TL Audio A4 - Manual (Page 10)

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unbalanced connections, for example using unbalanced sends and balanced returns,
with no loss in level.
Balanced XLR 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.
Level Selection.
There are 4 switches located at the left side of the front panel which configure the
operating level of the Summer’s inputs and outputs, providing greater flexibility of
interconnection to other equipment. The switches select a nominal operating level of
either +4dBu or -10dBu, for inputs 1-8, inputs 9-16, the insertion point and the
outputs. +4dBu is traditionally the standard level for connecting “professional”
equipment whereas -10dBu is usually associated with “semi-pro” equipment.
It is essential that the level switches are correctly set to obtain the optimum
headroom and signal to noise ratio for the Summer, and the overall studio setup.
If unsure of the switch settings, when an input signal appears to clip easily it suggests
that the relevant switch needs changing to +4dBu, but if the signal seems low level the
switch should be changed to -10dBu. Similarly, if the insert or output seems too low
the relevant switch should be changed to +4dBu, but if the following equipment is
being easily overdriven the switch should be set to -10dBu.
Ventilation.
The unit generates a moderate amount of heat internally, which should be allowed to
dissipate by convection through the grills in the front and side panels, which must not
be obstructed. Do not locate the unit where it will be subject to external heating, for
example, in the hot air flow from a power amplifier or on a radiator, or in direct
sunlight. Ensure that air is able to circulate freely around and under the unit.
The Summer has been designed for operation free standing or mounted into a standard
19” rack, occupying 2U of space.