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1
Every Android phone with a microsd card slot ever made will support up to the maximum size allowed by the standard, which is 2TB.
Are you sure about that? At least my Motorola Moto G2 claims to support only 32GB microSD max., but to be honest I've never tried it with a higher capacity.
The claims are based around maximum capacity that Windows can format as FAT32.
Using other means than MS Disk Formatter, you can create FAT32 partition with sizes of up to 2TBs.
Support for other file systems under Android is rather experimental.

To answer your question, you can put 256GB card in your G2 and it should work, provided it's formatted in FAT32
2
Every Android phone with a microsd card slot ever made will support up to the maximum size allowed by the standard, which is 2TB.
Are you sure about that? At least my Motorola Moto G2 claims to support only 32GB microSD max., but to be honest I've never tried it with a higher capacity.
3
Vinyl / Re: >20kHz content found in vinyl?
Last post by wqcr -
Just about everything produces some sound > 20 KHz. So what?
So what? I'm certain that instruments are not specifically designed to be producing sound only in audible spectrum perceived by humans. Yes, the extra frequency content could be called byproduct of their design, that however does not negate its presence.
Quote
There are practical advantages to this - capturing those extra frequencies help to retain high frequency content in case of speed manipulation of source material.
Seems relevant to almost nobody. Seems irrelevant to 99.9+% of the people who listen to  music.
Is that to be considered personal approximation, or statistically relevant result based on evidence?
4
Vinyl / Re: >20kHz content found in vinyl?
Last post by Arnold B. Krueger -
Instruments are designed to produce sound in the normal range audible by humans, not in the ultrasonic range.
But they indeed produce sound above 20k :) - https://www.cco.caltech.edu/~boyk/spectra/spectra.htm

Just about everything produces some sound > 20 KHz. So what?

Quote
There are practical advantages to this - capturing those extra frequencies help to retain high frequency content in case of speed manipulation of source material.

Seems relevant to almost nobody. Seems irrelevant to 99.9+% of the people who listen to  music.
5
Vinyl / Re: >20kHz content found in vinyl?
Last post by Arnold B. Krueger -
Instruments are designed to produce sound in the normal range audible by humans, not in the ultrasonic range.
But they indeed produce sound above 20k :) - https://www.cco.caltech.edu/~boyk/spectra/spectra.htm

Just about everything produces some sound > 20 KHz. So what?

Quote
There are practical advantages to this - capturing those extra frequencies help to retain high frequency content in case of speed manipulation of source material.

Seems relevant to almost nobody. Seems irrelevant to 99.9+% of the people who listen to  music.

6
I have a pair of M40s and a pair of M50s that I paid about $110 for back before they started trending.  I don't see any reason why I would replace either, especially given that I have Neutralizer for my Android devices and Peace/APO for my PC's.
You mean you have an M40X and an M50X? or you mean you have an M40 and an M50? The M40X is 100 dollars, the M50X is 150. The M50 (non X) is also 150. Do you think is worth the increase? (50% more expensive?)

To clarify. I have no X versions of either the M40 or M50.  Having no experience with either, I can't have an informed opinion, and I don't feel comfortable with granting an opinion based on measurements   I suspect that the M40  might work out well with equalization.
7
Please review xiomi redmi pro 128 GB version, xiomi redmi mi max 128 GB version. Both has 128 GB internal memory, support upto 256 GB external memory. Pro version has deca core ie., 10 core mediatek processor, mi max version has snapdragon 8 core processor.

Give me suggestions for above regarding sound quality.

All of you are suggesting that no phone will give 10 years of life time and so I have selected redmi note 5, redmi pro, redmi mi max phones which have superb features at lowest price. If I buy Samsung Galaxy s8 edge there may be chances of life span upto ten years but it costs very much. If I buy Chinese products like alcatel idol, zte axon there may be chances of circuit failure etc., but I have seen a number of people using redmi phones without any problems and even I have seen some people who brought Sony Xperia phones and gone into a number of troubles.

