I measured the McIntosh C12000 with the preamplifier chassis sitting on top of the controller/power supply, the two joined with the supplied umbilical cables. I used my Audio Precision SYS2722 system1 for the measurements, confirming some of the results with the higherper-formance APx500. The C12000 has five independent outputs: one balanced pair labeled “T” for tube output circuitry; another balanced pair labeled “SS” for solid state output circuitry; an unbalanced pair labeled “Main” that can be switched between tube and solid state output circuitry; a second unbalanced pair labeled “Rec/Fixed” for sending output to a recording device; and a 1/4" headphone jack. I performed a complete set of line-input tests from the two sets of balanced outputs and from the Main output in both modes, then repeated some of the tests using the headphone output.
The Controller’s firmware was V 1.02. All the outputs preserved absolute polarity (ie, were noninverting)
