Do you hear the difference between single end and balanced connection of that Stack? I suppose activating TrueBass and XBass together isn't a good idea because Zen Dac is designed to work in fixed mode when connected to AMP as Dac only. In that case the Zen Dac works as not the greatest pre-amp what distort the sound.

I kind of think iiWi Reviews says about laid back of midrange and relaxed sound overall. Equal opinion I heard from another guys. I am afraid the relaxed sound isn't good for the mostly neutral Sundara (and Ananda as a big brother).

I like "Blade Runner 2049" soundtrack and movie as well. Sundara does rumble too.