Re: how is the music quality of microsoft lumia 640 in earphones ?
I use my 640 run listening to music through the aux on my car hi-fi and also out running and through the aux speakers at home when cooking. The output volume is pretty good, ok not as high a say an htc one m8, but then nothing is, but higher than most Samsung and xperia phones, the sound quality from decent quality mp3 to streaming is actually very good, clean and crisp slightly on the treble more than bass edge, but the equaliser on this and all Lumia phones is fantastic and actually makes a difference. Not sure the sound output is quite as good as my old Nokia 930, but pretty close