SolidState, Axiom is not using the B&O Ice module. Axiom has evaluated it and decided to design its own digital module to overcome many shortcomings of the Ice module. Axiom not only has designed its amplifier modules in house it also manufactures it in Axiom's main Canadian facility.
To recap on the XLR pins :
Pin 2 is Hot + and Pin 3 is Hot – while Pin 1 is ground.
Hum :
The A1400 should not have hum either way. The only way this may happen is when Pin 2 is hot and Pin 3 is not connected or to a different ground than Pin 1. We do not recommend this as the A1400 has different circuitry for the unbalanced and the balanced inputs. The balanced inputs stay balanced all the way to the power stage.
