Persistent hiss coming from Boston Acoustic CR-5 speakers attached to Sony STR-DE135 stereo receiver
I'm trying to eliminate the "hiss" sound coming from my stereo system. I currently have a Sony STR-DE135 receiver connected to Boston Acoustic CR-5 bookshelf speakers. Every function-- CD, MD/Tape, Tuner, TV/SAT, and Video--hisses. When I play music, the hiss underlays the audio. Kind of annoying. I've cleaned the receiver as best I can, and swapped out the old speaker wire for new RCA 18-gauge full copper stuff. Any solutions out there?