I would hope that the 990's internal design is unbalanced and that the unbalanced part of the circuit is available on RCAs, bypassing the electronic balancing part of the circuit for those who do not want to use the balanced feature."
What are you taking about? You CANNOT have a balanced "signal" on RCA's. To say or even suggest a balanced signal may be going down an RCA is obsurd and laughable at best. IT SIMPLY CANNOT. There aren't enough wires in an RCA to support "balanced".
XLR's have TWO wires for signal transmission and a third wire for reference whereas an RCA has ONE for signal and ONE for reference.
The "balancing" is typically nothing more then a op-amp which creates a copy of the signal with the phase shifted 180 degrees.
There are TWO signals going down the XLR - The normal one and the copied inverted one. From those two signals it is very easer to detect distortion on the receving end - differences are rejected.
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