Originally Posted by cel4145
Maybe something is wrong with your HDMI cable and it's interfering with the audio stream?
Sorry. That's just a guess. And perhaps a bad one. But I always like to check the easy stuff first
+1. Start with the easy possible problems. Could be your speakers are more sensitive and now you're hearing static (hissing) that was there before, however, not heard from less sensitive speakers. Check power cords for the blue ray and AVR. Are they touching? Do they use the same surge protection device?
About a month ago, I added an external amp to my setup. Noticed that my tweeters from all 5 speakers would intermittently hiss (loud enough to be heard from the MLP) and then the hiss would go away. I went crazy. I narrowed the problem down to either the amplifier or some type of electrical interference from another source (i.e. I checked my air conditioning units, refrigerators, micro waves, dimmers). I unplugged everything, switched out cables/power cords, ensured a separate socket for the amp, etc. For a few weeks, i was thinking about returning the amplifier because I read that capacitors/resistors that are starting to go can cause hissing in your tweeters. Finally, I figured out the cause of my problem. Every time my daughter would turn on her light and fan in her bedroom (2 stories up from my speakers/amp and certainly not on the same amp line), my tweeters would hiss. As soon as she shut her light/fan off, my speakers became deadly silent. It's just one of those things that took a long time and a lot of experimentation to figure out. Now its time to call an electrician to fix the problem.