Lab.gruppen iP 900 - Manual (Page 12)

Figure 4. XLR input connector Figure 5. XLR balanced
ithin the Neutrik® Combojack there is a ¼”(6.3mm) phone jack, which is wired in parallel with the
IP HOT
ROUND
W
XLR.
T
RING COLD
SLEEVE SHIELD/G
igure 6. ¼” TRS plug
The input impedance is high enough (20 kohms balanced) to
t
o daisy chain amplifiers, use the screw-terminal (Phoenix
ch
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n t source, connect pins 1 and 3 in the cable’s XLR plug (ring and sleeve in a
8. This is similar to the connection for
e
Figure 8. Balanced line with unbalanced equipment
F
allow ”daisy-chaining”, or multiple parallel input connections.
The headroom of the input circuits is also high enough to accep
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.
T
connector), labeled Link, provided on each channel. It is
connected in parallel with the Neutrik® Combo jack on ea
input.
To con ect an unbalanced inpu
TRS plug). If you leave a pin disconnected, you will lose 6dB.
A better method for using unbalanced sources is shown in figure
balanced lines, but pin 3 is connected to the shield at the source end of the cable. The hum and noise
rejection for the cable is equivalent to that of a balanced line. To minimize hum in the audio signal, us
balanced inputs whenever possible.
Figure 7. Unbalanced line connection
For two-channel (stereo) operation, use both channels A and B. For tandem stereo or bridged mono
operation, use only one of the inputs. See
operation modes for more details.
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