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Crunch GTO2120 Manual

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11
ENG
POWER SUPPLY AND TURN ON CONNECTION (FIG. 2)
(1) +12 V terminal for the positive-connection of the battery
(2) REM terminal for the turn on connection
(3) GND terminal for the ground
(4) Vehicle’s battery
(5) In-Line Fuse (not included in the scope of delivery)
(6) Turn on wire from the headunit or the electrical antenna
(7) Protection-LED and Power-LED
FIGURES (P. 33-36)
The LED (POWER, fig. 2, 7) lits up, if the amplifier is in operation.
The LED (PROTECTION, fig. 2, 7) lits up, when the amplifier is overheated, or a short circuit occurs
resp. a too low impedance load is connected to the speaker outputs. If this happens, the internal built-
in protection circuit shuts down the amplifier automatically. The amplifier should work again properly
after you have solved the problems.
PROTECTION CIRCUIT
CONNECTIONS AND CONTROLLERS (FIG. 1)
(1) High level signal input for loudspeaker outputs from the headunit.
(2) RCA audio signal inputs from the headunit
(3) Gain level controller
(4) Bass boost controller
(5) Selector LPF (Lowpass) / FULL / HPF (Highpass)
(6) Lowpass/Highpass filter controller
If the amplifier is used to drive a subwoofer, set the switch (X-OVER, Fig. 1, 5) to "LPF". Set the desired
cross-over frequency by using the controller (LPF/HPF, Fig. 1, 6). Thus to that only the frequencies
below the chosen cross-over frequency will be amplified and the subwoofer plays more precised and
efficient. A good point to start is at 125 Hz.
VARIABLE LOWPASS FILTER
If the amplifier is to be used for satellite loudspeakers (mid-range/tweeter loudspeakers), set the switch
(X-OVER, Fig. 1, 5) to "HPF" or for bigger loudspeakers (>20 cm) to ”FULL”. Set the desired cross-
over frequency on controller (LPF/HPF, Fig.1, 6). Thus to that only the frequencies above the chosen
cross-over frequency will be amplified. This effectively minimizes distortions and overloads at lower
frequencies. A good point to start is at 125 Hz.
VARIABLE HIGHPASS FILTER
By using the controller (BASS BOOST, Fig.1, 4) you are able to increase the bass level. The range is
between 0 and 12dB.
Note: Use the bass boost wisely. A too high bass boost could permanently damage the speakers.
VARIABLE BASS BOOST
… 11 …


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