two cards are nice , if you can add sim card would be even better, for simple tasks . by the way does M11 suports UHS-2 cards , i cant find information.

dont expect any miracles , there is a reason its cheaper ( not always) , there is a lot of corner cutting on those products, my hd6xx ( not blue) its simply black plastic not even finished, right from the mold. sound is good but looks like cheap plastic .keeping them just as reference point...

well it takes 5 seconds press to power it on or off , battery life is short , you cant use them as passive headphones you have to power it on , build quality - all plastic only metal part i found is screws , 3d doesn't really bring you anything , to me looks like another marketing move...

not mobius if you are going for sound quality and wire not a problem . all that 3d stuff fun at beginning , but you will get tired fast . I probably will sale mine .

I say go with HP-3 , focal not doing so well compared to HP3 with this kind of music . I own both .

check you wires if everything connected properly.

there is no link , those custom made . I would love to find something good myself

Klipsch HP 3 pretty good for classical . and you can find them for around 900 new. if you can add another 1k then Audio Technica adx5000

female A2DC ? no idea, it will be easier to find unicorn .

cable, i cant tell difference between stock and this one (6.3 variants) , but I definitely can hear difference between 6.3 and XLR