CHAPTER 4
Connections
13
4.1.2 Unbalanced Inputs
To connect an unbalanced source, tie pin 3 (ring on TRS jack) down to the shield of the
connector. If you leave one pin disconnected, you will lose 6 dB.
A better method for using unbalanced sources is shown in Fig.4.5. 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 minimise hum
in the audio, use balanced inputs whenever possible.
Fig.4.5 Unbalanced line connection (left); balanced line with unbalanced equipment (right)
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” on page 5 for
more details.
4.2 Connecting Speakers
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, locks in place and prevents shock hazard.
They are wired in the following manner:
• the right jack, Channel A, has both channel A and B outputs, so it’s useful for bridging and
bi-amp operation (see the bridge mono sections in Chapter 2)
• channel B carries only the channel B output
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BE169212.book Page 13 Tuesday, January 23, 2007 9:00 AM
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