Firstly i'd like to say i am an avid reader of the forum but in no way an expert, in fact i am probably a n00b. now i've got that out the way here is my questions.
SMSL SP200 (RCA In )
SMSL M400 (RCA out) (Optical in)
Audio Engine D1 (superseded)
Sebaj PHA-2 (superseded)...