Thank you for the response.
I ended up returning the Classe CA-2100 amp as it had a manufacturers defect. The RCA Mount for the Left Audio-In was misaligned slightly. The toe-in was slight, but was enough to require pliers to disconnect my ICs (AQ Cheetahs, which were not inexpensive).
Took the amp back to Definitive Audio, who compared it to their other CA-2100 in stock. They both had the defect. Definitive was kind enough to let me do a DOA return, and they are advising clients that the Classes need to be run as "balanced only".
This was a shame, as the CA-2100 had a great sound. Unfortunately, both of the preamps that I own only run unbalanced RCA, and the thought of possibley destroying my ICs simply made keeping the Classe impractical.