AXT Systems

BIM-2 Balanced Summing
BIM-2 Module
This module takes the balanced stereo pair as XLR inputs and uses the SSM2141 line receivers to create a single unbalanced signal for each channel.

These two signals are then electrically summed and buffered using an NE5532 device.

A trimmer allows adjustment of up to around 8dB of gain to compensate for the summing network losses.
To calibrate this, apply the same signal to both inputs at 0dBu and calibrate the output of the summing module to 0dBu.

The module is powered with +/-12V to +/-16V rails. A PSU-12 power supply is ideal for this.