Tandem Mono; Bridged Mono - Martin Audio MA1.3 User Manual

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CONTENTS
6.2
For tandem (dual channel-single input) operation, depress the Link switch.
Both channels can now be driven by a signal at either input connector. The
output connection is the same as in stereo mode. You can use either TRS
connectors for linking out etc. Do not use the remaining XLR and TRS
connectors for mixing or other purposes. Both level attenuators are
active, allowing you to set different levels for each channel.
Never connect either output terminal to ground or in parallel.
6.3
To bridge the amplifier, depress the Link switch (7) and Phase reverse
switch (6). Both channels are then driven by a single signal at either input.
You can use any remaining input connectors for linking etc. Do not use the
remaining XLR and TRS as input jacks simultaneously for mixing or other
purposes.
To obtain an output, connect the speaker leads to pin +1 on channel A
Speakon to speaker positive terminal and pin +1 on channel B
Speakon to speaker negative terminal. Do not connect either of the -1
(negative) pins of the Speakons. Do not connect speakers to channel
A or B in the normal manner in bridge mode, as this can cause
serious damage.
The recommended minimum nominal impedance for bridged mono is 4
ohms (equivalent to driving both channels at 2 ohms).
Driving bridged loads of less than 4 ohms may cause a thermal overload.
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3
2
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Figure 10. Bridge mono connection
Both level attenuators must be at the same position. We recommend that
you put them in the 0dB (full) position.
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Tandem mono

Bridged mono

I/P
LINK
PHASE
INVERT
Martin Audio – MA1.3 Power Amplifier
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+
+
–
CH A
–
–
+
+
+
– CH B
–
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12
GUIDES
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