The following description shows the balanced analog audio input connection to external unbalanced and/or stereo audio sources.
An unbalanced source can be a chinch or a jack plug.
In some cases ground loops can generate humming noise. In this case use audio transformer to electrically isolate the digital audio matrix from the external device.
Connect | To |
---|---|
Unbalanced analog audio source | Balanced analog audio input |
GND | 'Audio in –' (3) and GND (2) |
'Signal' | 'Audio in +' (1) |
Connect | To |
---|---|
Unbalanced analog audio stereo source | Balanced analog audio input |
GND R and GND L in parallel | 'Audio in –' (3) and GND (2) |
Signal ‘R+' and signal 'L+' via 2 resistors in parallel | 'Audio in +' (1) |
The value of the resistor 'R' depends on the internal resistance of the analog audio source and is typically 10k or 47k.
Connect | To |
---|---|
Balanced analog audio stereo source | Balanced analog audio input |
GND R and GND L in parallel | GND (2) |
Signal ‘R-' and signal 'L-' via 2 resistors in parallel | 'Audio in -' (1) |
Signal ‘R+' and signal 'L+' via 2 resistors in parallel | 'Audio in +' (3) |
The value of the resistor 'R' depends on the internal resistance of the analog audio source and is typically 10k or 47k.