Solved.

Thank goodness I've been on this site for years and have a memory like an elephant;

I seem to recall a post many years back (from Carl perhaps?) that confirmed for whatever reason, Meridian DVD players' SmartLink 3xSPDIF likes to be on MD1.

I had HD621 on MD1 and 800 on MD2.

Just swapped them over, and boom. Sound.

My goodness I wonder how many have scratched their head over that one for weeks. Is this in any of the Meridian literature?

Andrew

800v4, 861v8, HD621, PS3 slim, analogue speakers, Anthem P2 Amplifier (2 Channel), Proceed BPA-3 Amplifier (3 Channel), 2x HSU VTF-15 Mk2 subs, 2x HSU VTF-3 Mk5 subs, 2x PSA XS30 subs.