Bought the Sennheiser HD560S after much deliberation. I considered the HD6xx, HD600, HD58x and settled on the HD560S.
Many people have said the bass is lacking in the whole 600 series except the HD660S2. I just unboxed these phones and plugged them into my FiiO Q11 connected to my PC streaming UltraHD quality - PC audio settings set to 32 bit/192KHz Amazon Music without any EQ’ing and find their sound, so far, to be quite satisfying overall. The bass isn’t extended like on Bluetooth headsets, but it’s not really lacking.
Currently listening to some Jazz, but they sound good with Electronic/ambient, 90s Rock
My appreciation to everyone on here who recommended these. They sound really, really good.
You might be disappointed in the higher versions. I own the HD560S, HD58X, HD600 and HD660S2 and tried the HD650 and HD660S at a store. I’d take the 560S over any of the others except the 660S2, which cost 4 times the price but are not 4 times better to me.