Its normal to have a noise floor on any preamp. In this case from the last post by Shoff the noise is apparently not affected by the volume control.
So it can be the noise of the line stage and that of the amplifier. A lot depends on how quiet the environment is; if very quiet then the noise floor could be heard.
I would not worry about it unless it gets louder over time. Then I would look at replacing the 6922 in question. Until then, I suspect a new 6922 will be as quiet as the one in there now.
So it can be the noise of the line stage and that of the amplifier. A lot depends on how quiet the environment is; if very quiet then the noise floor could be heard.
I would not worry about it unless it gets louder over time. Then I would look at replacing the 6922 in question. Until then, I suspect a new 6922 will be as quiet as the one in there now.