Very slight "Hiss"

Thank you Chatta. From a normal listening distance as opposed to pressing my ear right up to the speaker the hiss is completely inaudible. I was holding my ear about an inch from the tweeter and only at this distance could I hear hiss. There is no problem with my system, this observation was a curiosity more than anything else. I've moved on to just enjoying the music at a realistic distance.
Rpg

Every electronics device (audio) they produce a normal hiss if you hear it very close. Dont find faults in your system when is not neccesary.

Thanks to those who explained the nature of electronics and the fact that what I observed regarding "hiss" is normal.

Rpg

Very common in various audio products.

Tweeters have a slight hissing sound at "Ear-to-Tweeter" distances when the amp is powered up. This is normal. If you other drivers are "humming" this is differant and is likely a ground problem.

Elizabeth is correct. No electronics can achieve zero noise. What you guys are hearing is residual thermal hiss, which occurs in all electronics, regardless of quality or price. As long as hiss is inaudible from the listening position on the quietest music passages, there is no problem.

http://en.wikipedia.org/wiki/Thermal_noise

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I bet if you stand on your head for an hour you'll get a headache too, but why would you ever do that?

In normal use why would you ever press your ear next to the tweeter?

I agree with Tpreaves

http://en.wikipedia.org/wiki/Obsessive%E2%80%93compulsive_disorder

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I get the message - OCD!! I mean, my sweet-spot is 15' away, I cant hear the hiss there, but I was wondering if it should be silent. The source component is a Krell KAV 400xi.

Thanks
Rpg

What preamp are you using?

It is most likely coming from the pre-amp, since it changes with input selection. Some components are quieter than others. I have experienced it through the years with differnt components. Nothing I tried helped. e.g. ground changes, cable routing, component placement, etc. I know it bugs you but I think you are opening a can of worms that could ultimately cost you your sanity. Luckily I gave up before I got to the point..hee hee ha ha ho ho their coming to take me away ha ha:)

Quit pressing you ear next to the tweeter!!!