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FUNCTIONAL INSTRUCTIONS
INTERCONNECTION EXAMPLE
2-channel-mode: 2 x Mono Subwoofers bridged
INTERCONNECTION
Connect the RCA lineouts of the head unit with the RCA jacks LINE IN CH 1 and CH 2 of the amplier with appropriate
high-value RCA cables. If a separate SUB OUT from your head unit is available, use this as line output.
Connect the subwoofers with the SPEAKER OUTPUTS CH1/2 + BRIDGED - and CH3/4 + BRIDGED -.
Always ensure that the total impedance load per channelpair is not lower than 4 ohms.
Too low impedance cause high temperature and will shut down the amplier operation.
Always ensure the correct polarity of the speakers. The interchange of plus and minus cause total loss of bass playback and could
damage the speakers.
INPUT MODE SWITCH
Select the 2CH position on the INPUT MODE switch.
TWIN SUB, CROSSOVER SETTINGS & BASS BOOST CONTROLLER
The X-OVER switch of CH1/2 must be in position LP/BP and the TWIN SUB switch in position ON.
Note: All controllers (BASS BOOST, HP/BP, LP, LEVEL) and the X-OVER switch of CH 3/4 are without function in TWIN SUB mode.
All settings will be synchronized with CH1/2.
In mono/subwoofer operation the X-OVER switch must be in LP/BP position (Lowpass/Bandpass), then the higher frequencies
will be eliminated. The cut-off frequency ist adjustable with the LOW PASS controller of CH1/2 and should be set between
60 to 100 Hz, depending on the size of the subwoofer.
In lowpass mode (LP/BP) the HP/BP controller of CH1/2 works also as subsonic lter, that eliminates the ultra-low, not hearable and
harmful frequencies to generate a bandpass signal (Bandpass mode). The subsonic frequency should be set between
15 to 40 Hz, depending on the size of the subwoofer. NOTE: If this value is higher than the lowpass setting, no sound is hearable.
LEVEL CONTROLLER CH1/2 (SUBWOOFER 1+2)
Turn the LEVEL controller of the amplier to the MIN position.
Turn the volume controller of the head unit to 80 - 90% of its full setting.
Turn the LEVEL controller clockwise until you hear some distortion.
Then turn back the LEVEL controller slightly until you hear a cleaner sound.
BASS REMOTE (SUBWOOFER 1+2)
The enclosed BASS REMOTE CONTROLLER adjusts the bass-level e.g. from the driver’s seat.
Please use only the enclosed bass remote controller and cable.
Use the bass boost with care.
A high bass boost level may cause damages to your speakers and hearing abilities.
NOTE
Connect stereo RCA output (L/R or SUB OUT)
of the head unit with LINE IN (CH1 / CH2) of the amplier
LP/BP
ON
2CH
POWER INPUT
FUSE
SPEAKER OUTPUT
BRIDGED
PROTECT
POWER
FULLHP
LP
CH3/4
HP/BP LEVEL
BASS LEVEL
CONTROLLER
AUTO TURN ON
(ONLY IN HI LEVEL INPUT MODE)
0dB 18dB
LINE OUT
CH2CH1
LEVEL
INPUT
X-OVER
MODE
10Hz 1.2kHz
30Hz 250Hz
CH3
CH4
MIN MAX
OFF
ON
LOW
HI
BASS BOOST
L
R
GND +12VREM
FULLHPLP/BP
LP
HP/BP LEVEL
0dB 18dB
X-OVER
MODE
10Hz 1.2kHz
30Hz 250Hz
MIN MAX
BASS BOOST
LINE IN
CH1
CH2
2CH4CH
CH1/2
INPUT MODE
BRIDGED
CH4CH3
ZRX9404
LP/BP
SUB
TWIN
OFF
ON
BLUE / WHITE
LOG0
POWER INPUT
FUSE
SPEAKER OUTPUT
BRIDGED
PROTECT
POWER
FULLHP
LP
CH3/4
HP/BP LEVEL
BASS LEVEL
CONTROLLER
AUTO TURN ON
(ONLY IN HI LEVEL INPUT MODE)
0dB 18dB
LINE OUT
CH2CH1
LEVEL
INPUT
X-OVER
MODE
10Hz 1.2kHz
30Hz 250Hz
CH3
CH4
MIN MAX
OFF
ON
LOW
HI
BASS BOOST
L
R
GND +12VREM
FULLHPLP/BP
LP
HP/BP LEVEL
0dB 18dB
X-OVER
MODE
10Hz 1.2kHz
30Hz 250Hz
MIN MAX
BASS BOOST
LINE IN
CH1
CH2
2CH4CH
CH1/2
INPUT MODE
BRIDGED
CH4CH3
ZRX9404
LP/BP
SUB
TWIN
OFF
ON
BLUE / WHITE
LOG0
Subwoofer 1
4 – 8 Ohms
Subwoofer 2
4 – 8 Ohms
Connect Bass
Level Controller
with the enc-
losed cable
23


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