Advice on Kef 2005 sound output

[admin_exported]

I have an Onkyo SR605 pumping out sound to KEF 2005 speakers with banana plugs - but I seem to be having a problem with the sound on the surround speakers - when the vocals are output there seems to be a squeaky sound coming out at the same time - any ideas what this might be and how to resolve it?

Any other advice on how to get the best out of the kit? Many thanks!

 

[Anonymous]

anyone got any thoughts? Editors? (fyi forgot to mention Im using QED HDMI cables to connect Amp/DVD/TV).