(Just a small point, if you look at my following post and at the Oratory links I provide you'll see the HD560s has loads more bass than the HD660s, loads more below 100Hz:The 660s very likely isn't the right headphone for you. It's darker than the 560s due to the missing treble spike @7k. Bass quantity is quite similar, bass extension is a little less deep. If you want to add more treble to the already v-shaped frequency response of the DT 990 you won't be satisfied with any of the HD 600/650/660 series. A full-bodied sounding headphone for low volume listening and good comfort is not that easy to find - maybe Philips Fidelio X2 is worth trying.
https://www.audiosciencereview.com/...er-hd660s-review-headphone.34755/post-1611615 )
HD560s:I'm talking about D 900 pro x, not about DT 990 pro. A typo in my message.
I've tested DT-990-250 previously and couldn't take it's treble. Was hurting my ears ))
Hard to say which would be the most neutral sounding between those two. But HD560s is probably gonna be better than the Beyer after both have been EQ'd - for instance the Beyer has an interference dip at 4kHz which cannot be EQ'd. Do what you want, but you probably can't get that much better than an EQ'd HD560s, which is a headphone you already own. Try to learn about EQ and see if you can find a way to EQ that HD560s - I mentioned Quidelix 5K to you in that other thread because you said you wouldn't be using it with a PC all the time. Anyway, good luck, this thread is not the right thread to have a deep discussion on EQ tips or other headphones that aren't the HD660s that is reviewed in this thread (albeit I responded because you did initially mention the HD660s).
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