I have an SX-850 and it sounds phenomenal but it hisses, even at low volumes. I noticed that my dad's much more modern Kenwood power amp does this too. I was wondering if this is just how it's supposed to be or if I should be looking out for something broken inside the receiver. I've opened up the 850 and visually inspected all the caps and resistors but everything looks great.
Any help would be appreciated. Thanks.