Hiss noise from speakers

Thanks for all of the responses. I went to my dealer and listened to Classe & Krell - both of which exhibited some noise fromt he tweeters of B&W 803. I suppose I willjust live with this - not a big deal since I can't hear from my listening position.

Don't put your ear up to the tweeter.

"Doctor, It hurts when I do this."
"Don't do that"

All electronics have some noise. If you have to put your ear to the tweeter that is normal with the volume turned up or a tube piece.

Air leak-have your speakers sealed.

I think this is a very common thing. I can't think of a rig I've assembled in which this "hiss" didn't exist at some level. The degree varies from preamp to preamp. It was a big problem with an Exposure preamp I had, which was a really great preamp in spite of it. I was told that a common method to reduce it is to place caps on un-used RCA inputs. I just decided to quit worrying about it instead.

The problem is not exclusive to separates -- integrateds and receivers do the same thing. As Aball said, it is pretty common. That said, some preamps are more noisy than others and many times the noisier ones sound better (but not always). But if I had to choose, I'd pick a moderately noisy piece that sounded good over a quieter piece that sounded worse. Perhaps you will find a quiet preamp that also sounds good...

Just to further complicate things, consider that the noise could be from any piece of gear in the front end of the system. Try the preamp switched to an input that has nothing connected to it and see if the noise is the same. If it's lower, then the noise could be coming from your source component and not the preamp. Also, some audio cables exhibit more hiss/noise than others...

I can only hear it when my ear is next to teh tweeters. And, as mentioned, only when pre is on. Don't hear it when only amp is on. So, this is common among separates?

I think you are simply hearing the background noise of your amps. If you can't hear anything from your seating position, I wouldn't worry about it. Many amps do it.