Connecting Outputs - Martin Audio MA12K - 2007 User Manual

The figure below shows the connection of analog input for balanced and unbalanced line. You can use both
configurations, but you must consider that unbalanced long line can introduce noise in the audio system. The
Link switch located in the rear panel is for direct paralleling the rear input connectors. You can use the
remaining input connector to carry signal to other amps.
1.6

Connecting Outputs

Warning: there are lethal voltages at the loudspeaker connectors when the amplifier is turned on. To
prevent damage 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 connected inside and have to
be considered the positive output of the channel; the 1- and 2- pins of speakon connector are connected
inside and have to be considered the negative output of the channel.
Note: Channel B is internally polarity reversed. Because the internal polarity is corrected by feeding the
minus pins of the channel B output with the output voltage, the amplifier outputs work in-phase as far as the
user is concerned.
By having channel A and B operating in opposite polarity, internally, 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 (also oscillator probes) in you are
bench testing.
All material © 2007. Martin Audio Ltd. Subject to change without notice.