If you plan to use them a lot with mobile devices I would go for the 32 Ohm version, if you are always using amp with them then I would look for highest impedance knowing Beyerdynamics.
It's a mixed bag. It's mostly amp, but sometimes laptop. I have a Lenovo and once asked in support forums about the impedance of the headphones output, it was impossible to get that info.
I went through a huge amount of "headphones impedance" blogs, topics and forums, but to me they all look like the author is saying "oh, look at me, look at me, look how much I know and it's this formula, and that formula and it's all very complicated and you shouldn't worry your little heads with it... and hence, you should be careful how you match it"
No real help. This would help a student or someone trying to fully understand it or who plans to keep changing both amps and headphone all the time so he needs to constantly recalculate all those parameters.
But I have one amp. That amp is a given for a long time. Finding a table that would say "for source impedance of so and so, choose headphones with impedance of so and so" is non existent.
If I plan to occasionally plug them in my laptop, would it be better to choose 32?
Or better yet; which combination would be less bad - 32 ohm on the said amp (specs above) or let's say 250 ohms on a laptop?
