I do not have the HD600, however it is known to be hard in the treble (reputation and curve) and looks like the HD560S for their clear sound (I can already imagine the peaks in the treble) (I can't stand it)I also didnt like the 560s sound compared to 400se , but compared to 600,650,660s to my ears hd6 line is better more natural organic , i dont find HD600 aggressive at all, have you use them recently? Its really strange because my 600 new clear rings doesnt sound aggressive at all. But i understand that everyone has different ears.
At the end HE400se are like u said value for money ( if u have the equipment already to run them) .
You should try HD660s or S2 these are clear upgrades in my opinion.
Amir says they are similar to the HD600 & HD650 so I didn't try the adventure with the HD600.
As my photo indicates, I only have the HD560S, HD650 and Hifiman He400se. I make comparisons quite often and it's the Hiiman He400se that comes out on top in my ears.
The HD650 has the best resolution or organic .. but it is less well balanced compared to the Hifiman that you can leave on your head all day. It's absolute comfort in terms of sound, weight, tightening, pad etc. 0 aggressiveness, just peace and the end of the party helmet for my case ..
I'm sensitive to treble because it makes the sound aggressive .. which is not the case with the Hifiman he400se, it's the perfect balance, no need to look for more than that. We sit down and enjoy with our eyes closed without the ear being attacked (calme) .. no need for EQ compared to the Sennheisers, that's where it wins out.
The 560S is the most dynamic, with a dry bass .. (perfect) unfortunately without EQ, the treble spoils everything and tires in the long run.
The HD650 is a good headphone, it is posed like the Hifiman he400se.. more resolute but it is too dark with a slightly wet bass compared to the 560S and Hifiman which are cleaner (faithful)
For me: Hifiman HE400se (balance) > HD650(dark) = 560S (light)
The sound breathes and is less suffocating on the Hifiman (less agresive) it's the big winner for me .. no gene in the long term (relax).
PS:Associate with the RME ADI 2 DAC I specify, because it is not easy to feed correctly
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