I know i have only had the units 4 days but i have noticed a fair amount of hiss coming from the speakers when quiet music or no sound is being played. I have also noticed that ther is a small amount of transformer ' buzz' coming through. ie the noise the transformer is making in the power amp is coming throught the speakers. I have checked all connections and leads etc and they are all fine. I would ask my dealer but he is not available for a few days. Possibly a faulty P1000??? Any help much appreciated Jason.