Not the HD 599s !
Shouty, painful hard sound.
I see HD600 described as neutral, so you may experience the same thing as with 599.
HD650, that is what you may like. No treble peaks, mid tones are forward, but these are the 1-2khz ones and not the 2-3khz. So for sure not unpleasant even with high volumes.
The HD800 serie seems too with a lot of treble.
There is a newer model, HD660s. This no idea but meybe not worth the 100-150+ over the HD650. Says improves the 600 serie, which i think means there's going to be HD650 with added treble. Is there someone here tried 660s ?
What i would recommend you though, AKG 712Pro. I see new in Thomann for 188 pounds. That is going to be 1/3 less than these Sennheisers and it is smashingly good. Is open back one as well.
But 650 is going to be for sure the more relaxed and the one less treble. It may give you orientation when reading opinions. You would want something that sounds like HD650, not like HD600. These are legendary headphones.
The AKG 712pro i wrote above is worth it 100% for what it is.
Actually you could test with USB Audio Player Pro addon Morphit. There are a lot of headphones you can simulate. That is not going to present you how the real headphone sounds, but it is lets say 70% accurate, you will get idea. Since 2.16 version Neutron has this new function in it for equalising headphones(you select model and it equalize them so that they have flat and neutral response). You may check in it too, it does different thing than the Morphit in UAPP, but some say can be made to work like Morphit in Uapp to simulate different headphones. I have not figured how to do it exactly however. You need to have graph response from one headphone and the other you want to simulate and then set the EQ so. There are not many good graphs out there, only for very widely used headphones, which the HD600 series is. So could be found and you do not need the Morphit, but is more convenient with it.
It seems to me that my Mojo stays cooler to touch if I play higher bitrate material!
Two hours of 24/192 playback and it is barely warm to touch.
Has anybody noticed such a behavior ?
Sample rate is what affect it i think. I do get less battery life when playing bit-perfect 44.1-48khz files vs more (don't know about the heat, but with less battery life it heats more, as everything working with electricity heats up). That is meybe 20min less playtime overall throughout the 7-8h of battery life. I get 1h26m vs 1h21-22min with 44.1khz from fully charged to until it goes green battery indicator. Upsampled music, blue battery inducator holds 1h26min, and bit-perfect is less with 5-6min. It will lose some on the next stages battery indicator as well and when you sum it, it is somewhere there, 15-20min less playtime with 44.1 and 48khz files.
Meybe does not affect it at all when battery is completely new, or the differences are super small like +-5 to 10min throughout 8h30min. While coaxial vs Usb will give full 1h more for example.
Or i could be imagining things. Nah, there is difference but very small one and becomes more noticable as the battery age. So i see things.