Ok got the SBX G6 running with the AKG K702.
I have discovered one of my ears is slightly blocked, I thought they were quieter on one side and did a lot of googling etc until I came accross one post saying to swap them around on year head, which I did and funnily enough they were still louder in the same ear, EG NOT the headphones lol...
I like them, they are really good actually, I will say there is piercingly loud treble that I am not used to, smashing a window in PUBG and that high pitched sound goes straight down your spine. I might have to look into that.
Also another thing about lag on bluetooth. Well I dont notice any difference in latency and delay between these one and my Sony bluetooth ones, at all. I am wondering if that was maybe a thing, but isnt anymore?
So yes, pleased, I will say though, my old Sony MDR XB650 were still bloody good, they are now discontinued because they break, but the next model on can be had for about £60, which I think considering the marginal improvement, plus convenience of not having a wire over bluetooth....... honestly not sure the price tag of over £200 all in for this wired setup is worth it, they are better yes, £140+ quid better..... dunno. It's done now though.