The reviews don't look awe inspiring. I can't find a review that actually measured the output and provides actual voltages or dBs. The GSMArena data seems to be limited to the acoustical output of the built-in speakers, and it is my impression that the performance of the headphone jack is more important. I can't see where GSMArena says anything about how many volts you can get out of the headphone jack with a 16 ohm load or any other load. And, I can't find any other source, either.
8
Please review xiomi redmi pro 128 GB version, xiomi redmi mi max 128 GB version. Both has 128 GB internal memory, support upto 256 GB external memory. Pro version has deca core ie., 10 core mediatek processor, mi max version has snapdragon 8 core processor.

Give me suggestions for above regarding sound quality.

All of you are suggesting that no phone will give 10 years of life time and so I have selected redmi note 5, redmi pro, redmi mi max phones which have superb features at lowest price. If I buy Samsung Galaxy s8 edge there may be chances of life span upto ten years but it costs very much. If I buy Chinese products like alcatel idol, zte axon there may be chances of circuit failure etc., but I have seen a number of people using redmi phones without any problems and even I have seen some people who brought Sony Xperia phones and gone into a number of troubles.

I'd imagine there's no correlation between price and lifespan for a smart phone, as long as we aren't comparing extremes.
If anything, more expensive devices, cramped with user friendliness and features might expect their demise sooner than the rest, simply due to the fact that more components are required for it to function correctly, rendering the device impaired in case any of them fails, as opposed to all-in-SOC designs.
Redmi Note 4 or 4X comes with decacore too - but for audio playback, quad core at 1.4GHz is already overkill. Also note, that Pro devices never come in Global variant - e.g. with LTE B20 support (important for EU users)

Internal memory poses another point of hardware failure.
9
Medium experience, what does that mean?

Previously I have used Sony Xperia live with walkman ie., Sony Xperia wt 19i and I have never such a device I mean it provided rich experience while listening to music via headphones or through external speakers. After that I have used Sony Xperia Z1 and it's audio quality was good but at very low volume.

I have used Celkon a20 and it's sound quality was very worse and I got noise while listening to music of high quality. I have even used xiomi redmi h1s and it's audio quality was also not good and it provided audio at very low volume.

Upon reviewing a number of products I think that if I want very high quality sound I must purchase Samsung Galaxy s8 edge, LG g6, HTC U11 etc.,.

Medium experience I mean sound without low volume, noise etc., but without features like hi-fi etc.,.

Issues like low maximum volume, and low fidelity due to a too-low source impedance are very real and also probable with some phones. As a rule most good phones don't add noise or have audible nonlinear distortion.

You can circumvent the low output and high output impedance situations with an external headphone amp, but while good headphone amps may not a cost a lot, they can be inconvenient with added bulk and complexity.

The Celkon A20 may be something that most first world reader's don't have a lot of recent experience with. The Celkon dual-core 1.2 GHz processor falls short of the current mainstream phones with 2 MHz quad-cores. Also the Celkon seems to  come with Android 4.2 and I've found that my low-buck Android 4 tablet can't run all of the music players that I am interested in trying.

A phone like the HTC that was mentioned earlier  with high output and what seems to be a good audio system seems attractive for music listening. Most listeners can reasonably expected to  interpret its high voltage output with reasonably low distortion as being very clear and giving a good listening experience.
10
Please review xiomi redmi pro 128 GB version, xiomi redmi mi max 128 GB version. Both has 128 GB internal memory, support upto 256 GB external memory. Pro version has deca core ie., 10 core mediatek processor, mi max version has snapdragon 8 core processor. I think that media tek processor based phones are inferior than snap dragon based phones is it true.

Give me suggestions for above regarding sound quality.

All of you are suggesting that no phone will give 10 years of life time and so I have selected redmi note 5, redmi pro, redmi mi max phones which have superb features at lowest price. If I buy Samsung Galaxy s8 edge there may be chances of life span upto ten years but it costs very much. If I buy Chinese products like alcatel idol, zte axon there may be chances of circuit failure etc., but I have seen a number of people using redmi phones without any problems and even I have seen some people who brought Sony Xperia phones and gone into a number of troubles.

I think that no other company are providing such great features at lowest price with great endurance.