The warmer component will always influence the sound.
Amp will have more influence on the sound characteristic then DAC.
So, by the above logic, going from most neutral to warmth will be
DAC-10 + ST-10
DAC-10 + STA-9
DAC-9 + STA-9
Keep in mind that any among of coloration is due to addition of even order harmonics which no doubt will increase the noise floor. You can't say I want the warmth but I still want my -130db noise floor.
This is EXCELLENT advice and information.
I might also comment on a couple things.
First: I am under the impression that even order harmonics are often measured as "noise" or distortions. So don't let that fool you into thinking the STA-9, or the MCH K-38 are "noisy". Even though the specs might suggest higher noise, in operation you notice nothing of the sort.
Second: Regarding "tube like" sound of the AMPS = Please know, that in the case of these amps, tube like "does not" mean syrupy, lacking highs, lacking transparency, lacking bass, etc.
I have recently spent a LOT of time listening to the MCH K-38 in bridged mode, running a 2 channel system (currently just turning off the other channels)
The results are ASTONISHING!!!
I will soon post some of my findings, and some of you may think me "over the top", but what I am hearing is so far beyond impressive, that GIANT KILLER is not even close to an adequate description.
And Rustydoglim's assessment of mixing and matching is SPOT ON.
If you have edgy aggressive speakers, the DAC-9/STA-9 are for you.
If your speakers are less than sparkly, the DAC-10/ST-10 will light your fire.