Hi Michael,
"Just on aother point trevor while i notice. you have your centre speaker by wired. do you notice any improvement of just using 2 core? Just i have the B&W HMT 62 which has the four posts but only have L & R on the back of my Onk 806."
I had the centre speaker by wired from new, so cannot compare. But in the past have done so on my stereo systems, and find an improvement to the musicality, not great, but enough to be pleased with the by wiring.
Do so as a matter of course nowadays. Have all my fronts by wired as well as the left and right by amped with Kimber 4TC to the mids and QED SA everywhere else in the system.