TL Audio A3 - Manual (Page 10)

9
Line Input.
A second 3-pin XLR connector is provided for connection to a line level source. The
signal may be balanced or unbalanced, and connections may also be made as follows:
Balanced inputs:
- Pin 1 = Ground (screen).
- Pin 2 = Signal Phase (“+” or “hot”).
- Pin 3 = Signal Non-Phase (“-” or “cold”).
Unbalanced inputs:
- Pin 1 = Ground (screen)
- Pin 2 = Signal Phase (“+” or “hot”).
- Pin 3 = Signal Ground.
When using unbalanced mic or line signals, the signal ground may be obtained by
linking pins 1 and 3 in the mating XLR connector. Do not leave pin 3 open circuit, as
this may result in a loss of level and/or increased noise. Good quality screened cable
should be used, particularly for microphone or low level sources, to prevent hum or
noise pickup.
Instrument Inputs.
A 2 pin (mono) jack plug is required, which should be wired as follows:
- Tip = Signal Phase (“+” or “hot”).
- Screen = Ground.
Insertion Point.
The insertion point is balanced, with separate TRS jacks for send and return.
3 pin TRS jack plugs should be used, wired as follows:
- Tip = Signal Phase (“+” or “hot”).
- Ring = Signal Non-Phase (“-” or “cold”).