No this thread is not related to the hiss you're hearing. Good job
finding it, though, I looked for this thread a few weeks ago and
couldn't find it!!

The hiss is the "noise floor" of SB. 2 ideas to help: 
1. Use an external volume control like active or passive preamp or
Endler attenuating resistors. You can find a link for them by searching
this forum. If your amps have a high intput impedence you can use a
passive volume control like CIAudio or Placette which are very
transparent.

2. Dim the display brightness, or set it to OFF except when using it.
The display puts out RF which come out the right channel analog output.


Turning down the SB digital volume control will not effect the gain in
the analog output stage where the noise is, it only affects the
"amplitude" of the digital stream before it goes to the DAC (as
discussed partially in this old 2005 thread.) You want the SB volume to
be maxed so that the S/N is always at its highest. Use a true analog
attenuator to adjust volume after the SB analog output.
Merry Chirstmas!
Rich


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richidoo
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