Hi Zephyr, I have no experience on the combo units at all... My findings are based on K01 only.... By logic only I imagine that if you set filters on D-02, no filters should be set on P-02... But it might be best for you to consult Integra/Esoteric tech support on this.
On K-01 I much prefered the resolution, spatiality and the overall musicality of 4X upsampling over 2X... And I preferred 2X over no upsampling at all.
On K-01 I much prefered the resolution, spatiality and the overall musicality of 4X upsampling over 2X... And I preferred 2X over no upsampling at all.