In answer to the first question about the Squeezebox, there is a setting on the player to choose either fixed level output or a variable level that can be controlled with the remote.
However, the subject has been discussed in great detail on the Slimdevices forum and the designers state there is no loss of detail as long as the volume is kept in roughly the top 40% of its range if you choose to use the variable output.
I have a Squeezebox 3 (now called the Classic) and a Duet player. Both are great and I'm satisfied with the user interface and extremely pleased with the audio quality through my external DAC. I've absolutely no urge to switch to anything else.
However, the subject has been discussed in great detail on the Slimdevices forum and the designers state there is no loss of detail as long as the volume is kept in roughly the top 40% of its range if you choose to use the variable output.
I have a Squeezebox 3 (now called the Classic) and a Duet player. Both are great and I'm satisfied with the user interface and extremely pleased with the audio quality through my external DAC. I've absolutely no urge to switch to anything else.