Lab.gruppen fP 2400Q - Manual (Page 14)

Figure 4. XLR input connector Figure 5. XLR balanced
Within the Neutrik® Combojack there is a ¼”(6.3mm) phone jack, which is wired in parallel with the
XLR.
TIP HOT
RING COLD
SLEEVE SHIELD/GROUND
Figure 6. ¼” TRS plug
The input impedance is high enough (20 kohms
balanced) to allow ”daisy-chaining”, or multiple
parallel input connections. The headroom of the input
circuits is also high enough to accept the maximum
output level from virtually any low-level signal source.
Balanced signals are less sensitive to AC hum and
radio interference. The source impedance should be
less than 1 kohms to avoid high frequency loss in long
cables.
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To connect an unbalanced input source, connect pins 1 and 3 in the cable’s XLR plug (ring and sleeve in a
TRS plug). If you leave a pin disconnected, you will lose 6dB.
A better method for using unbalanced sources is shown in Figure 8. This is similar to the connection for
balanced lines, but pin 3 is connected to the shield at the source. The hum and noise rejection for the cable
is equivalent to that for a balanced line. To minimize hum in the audio, use balanced inputs whenever
possible.
Figure 7. Unbalanced line connection
Figure 8. Balanced line with unbalanced equipment
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Speaker connections are made via the two Neutrik® NL4FC Speakon connectors. The Speakon
connector is designed for high power speaker connections. It assures the correct polarity, it locks in place
and prevents from shock hazard.
They are wired in the following manner:
The right jack, Channel A and B, has both channel A and B outputs, so it’s useful for bridging and bi-
amp operation (see bridged mono operation on page
8 ). The left Speakon, Channel C and D, carries
both channel C and D outputs.
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