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CONTROLS, INDICATORS, AND TERMINALS
INPUT PANEL
Figure 1: Input Panel Terminals and Controls
1. FRONT CHANNEL FILTER MODE SELECT SWITCH (MODE)
"HPF": Slide switch to this position if the amplifier is used as a mid/tweeter amplifier.
"OFF": Slide switch to this position if the amplifier is used as a full-range amplifier.
"LPF": Slide switch to this position if the amplifier is used as a subwoofer amplifier.
2. FRONT CHANNEL HIGH-PASS/LOW-PASS FREQUENCY SELECTOR KNOB (FREQ)
Select a high/low-pass crossover frequency between 30Hz to 300Hz.
3. FRONT CHANNEL BASS BOOST CONTROL (BOOST)
Select a boost level between 0dB and +18dB to enhance the bass performance of your sound
system.
4. FRONT CHANNEL INPUT SENSITIVITY LEVEL CONTROL (SENS)
The input sensitivity level can be varied from 5.0 volts to 100 mV depending on the output volt-
age of the source unit (refer to sub-section titled INPUT SENSITIVITY ADJUSTMENT).
5. FRONT CHANNEL HIGH IMPEDANCE INPUT
To be connected to RCA pre-amp outputs from a source unit (i.e., radio, tape deck or CD player).
6. FRONT/REAR CHANNEL LOW IMPEDANCE INPUT
To be connected to speaker outputs from a source unit when pre-amp outputs are not available.
7. LINE LEVEL OUTPUT
This output can be used to connect to another amplifier for system expansion.
Note: This line level output is full range.
8. REAR CHANNEL FILTER MODE SELECT SWITCH (MODE)
"HPF": Slide switch to this position if the amplifier is used as a mid/tweeter amplifier.
"OFF": Slide switch to this position if the amplifier is used as a full-range amplifier.
"LPF": Slide switch to this position if the amplifier is used as a subwoofer amplifier.
9. REAR CHANNEL HIGH-PASS/LOW-PASS FREQUENCY SELECTOR KNOB (FREQ)
Select high/low-pass crossover frequency between 30 Hz to 300Hz.
10. REAR CHANNEL BASS BOOST CONTROL (BOOST)
Select a boost level between 0dB and +18dB to enhance bass performance of your sound
system.
11. REAR CHANNEL INPUT SENSITIVITY LEVEL CONTROL (SENS)
The input sensitivity level can be varied from 5.0 volts to 100 mV depending on the output
voltage of the source unit (refer to sub-section titled INPUT SENSITIVITY ADJUSTMENT).
12. REAR CHANNEL HIGH IMPEDANCE INPUT
To be connected to RCA pre-amp outputs from a source unit (i.e., radio, tape deck or CD
player). If there is only one input available, connect it to the front input so that signals can
automatically be directed to the rear channels.
13. REMOTE SUBWOOFER GAIN INPUT (not available on 321QE)
To be connected to the optional R S remote subwoofer volume control.
OUTPUT PANEL
Figure 2: Output Panel Terminals and Indicators
14. POWER AND PROTECT INDICATOR (PWR/PRT)
Green light indicates that the amplifier is "ON." Red light indicates either a high current,
short circuit or DC offset is detected at the speaker outputs. The amplifier will revert to normal
operation once the problem is rectified. The red indicator also lights up at a high operating
temperature. Under this condition, the amplifier will automatically shut down. As soon as the
temperature falls to a safe level, the amplifier will automatically resume operation.
15. POWER INPUT TERMINAL (B+)
To be connected to the positive terminal of the vehicle’s battery or other constant +12 V
source.
16. GROUND INPUT TERMINAL (GND)
To be wired to the vehicle’s chassis for ground.
17. REMOTE TURN-ON INPUT TERMINAL (REM)
To be connected to the remote control wire or power antenna lead of the source unit for
remote ON/OFF.
18. FUSE RECEPTACLE
19. FRONT CHANNEL LEFT/RIGHT SPEAKER OUTPUT TERMINAL
For connection to the front speaker system.
20. REAR CHANNEL LEFT/RIGHT SPEAKER OUTPUT TERMINAL
For connection to the rear speaker system.
COUSTIC.COM
5
FRONT
REAR
SPKR LEVEL
L
R
REMOTE
SENS
MIN MAX
MODE
HPF OFF LPF
FREQ
30 300
60 180
0 +18
BOOST
SENS
MIN MAX
MODE
HPF OFF LPF
FREQ
30 300
60 180
0 +18
BOOST
OUTPUT FRONT REAR
INPUT
7
512
1
2 8
9
6
4
3
11
10 13
FUSE
PWR /PRT
GND REM B+
1417 1516 18
19
+ L - + R -
BRIDGE
BRIDGE
+ L - + R -
FRONT
REAR
20