Great responses all round.

My Sky+ goes through a 518 into the 568.2(v2.5) so that isn't the cure for my setup.

But I do have +4 on the rear channels (B&W Matrix 802s via a 557 set to large) vs the front (B&W Nautilus 802s via a Chord set to large).

I'll wind everything down and see.

In the spirit of Spinaltap, I would like to confirm that I am not involved in the corrupt theft of a global sport.