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INPUT A / INPUT B
components within that signal path. Accordingly, input and output connectors of the corresponding
channel are interconnected in parallel, offering permanent electrical connection, without regard to the
setting of the Power-ON switch.
Although having XLR-type output connectors, some mixing console models provide unbalanced
output connection only. When using mixers with unbalanced outputs, bridging PIN1 and PIN3
of the power amp's input connectors or leaving PIN3 of the cable's plugs unconnected is
necessary. Otherwise, when feeding in unbalanced audio signals via PIN3 (b, -, „cold") and PIN2
(a, +, „hot"), strange humming and HF-interference may occur, which very likely will damage the
power amplifier and/or the connected speaker cabinets.
NF-CONNECTION CORDS
Choosing high-quality balanced cables (two conductors for the audio signal plus separate shielding
mesh) with XLR-type connectors is recommended for LF-signal connection. Although connecting un-
balanced cables to the power amplifier inputs is possible as well, using balanced cables is always pref-
erable. A great number of today's audio appliances employ balanced outputs. With balanced cabling,
the shield connects all metal enclosure parts and therefore efficiently eliminates the introduction of
external interference – mostly noise and hum.
XLR-
type connector pin-assignment
XLR (male)
PARALLEL
The input connectors of channel A and channel B are electrically connected
in parallel when the selector switch is set to PARALLEL. However, individually
controlling the volume of both channels is still possible via the corresponding level
controls A and B.
DUAL
If the selector switch is set to DUAL, the audio signals of channels A and B are
independently amplified.
The inputs INPUT A & INPUT B are electronically balanced
offering input sensitivity of +4dBu (1.23V) for direct
connection of mixing consoles, signal processors, etc.
The XLR-type connectors OUTPUT A & OUTPUT B are pre-
pared for „through-connecting" input signals to additional ex-
ternal power amps. The input signal is directly routed to these
output connectors. There are no repeaters or other electronic
XLR (female)
7
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