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ENGLISH
FUNCTIONAL INSTRUCTIONS
9
The LEVEL INPUT controller determines the input sensitivity (adaptation to the output signal of the head unit). The controller
range is between 5 volts (MIN) and 0.2 volts (MAX).
OPERATING ELEMENTS
7
8
Connect the INPUT RCA jacks with the head unit by using appropriate audio signal cables.
The OUTPUT RCA jacks provide a linear full-range audio signal for driving additional ampliers.
13
12
The X-OVER switch selects the desired operating mode:
FULL: Full-Range mode (the entire frequency range is amplied).
HP: High-Pass mode (frequency is limited downwards, adjustable by the HIGH PASS controller).
LP/BP: Low-Pass/Bandpass mode (frequency is limited upwards, adjustable by the LOW PASS controller). The HIGH PASS
controller then acts as a subsonic lter in this mode and limits the frequency downwards (bandpass function).
NOTE: If this is set higher than the LOW PASS, no sound is heard.
The LOW PASS controller determines the frequency cut-off upwards. The crossover frequency is continuously variable from 50
Hz to 5000 Hz (5 kHz).
10
If your head unit does not have a turn-on signal (REM), you can use the automatic turn-on function of the amplier. This works
in two ways, which can be set at the AUTO TURN-ON switch:
DC: This method only works if you use the amplier’s HIGH LEVEL INPUT. The amplier then detects a voltage rise to 6 volts
when the head unit is turned on by a so-called “DC offset” and then turns on the amplier.
VOX: Select this method when using the INPUT RCA jacks. The amplier then detects a voltage increase in the incoming audio
signal when switching on the head unit via the attached RCA cable and then switches on the amplier.
Note: As soon as the head unit is switched off again, the amplier switches itself off.
The terminal for the amplier turn-on (page 15#2, REM IN/OUT) can now be used to supply additional ampliers with a turn-on
signal. Simply connect the REM terminals of the two ampliers and make sure that the other amplier is in “normal” turn-on
mode, which means that the AUTO TURN ON function is disabled.
6
If the POWER/PROTECT is green, the amplier is ready for operation. If the POWER/PROTECT is red, there is a malfunction.
Refer in this case to the section TROUBLE SHOOTING.
11
The HIGH PASS controller determines the frequency cut-off downwards. The crossover frequency is continuously variable from
10 Hz to 500 Hz.
INPUT OUTPUT
L
R
L
R
LEVEL INPUT
HIGH
PASS
LOW
PASS
BASS
BOOST
HIGH LEVEL INPUT
REMOTE
AUTO
TURN-ON
MIN
DC OFFVOX
MAX 10 Hz 500 Hz 50 Hz
5000 Hz
0dB
12dB
POWER INPUT
GND REM
IN/OUT
+12V
POWER
PROTECT
BAND
PASS
X-OVER
FULL LP/BPHP
L + + R
SPEAKER OUTPUT
BRIDGED
QL500.2
8 9 11 12 13 14
157 6 10 16
16


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