Okay, I'm new to this board, in fact I came to this board because I'm having the same problems, and I believe it to be the preamp.
I'm not a technical guy, but through common sense I have narrowed it down to the preamp. I'm getting a scratching noise when I adjust the volume from the left front channel and ONLY the left front channel, no matter which sattelite is plugged into that channel.
I have the Hollywood+ dvd decoder card, and to hear sound from it the Line In must be unmuted. When it is unmuted, an audible BUZZ (not a hiss) emanates from the left front channel and only the left front channel.
Since it isn't the individual speaker, and it isn't the sound card (different speakers did not have this problem when used with the same sound card), what else is there? It must be the preamp.
Now I've already had my subwoofer unit replaced once. Now I'm having the same problem and I must replace it (I assume) again. It is frustrating to have to do things over again, especially when shipping this monster is not cheap (almost $30 if I remember correctly).
And it has nothing to do with dust or air filters, unless the factory where it was built was dusty, because the problems were evident as soon as it was out of the box.
If you haven't experienced the same problems, great. I envy your good fortune. That doesn't mean others like me that have problems should be treated like second class citizens because we're searching for solutions. And simply stating that you don't know why I have a problem since YOU never had a problem is unhelpful, to say the least.
Klipsch was very responsive in replacing my first unit, hopefully they will be again. And hopefully, this time it will work.
Thanks for listening, peace out.
