Audio Input Impedance; Audio Output Impedance - Intelix Psychologist User Manual

Psychologist Mixer User Manual

Audio Input Impedance

Any line-level audio input can be mixed and routed using the Matrix. The audio input to the Matrix
is can be either electronically balanced (impedance of 20KΩ), or it can be unbalanced (impedance of
10KΩ) by the user. The correct way to unbalance the input is to "float" by leaving the unused pin open, as
shown below.
Matrix Input
Connector
Matrix Input
Connector

Audio Output Impedance

The audio output from the Matrix is electronically balanced (impedance of 440 Ω), but it can be unbalanced
(impedance of 220 Ω) by the user. The correct way to unbalance the output is to tie one of the balanced
legs to ground, as shown below. The Matrix is designed to give a 6 dB boost (which compensates for the
signal-level loss due to unbalancing) to a signal unbalanced in this way. Therefore, this method of unbalanc-
ing is preferable to floating one side of the pair of leads to unbalance it.
Matrix Output
Matrix Output
Connector
Connector
Each output is associated with a Mini-Mixer. For example, the 8/1 Mini-Mixer set to output location
03 may control a pair of headphones connected to output number 3. The 8/2 Mini-Mixer set to output
location 10 may control a pair of monitor speakers connected to outputs 10 and 11.
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Psychologist Mixer User Manual