I'm currently using DT 177X Go and DT 1990 Pro with SMSL SU-8 DAC and SMSL SP200 THX 888 amp.
I used to have Sennheiser HD8 DJ headphones, which had extremely powerful sub-bass. But no amount of EQ'ing could fix their very recessed midrange and upper midrange. I just want headphones that have that powerful low end that actually vibrates through your skull at loud volumes.
The DT 177X Go and DT 1990 Pro can't do that, instead they start to "complain" at loud volumes. They start rattling from being driven beyond their design limit. So I have to reign in the sub-bass in order to enjoy music loudly, which is very disappointing. There's no excitement to the bass because of that.