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Inputs INPUT CHANNEL A&B
With an input sensitivity of 775 mV = 0 dBu and an input impedance of 20
k ohms, the electronically balanced inputs – INPUT CHANNEL A&B – are
meant for the connection of control amplifiers, 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.
Instructions On How To Install NRS 90208 Extension Kits
• unplug the power amplifier from the mains
• detach all screws holding the cover plate of the appliance
• lift and remove the cover plate
• disconnect the flat-wire cable of the printed board assembly 81340/1
• detach all screws holding the printed board assembly 81340/1
• remove the printed board assembly 81340/1 and unsolder the resistors R106 … R109
• attach insulators to the input transformers according to the corespondent marks on the printed board
assembly
• re-assemble the appliance by performing all steps described in the opposite order
PIN 1: SHIELD
PIN 2: a, +
PIN 3: b, -
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