Coming from DT770Pro 80 Ohm (10 Years old, but with new earpads every 2-3 Years - last time replaced a Month ago) and Topping DX1 as DAC/Amp I bought a Month ago, i wanted open Headphone.
Recently started to use EqualizerAPO/Peace with Oratory1990 profile for DT770Pro, it took a very short time to adapt to his Target - it was strange first few Minutes, but after an Hour i disabled EQ and that was worse, so for a week or two i use EQ with DT770Pro.
Bought HD560S few days ago (126€). Manufactured 08/2024 per serial Number.
No complaints, no percieveble Channel imbalance, cable lenght (1.8m) just right for my use, Headband clamp not an issue for me (well, maybe after 2-3 Hours a 10min break do make a difference, but nothing serious and not different in that regard to DT770Pro). My Head is L size in Motorcycle Helmets with 59.3cm circumference if that helps to others, adjusted Headband to 4 clicks from max extended to have good fit with HD560S.
Without EQ, 1-2 kHz range (closer to 1 kHz) is whats bothers me (too much and i can't fully accommodate to that even after a while), highs are OK, bass is lacking but not much.
Tried Oratory1990 profile and immediately felt relief in 1-2 kHz range. Since im 52, after a while, decided to turn off HSF (-1db @ 10 kHz) and that is better for me. Then, felt there is a little too much bass, not in ammount, but in clarity, thought it can be clearer. From 5.5 to 4.5db solved that for me. So after a while, blindly sweeped 105Hz LSF and after a 10 or so attempts, always landed between 4.5 and 5db instead of 5.5db. Adjusted to 4,8 just because I can

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Great Headphone, so is DT770Pro with EQ when closed Headphone is needed.