Okay, to cut a story short, I had a Sony 2-channel amp (Nothing special, cost £150), with no discernable hiss. Now I've upgraded to a reasonable NAD A/V Reciever, I have a constant background hiss that doesn't vary with volume, so low-volume is a bit annoying as can hear from just over a metre away from all speakers & headphones. Is this normal? Does your Amp hiss? What do the suppliers say about this? My supplier states this is normal, as even his £4000 top-of-range Yamaha hisses in different modes. Surely it's not asking to much for no Hiss is it? My Sony did it fine. Any opinions welcome... Dan.