I owned the Classe CA-2300 for quite a bit and could never hear the fan. I thought it was great, and paired it with my SSP-800 until it broke for the second time.
This was when I bought an Audionet Preamp, and performance jumped noticeably paired with the Classe amp.
The Classe amp however was outshined easily by Audionet Max mono amps. Much more speed and resolution, Easy to listen listen to. After Audionet, I felt many other amps (example JC1+) were on the warm side. I have not heard Accuphase.
My advice in general is keep the DAC out of the preamp. Just gives you so much more flexibility... and arguably a better Preamp.
This allows each componen to do what they do best. Isn't that the point of separates? :)