6.3
Bridged mono
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.
Figure 11. Bridge mono connection
Both level attenuators must be at the same position. We recommend that
you put them in the 0dB (full) position.
6.4
Stereo reverse
This mode is similar to the Tandem mono mode. Apart from depressing the
Link switch, you also depress the Phase reverse switch, as in the Bridge
mono. Channel B is now phase reversed. To compensate for that, connect
pin +1 on channel B Speakon to speaker negative terminal and pin -1 on
channel B to speaker positive terminal.
Martin Audio – MA2.8 Power Amplifier
E
NGLISH
14
1
2
3
–
–
+
+
CH A
+
1
2
3
–
–
–
+
+
+
CH B
+
I/P
LINK
PHASE
INVERT
–
–
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