User Manual 9250
2-8 Portrayal
Table
2-3, Input coupling Jumpers
Input
CH1
CH2
Aux CH1
Aux CH2
Link J27
J4 J31 J16
Table
2-4
, Output coupling Jumpers
Impedance CH1
CH2
Link J19
J8
Configure Single-ended or Differential Outputs
The default configuration is single-ended. If you order the amplifier
with differential outputs, channel 2 input is disabled and channel 1
output is amplified and routed differentially to both channels 1 and 2.
Channel 1 outputs the normal signal and channel 2 outputs the
inverted phase signal.
The rear panel, as shown in Figure 1-2 has a push-push switch.
Pressing the switch once, will activate the differential mode and will
cause a light on the rear panel to illuminate. Pressing the switch again
will disable the differential mode and allow each amplifier to operate
separately.
The differential source impedance must be adjusted in the factory to
your requirement. For true differential source impedance, the output
source impedance is halved. For example, instead of 600
Ω
, each
channel has 300
Ω
however, since each channel is inverted 180
°
to
the other channel, the source impedance is summed and presents
true 600
Ω
to the load.
WARNING
Output impedance for differential mode is factory set for
differential drive. If you change the rear panel switch set-
ting to Differential OFF position, the source impedance
is half of what should be for normal operation. Changing
from differential mode to normal must without changing
the internal source resistors will double the output am-
plitude and may damage your equipment.