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• Always wear protective eyewear when
using tools.
• When routing cables, keep input signal
cables away from power cables and
speaker wires.
• When making connections, make sure
that each connection is clean, insulated
and properly secured. Observe the
polarity markings on the rear panel.
Refer to the application drawings to set
up the amplifier for operation in stereo,
bridged-mono, bi-amp or tri-mode con-
figurations.
• If the amplifier’s fuse must be replaced,
use only the same rating and type as a
replacement. Do not substitute another
kind.
Controls and Connectors
1. Pre-amp Level Input Connector –
Connects to line-level output from the
source unit.
2. Universal Interface Speaker-Level
Connector – Connects to speaker-level
output from the source unit. Provides
Common Sense amplifier turn-on
when used with factory radios
(2-channel on P-4020, 4-channel on
P-4040).
3. Pre-amp Level Output Connector –
Connects to other amps or processors
in the signal chain (flat on P-4020, flat
or filtered on P-4040).
4. Speaker-Output Connector – (2-chan-
nel on P-4020, 4-channel on P-4040).
5. Fuses – P-4020: 20A ATC type, P-4040:
30A ATC type.
6. Power Connector – Connection for
12V+, Gnd and Rem.
7. Input-Mode Switch – Sums left and
right inputs.
8. Input-Sensitivity Control – Adjusts
input sensitivity for pre-amp level and
speaker-level inputs.
9. Pre-amp Output Selector Switch –
Selects input path for pre-amp output.
Output can be summed from front and
rear inputs with no filter, or filtered by
the front or rear crossover.
10. Rear-Channel Input Selector – Selects
rear-channel input between front input
and rear input.
11. Crossover Selector – Determines
whether the crossover is a High-Pass
filter (HP), a Low-Pass filter (LP) or
unfiltered (Flat).
LEVEL
INPUT MODE
MO ST
4V .250V
XOVER
FLATHPLP
2V
20
– R +– L ++BATT
REM GND
BRIDGE
SPEAKER OUTPUTS
POWER
FUSE
20A
MADE IN THE U.S.A.
R
L
LINE LEVEL
INPUT
SPEAKER LEVEL IN
R
+
–
L
+
–
AUX
OUT
R
L
+R–
+R–
–L+
–L+
AUX
OUT
R
L
R
L
FRONT
FRONT
REAR
LINE LEVEL
INPUT
SPKR LEVEL IN
REAR
ST MO
INPUT MODE
PRE OUT
LEVEL
INPUT MODE
MO ST
4V .250V
FRONT
F+R
FLAT
REAR
LP
FRT
LP
FRT REAR
XOVER
FLATHP LP
XOVER
FLATHPLP
LEVEL
4V .250V
2V2V
REAR
INPUT
FUSE
30A
BRIDGE
– R +– L +
MADE IN THE U.S.A.
+BATT REM GND
BRIDGE
SPEAKER OUTPUTS
POWER
FRONT
REAR
30
8
7
11
5
4
6
1 2
3
1
2 3
9
10
8
7
11
8
11
4
5
6
P-4020
P-4040
7
P-4020/4040 OM. 7/14/98 11:42 AM Page 3