Klein + Hummel
Operating Manual KPA Series
English
11
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 on 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 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.
Be sure to use balanced inputs on all measurement equipment (also oscilloscope probes) if you are bench testing.
O U T 2
I N 2
I N 1
O U T 1
CH1
OUT
stereo mode
bridge mode
+
_
2+
2-
1-
1+
CH2
OUT
+
_
2+
2-
1-
1+
CH1
OUT
+
_
2+
2-
1-
1+
CH2
OUT
2+
2-
1-
1+
figure 8
Connecting Remote Control
Remote Control and remote power standby of the KPA series amplifiers will be available soon through the
K8 system interface. A firmware upgrade to existing amplifiers will make this additional feature possible.
