5.7
Connecting speakers
Speaker connections are made via the two Neutrik NL4FC Speakon
connectors (1). These connectors meet the EC safety requirements. They
are wired as follows:
Pin -1
Speaker ground.
Pin +1
Speaker positive.
Pin -2
No connection.
Pin +2
No connection.
Figure 9. Speakon connector
Please note that this is the standard wiring convention for Speakon
connectors adopted worldwide.
Never connect either output terminal to ground or to some other
output or input terminal (see warning on page 2). For normal two-
channel operation, connect each speaker load across the outputs positive
and ground terminals. Pay attention to speaker polarity; loudspeakers
connected out of polarity can degrade sound quality.
Keep the speaker cables as short as possible and use a good quality
stranded speaker cable. Do not use shielded wire, such as microphone or
guitar cable. Remember that the speaker cable robs the power of the
amplifiers in two ways: It increases the load impedance and introduces
resistive power losses.
6
OPERATION MODES
6.1
Stereo operation
For stereo (dual channel) operation, leave the Link and Phase reverse
switches in the un-depressed position. In this mode, both channels operate
independently of each other, with their level attenuators controlling their
respective levels. Never connect either output terminal to ground or in
parallel. The recommended minimum nominal impedance for stereo or
tandem operation, is 2 ohms per channel.
Martin Audio – MA1.3 Power Amplifier
E
NGLISH
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