What is the ACTUAL difference between the DT770, DT880 and DT990 Beyerdynamic headphones?

If you fancy buying some of our modified beyerdynamic headphones check out the link below https://customcans.co.uk/shop/product... It is the question nobody asked but should have ;) The Beyerdynamic 770, 880 and 990 all share the same driver design but have totally different sound signatures. Now... I know there are many versions of each of these headphones with impedances ranging from 32ohm to 600ohm which all sound different but in this video we will look at how they have tuned the sound of the driver an enclosure. It is quite interesting to see the differences and the techniques they have used to tune them