Congrats Rinpoche for your preliminary selection.
Just in case Angie does not have the Rowland M625 S2 Manual yet, you can quickly download it from my Dropbox public folder....
https://dl.dropboxusercontent.com/u/53640097/JRDG_M625_S2_MANUAL_REVA1.pdf
Concerning preamps / linestages, Rowland currently has two offerings... The Capri S2, and the flagship Corus with external power supply. I suspect that Angie might have at have one or both of them to listen to... No worries, just like the M625 S2, these creatures do not sound shallow or solid statish *grins!*
On the other hand, I have my Rowland M925 monos fed directly by the Aeris DAC, and I am not suffering a ... in heaven *grins!
Saluti, Guido