Technically, this is all pretty much over my head. All I can comment on is what I hear. So I have to take issue with the comment above that "if there was a clock output from your P05 so you can feed D05 with it, you wouldn't need external clock because the benefit would be the same." Unless I misunderstand, this seems to be saying that if you can slave the transport's clock to the clock in the DAC, the result will be the same as with the external clock. (If I misunderstood, sorry.) When I ran the P03 and D03 by themselves, of course the P03 was slaved to the D03's clock. The very substantial improvement when the GOR-b was added was over the P03 slaved to the D03.