportation: car, elevator, plane.

I've heard subwoofers that made my ears feel like they wanted to pop, but I think that was actually more like incipient popping, not an actual pop like I have experienced by means of bodily transportation. But, I think it would be reliable, so it probably counts as reliable perception.

A fair number of the local group of ABX-ers also have very substantial subwoofers.
6
While smartphones can have pretty good RMAA measurements, they don't necessarily have powerful enough output to drive your favourite headphones, especially when compared with dedicated portable media players.

https://www.phonearena.com/news/Best-smartphones-for-music-2014-edition_id56292


The loudest device on that test is only about 7 db  louder than the average device, which is very little. The conclusion from that article should probably be that there is very little difference between devices.
7
512 GB microsd cards don't exist yet, so you're limited to 256 GB as far as I know.

Aside from that, any device with an SD card slot should be fairly similar.

I also know that 500 GB memory card doesn't exist but I think that in the future it may exist and at that time I need to buy another phone in order to insert that memory card.

Every Android phone with a microsd card slot ever made will support up to the maximum size allowed by the standard, which is 2TB.
8
digitalaudioreview mqas-missing-link
SoX upsampling the crippped in bits MQA file without restoring any origami hidden HF content to a file sounding as perfectly good as the DXD original so better as MQA!
Interesting. Though the previous article on that site about the "sound" of audiophile USB cables was funnier.
9
Nonetheless, having zero amplitude at zero Hz does not constitute bandwidth to DC. Every speaker ever made has zero amplitude at zero Hz.
10
3rd Party Plugins - (fb2k) / Re: foo_discogs
Last post by forestasia -
Trying to get this working again on a new Windows 10 install.

In Step 1 of setting up OAuth, I get this error on the console:

Quote
(FATAL) Error: Authorization Failed (401) [Is OAuth working?](url: https://api.discogs.com/oauth/request_token )

That URL seems to open OK for me in Chrome.