User guide

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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 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, use
balanced inputs whenever possible.
Figure 7. Unbalanced line connection Figure 8. Balanced line with unbalanced equipment
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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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, has both channel A and B outputs, so it’s useful for bridging and bi-amp
operation (see bridged mono operation on page 7
). Channel B, carries only the channel B output.
Channel A and B into two separate
Speakons.
Channel A and B into one Speakon
(Stereo and Bi-amp)
Bridged mono
Never connect either output terminal to ground or to some other output or input terminal
For normal two-channel operation, connect each speaker load across the output’s positive and negative
terminals. Pay attention to speaker polarity; loudspeakers connected out of polarity degrade sound
quality and may be damaged as a consequence.
Keep the speaker cable leads as short as possible, and use a good quality stranded speaker cable. Do not
use shielded leads, such as microphone or guitar cable. Remember that the speaker cable robs the power
of the amplifiers in two ways: by increasing the load impedance, and by introducing resistive power
losses.
WARNING: To prevent from electric shock, do not operate the amplifier with any of the
conductor portion of the speaker wire exposed.
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