Many thanks for the information. However, the "Measurements" section of the same Stereophile article you cite, suggests that the "ref. 11V" that appears at the beginning of the article is a typographical error.
Compare your quotation:
"S/N ratio: 100dB ref. 500mV unbalanced input, 20Hz-20kHz; 103dB ref. 11V balanced input, 20Hz-20kHz"
with the statement in the Measurements section:
S/N measured 99dB (unweighted) over a bandwidth of 22Hz-22kHz, 82dB (unweighted, 10Hz-500kHz) and 102dB, A-weighted (all ref. 1V) for the line stage."