ProtoDAC TDA1387 X8 project

[Skip Pack]

The volume increase from turning CDSP off and ALSA polarity inversion on was much greater than I expected. More  tests to come.

@DRONE7, @varunach, @Skip Pack

I notice it too, but really more at lower volumes IMO. Could it be as simple as CDSP uses a different volume curve from ALSA? For example, Spotify Connect offers Logarithmic, Cubic, and Linear as volume curve options.

I guess my concept is that the dynamic range should not change with volume -- if you adjust the volume (using software or hardware) from one player configuration so it matches the volume from another configuration (CDSP on versus CDSP off) they should sound substantially identical to our ears volumewize. there will be differences from the dithering and other effects. If there seems to be a 'contouring' effect that leads me to think of a loudness profile.