Applications; Power Amplifier - JBL PX300.4 Service Manual

Power Amplifier

The JBL Px300.4 amplifier can be set
up for stereo or tri-mode operation, as
shown in Figures 6 and 7.
NOTE: For simplicity, Figures 6 and 7 do
not show power, remote and input
connections.
APPLICATIONS – Px300.4
Figure 6. The JBL Px300.4
amplifier is set to stereo mode
to drive front and rear pairs of
full-range speakers.
NOTE: To limit bass sent to
full-range speakers, set
X-OVER MODE to HP. See
page 6 to set FREQ and SLOPE.
Set REAR and FRONT
INPUT MODE to ST
(on input panel)
ST MO
INPUT
MODE
Figure 7. The JBL Px300.4
amplifier is set to drive a stereo
component system and a
subwoofer with a nominal
impedance of 4 ohms or greater.
NOTE: To drive a pair of rear
midbass speakers (instead of
subwoofer), set INPUT MODE
to ST, X-OVER MODE to LP,
and use DBO to set HP filter.
Set FRONT
INPUT MODE to ST
(on input panel)
Set FRONT
X-OVER MODE to HP
(on input panel)
FLAT HP LP
MODE
GND REM BATT
NEON
Px300.4
POWER
Px300.4
RF Speaker
(rear panel)
+
Set REAR and FRONT
-
X-OVER MODE to FLAT
(on input panel)
LF Speaker
+
FLAT HP LP
MODE
-
GND REM BATT
NEON
Px300.4
POWER
Px300.4 RF
System
(rear panel)
+
Set REAR
-
INPUT MODE to MO
(on input panel)
LF
System
ST MO
+
INPUT
MODE
-
Set REAR
X-OVER MODE to LP
(on input panel)
FLAT HP LP
MODE
4
PX300.4
FRONT REAR
BRIDGED
R L STEREO R L
FUSES SPEAKER OUTPUTS SPEAKER OUTPUTS
LR Speaker
RR Speaker
FRONT
REAR
BRIDGED
R L STEREO R L
FUSES SPEAKER OUTPUTS SPEAKER OUTPUTS
NEON
+
-
+
-
NEON
Subwoofer
+
-