Inputs INPUT CHANNEL A&B
With an input sensitivity of 775 mV = 0 dBu and an input impedance of
20 kohms, the electronically balanced inputs – INPUT CHANNEL A&B –
are meant for the connection of audio controllers, mixing consoles, etc.
Peripheral pieces of audio equipment are either connected via the XLR-
type input connectors or using the parallel-linked binding posts. For the
latter option you can utilize the supplied screw-plugs. Thus, carrying the
audio signals through to feed additional power amplifiers can be conveni-
ently achieved without the need for special split-cables.
The XLR-type input connectors’ pin-assignment is in accordance to the
IEC 268 standard:
In case the controlling device does not supply balanced output connectors,
it is also possible to configure the connectors for unbalanced operation.
Therefore, the common ground (pin 1) has to be connected to the (–) input
(pin 3). The audio signal is now solely fed through the (+) input (pin 2).
So, to be able to entirely make use of all the advantages the electronically
balanced input stage offers – like the suppression of humming and
interference noise – it is beneficial to re-establish balanced input connec-
tion whenever possible.
In case floating inputs are needed, the inputs are ready to be retrofitted
with input transformers; one optional available extension kit NRS 90208
(308840) per channel is necessary.
PIN 1: SHIELD
PIN 2: a, +
PIN 3: b, -
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