This is a very unique and one of a kind headphone. To my ears this is a significant upgrade from stock 650 especially in terms of separation, bass and clarity. The modding consisted of adding an extra magnet( which I took off from a 58x) to each driver. Along with that mod I did all the mods listed here( other than pad riser) : https://www.superbestaudiofriends.o...ve-appreciation-thread.44/page-88#post-296495.

This 650 is a Irish made one and will come with the stock cable as well as the box. Will also include a set of front foam if needed. Asking 220+shipping but open to offers.

Please feel free to pm me if you have any questions.