going by what people say about the 560s and 400se, both have a transparent and clynical sound, with good soundstage
the 650 is known for being darker, more relaxed, intimate and with a small soundstage. the opposite of the 560s
yes and no ahah
i have the same type of cables for my HD 599 and my AKG K702
the end-connections are different, but it's the same brand, materials, etc
i really like them
https://www.amazon.com/NEW-NEOMUSICIA-Replacement-Compatible-Headphones/dp/B07H6L7NT6/ref=sr_1_4?crid=115TK7XN3MYZD&keywords=hifiman+cable&qid=1648891780&sprefix=hifiman+cable+%2Caps%2C559&sr=8-4
don't spend 50 or more on a 150 headphone