On the D1 I know it uses one slot for the DAC aspect, so you could slot in like audio-gd HDAM or something like that.
As the D2 has no headphone output or anyhting like that and I wanted to put the HDAM in, do i need to replace all 3 ? or just one for the tube pre-out? :)
I have a friend that wants to get a D2 as a D1 is not needed and wanted ot know if the upgrade path I followed can be done the same.