12
THE INPUTS
The back mounted unbalanced inputs appear
as gold plated cinch connectors. They are
marked numeric (1 ... 4), colored and
according to their channel (Left - white, Right -
red).
Additionally the unit disposes gold plated
connectors on the front panel. They are
marked numeric and according to their
channel. The connectors comprise a switch
function with priority: a front inserted plug will
switch off the correspondig signal present on
the back.
The input impedance is approx. 50 kOhms.
THE AMPLIFIERS
The input signals first pass individual amplifier
stages. To match all possible operational
conditions, gain can be adjusted separately for
each output on the front panel.
Gain adjustment in the range from -3 ... +24 dB
is provided by a multiturn trimpot.
THE BALANCING
Depending on the version selected, balancing
is achieved either electronically or by means of
balancing transformers.
HINT
In case of unbalanced termination of the
elec-
tronically balanced
outputs, pin 3 of the XLR
connector may not be shortened but must be
left open! Signal level is reduced by 6 dB! (See
page 12)
OPTION
As an option the unit may be equipped with
high quality output transformers. These
transformers are controlled by a special
circuitry to achieve low inner resistance, very
good frequency range and low distortions.
They exceed IRT recommendations.
THE OUTPUTS
The balanced outputs are gold plated XLR-
type connectors. They are situated on the rear
of the unit and marked numeric (1 ... 4) and
according to their channel (Left, Right).
The polarity meets AES 14-1992:
1 = Ground, 2 = (+) Phase, 3 = (-) Phase
The output impedance is approx. 30 ohms.
To avoid hum loops, signal ground can be
removed from each output by pulling jumpers
inside the unit.
Refer to:
The Earth / Grounding Concept !
UNBALANCED INPUT – BALANCED OUTPUT
(if this Modul is present)
