The QOL is very, very subtle in its effect – never deleterious, but not an “Oh my!” impact either.
Some recordings benefit more than others. It sounds good and makes for a good preamplifier/switch box with all of its quality balanced inputs and outputs, but it offers no gain.
My struggle right now is that I have no pre-amp in the system, so the AGD amplifiers are not getting a fair shake yet. I can only listen to music via Qobuz and Tidal over Bluetooth via my bluMe HD receiver w/ toslink connection to my tube DAC using my iPhone as the controller because my CD/SACD - DAC combo offers no gain control.
That said, the AGD’s still sound pretty darn good, even with the limitations of the sources I am feeding it at the moment. Much cleaner and more resolving than the low watt, budget integrated tube amplifier they are vying to replace.
More to come…