Connecting Outputs - Martin Audio MA18K - 2010 User Manual

1.6

Connecting Outputs

Warning: there are lethal voltages at the loudspeaker connectors when the amplifier is turned on. To
prevent any damages turn the amplifier off before connecting the loudspeaker.
Output connectors are made via Neutrik Speakon connectors. Consult the wire gauge chart to find a suitable
wire gauge to minimize power and damping factor losses in the speaker cables. The outputs can also work
in bridge mode. For each device the 1+ and 2+ pins of Speakon connector are paralleled internally and have
to be considered as the positive output of the channel; likewise the 1- and 2- pins of Speakon connector are
also paralleled internally and should be treated as the negative output of the channel.
Note: Channel B is run out of phase internally, corrected by reversing the connections from the amplifier
output to the output connecter Channel A is run in phase. By having channel A and B operating in opposite
polarity, the energy storage in the power supply is more efficient. This is significant for signals below 100Hz
(sub bass etc.) and improves the power bandwidth.
Be sure to use balanced inputs on all measurement equipment (including oscilloscope probes) if you
are bench testing.
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All material © 2010 Martin Audio Ltd. Subject to change without notice