Originally Posted By: ClubNeon
Just to clear up for those of us playing along at home.

What makes the A1400 pick the different circuitry when it only has one physical set of inputs?

Hi ClubNeon,
The input jack used by Axiom on its A1400 amplifier models is a dual type configuration. The larger central hole of the connector is for the phono type connector and the outer three identical small holes are for the XLR connector. It is like using two separate connectors. Only when an XLR connector is plugged to it that the audio signal will be processed by the balanced circuits.

jc