Speaker hiss on AV reciever

[Ivan]

Well the title tells most of the story..

I have a big AV reciever, 750W continuous output (yay!)
The surround speakers are OK, but the front ones are hissing a bit. Not at a level that most people will notice but i can hear them at about 1m on normal volume levels when there's not much ambient noise. (For an indication of how loud that is for the average person.. i can hear the head motors of my DVD at 2m distance while the thing is behind the closed door of my audio enclosure)


Anyone has a clue how to solve this.
The front speakers have been working 100% for a few years already, and the cables of these are a bit on the old side and too long for the current setup,.