PRELIMINAR
Y
11
E
figure 1.8.1
1.8 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 loudspeker
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. For each device the 1+ pin of speakon connector have
to be considered the positive output of the channel; the 1- pin of speakon connector have to be considered the negative
output of the channel.
Note: Channel B is always polarity reversed output stage, but polarity compensated by feeding the minus pins of the
channel B output with the output voltage. Channel A is connected in the polarity mode. 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.The outputs can also work on bridge mode, see the figure 1.8.2
for the connections in this mode.
Be sure to use balanced inputs on all measurement equipment (also oscilloscope
probes) in your testing bench.
The figure below shows the connection of the speakons to the speakers. Pay attention to the position of the link switch; in
stereo mode turn the position to "off", in bridge mode turn to "on" and turn the gain control of each couple of channels at
the same level. In bridge mode the dots lines indicate an alternative connection of the speaker.
figure 1.8.2
stereo mode
LINK SWITCH
2+
2-
1-
1+
CH1
SPEAKON CH1
+
-
2+
2-
1-
1+
CH2
SPEAKON CH2
+
-
2+
2-
1-
1+
CH3
SPEAKON CH3
+
-
2+
2-
1-
1+
CH4
SPEAKON CH4
+
-
bridge mode
2+
2-
1-
1+
2+
2-
1-
1+
CH1
CH2
SPEAKON CH1
SPEAKON CH2
+
-
+
-
2+
2-
1-
1+
2+
2-
1-
1+
CH3
CH4
SPEAKON CH3
SPEAKON CH4
+
-
+
-
