how to stop sss noise on speech

[psalliss]

how do you stop the ssss noise on speech? seems to be more prevelant with sky than blu ray.
running keff eggs as centres and a kef 3001 centre with a onkyo sr705 reciever.

is it the tone on the amp needs turning down or its just a failing of the reciever.

 

[psalliss]

thats the one couldnt remember what it was called. any ideas how id do that on the onkyo