OK, so I started poking around with my screwdriver. and after removing some cheapish 80's cocaine plastic I found the cables and could see left right, two seperate ground
Hooked this oldie up to my modded trends amp and now she's really singing. WOW , much faster and no congestion. everything has improved. This headphone is as good or better than my speakers now. still different. Can't believe how unheadphonish these sound. Big wide soundstage etc. Miles davis and John Coltrane are here