Originally Posted by mkaragia
Unfortunately, I can ensure you that this is within specs for the specific speakers. I have exactly the same situation, and from the research I have done when I first noticed it, it seems like Logitech just says that we have to live with it.
Yep, it's normal for these speakers and AFAIK, there's no way to completely eliminate the buzz/white noise. I initially had a set replaced because of an overly noisy right rear channel and the replacement wasn't much better. Replacing the speaker wire with a lower gauge (higher quality/thicker) helped out a bit with the noise and sound quality, but nothing spectacular. I am also using the optical input, so results may not be the same for analog. In the end, I have come to live with it and TBH, it doesn't bother me anymore. As far as the Bass is concerned, you can adjust the EQ settings in your sound properties and in the media player. You'll want to adjust the frequencies on the far left with the low frequencies under 200Hz. The Bass level can be adjusted on the speakers themselves, but I trust you've already tried that. PS: I have heard that if you're still under the warranty and you return your 680's to Logitech, they may send you the newer Z-5500's...but you didn't hear that from me.