TL Audio PA-1 - Manual (Page 6)

Outputs.
The outputs are via balanced, 3 pin male XLR connectors. The mating connectors
should be wired as follows:
- Pin 1 = Ground (screen),
- Pin 2 = Signal Phase (“+” or “hot”),
- Pin 3 = Signal Non-Phase (“-” or “cold”).
If an unbalanced output is required, pins 1 and 3 should both be connected to ground.
The unbalanced jack socket outputs should have mating plugs wired as follows:
- Tip = Signal Phase (“+” or “hot”).
- Screen = Ground.
The nominal output level switch, located next to the balanced outputs, changes the
gain of the output stage to provide optimum signal to noise ratio and headroom when
the Pre-Amplifier is connected to professional equipment (+4dBu nominal) or semi-
pro equipment (normally -10dBu).
Ventilation.
The unit generates a small amount of heat internally, mainly due to the valve heaters.
This heat should be allowed to dissipate by convection through the grill in the front
panel, which must not be obstructed. Do not locate the Pre-Amplifier where it will be
subject to external heating, for example, in the hot air flow from a power amplifier or
on a radiator.
Mounting.
The unit may be free standing or mounted in a 19” rack, where it will require 2U of
space.