Is the HD600 a headphone that gives a lot of detail when listening to a song?
I mostly listen to 70’s blues/rock and most of those recordings are of low quality.
Masters from the '60's and '70's used analog tape, and it' common to hear (CD transfer and Vinyl) "amount of hiss" and over saturation in the higher frequency range.
I would like to understand if HD600 will put even more in evidence all these imperfections to the point of making the whole
completely unplayable, or not.
The HD600 are relatively 'forgiving', compared e.g. to the K702s, which are an absolute no-go for low quality recordings.
But, as Jimbob recommended, you must try it out for yourself - it's your ears, and we hear differently, and our tastes differ.
Consider the relatively narrow soundstage of the HD600s, as Robbo rightly points out - but that also depends on your personal preferences. Some people like that 'intimate' sound. And some people don't even perceive soundstage as such. And some people find 'soundstage kings' like the HD800 or the K702 'overly wide'.
The Fidelio X2HR are fun headphones with a nice and open soundstage and a lot more bass than the HD600
and they are very forgiving
: they accept low recording quality
. But their bass can be boomy, depending on the recording. Some EQ helps. Huge, angled 50mm (!) drivers. Great built quality, and thus relatively heavy. (Genuin replacement pads are no more available.)
Smartphone or laptop, as dsnyder says, are indeed too weak for the Hd600s, but they don't need a particularly strong amp. NwAvGuy's Objective 2 is completely sufficient.
You'll definitely need a crossfeed filter for your old recordings.
Last not least: the best sounding headphones are worthless, if your head is aching after 10 min listening time!
You adapt quite easily to the respective sound of headphones, but not to untolerable pressure or too narrow earcups.
Sometimes the clamping force can be reduced by (carefully) bending the headband (if it's made of metal only!), so the Hd600s, or X2HR, or K702s.
Additionally, I zip-tied the leather headbands both of the X2HR and the K702 to the metal strings above them cause I don't like any pressure on top of my head...
Try some of them out, make sure you can return them.
Good luck!