The DAC is, but the amplifier that's after it certainly isn't. And there's no line-out, so you're effectively dual-amping any signal if you use an amplifier on

The DAC is, but the amplifier that's after it certainly isn't. And there's no line-out, so you're effectively dual-amping any signal if you use an amplifier on the built-in 3.5mm jack. In any case, I think they should have kept the onboard jack, and people who really care would continue to use external DAC/Amp stacks.