On certain settings, from certain inputs on my Sony STR-DE495 i'm getting a kinda "running water" noise from my rear speakers when using any of the Dolby Pro-Logic/Pro Logic II movie or music sound settings.

At the moment, i only have one input into my receiver and it happens on this input. It does not happen on the internal FM tuner though.

Someone else informed me that it was something to do with Pro Logic, but he didn't explain it very well at all.

Can someone shed any light on this?

My only workaround at the moment is to either use 2-channel stereo, or to use one of the special Music settings for either Concert, Hall or Jazz. I don't seem to have an option for just playing my music out of all the speakers...

A pic of my receiver can be found here to save researching it: http://hififorum.co.uk/modules/myalb...p?lid=16&cid=1

Thanks in advance to anyone who can help with this.