THE SENNHEISER HD600 HEADPHONES THAT JIM GAVE ME. 

Glad you like them Ian. I'm looking forward to where you take them . Thanks for everything my friend. ⭐🫶💙 Jim🏴󠁧󠁢󠁳󠁣󠁴󠁿🙂

i have a set if hd580 and my brother has a set of the hd600 i just done a side by side comparison between them over the past couple of weeks and to be honest didnt notice anything different i even changed the cables between them both ..hd600 thicker cable, so waiting to find where you get upgraded bits from