I should point out that I've never heard any of the DT880 variants but I already hate it because it's the headphone Beyer came up with that made them think they could discontinue the ET 1000 electrostatic and get away with it. I'm kidding about hating the 880, but had to take the opportunity to boo Beyer's draconian marketing.
All the above tactics are used to create the excessive bass people like these days. Driver excursion is most valuable to us planar bunch but that is a compromise in it self because you will sacrifice the HF response for the extra bass. You can increase the bass of a bass light but accurate driver by pumping more power into them and/or designing a better housing. Planars need a lot of power for the bass region but it's more of a problem with the high voltage brother.