Bel Canto DAC-1 Audio amp circuits?

Does anyone know what type of audio circuit is being used in the Bel Canto DAC-1? Are they using discreet components or an op-amp?
They use a dual differential op amp configuration with very good Burr Brown op amps. I opened up mine and looked, but I forgot the exact model of the op amps used. One is used for the I/V stage, another for the line driver.