Koestner 11-13-2016The "full scale" (maximum) output of the great majority of D/A converters (whether they are stand-alone DACs or are contained within a CD player or other component) falls between 2 and 3 volts for unbalanced outputs, and twice that for balanced outputs.
You are missing Al's point. With a CD player the preamp will most likely be reducing the signal to the amp, not amplifying it. Without some way to reduce the source signal everything would be one volume level, and very loud!
Orpheus10 11-13-2016
Koestner, take me to your source; the source of what ever made you say that. That thing called a volume control on the preamp that you turn up or down sets the level to the amp. But I know you knew that. If you turn it up, the speakers get loud, and down, they get quiet.
The majority of power amplifiers will be driven to their maximum power capability by an input somewhere between 0.5 and 2 volts for unbalanced inputs, and twice that for balanced inputs.
Most digital recordings are engineered such that musical peaks come close to digital "full scale" (the maximum possible digital value).
Therefore in most cases involving a digital source the preamp's volume control will be set such that the preamp's output voltage at any instant of time is less than its input voltage. And even more so considering that many and probably most users can be presumed to utilize the maximum power capability of their amplifiers rarely if ever.
That is the basis of my simple statement that:
... the preamp doesn’t necessarily make anything bigger, as in many cases, especially if digital sources are being used, the volume control will be set such that the amplitude of what comes out of the preamp is less than the amplitude of what goes into it.Regards,
-- Al