VedaUnfortunately Zetex/Qualcomm DDFA (Class D) isn't the easiest, nor is it cleanest.
The AAA 789 amp combined with a solid DAC will mop the floor with it.
Unless they invent a digital transducer with perfectly linear transfer function, it's a misnomer that you can have an "all digital" signal chain. Transducers still need a linear analog voltage waveform.