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2 Channel Amplifier - Speaker & RCA-Connection
GTR250.2 – GTR550.2
17
Cable connection
• Connect INPUT of the amplifier to the head unit line output with good quality RCA cables.
If your head unit doesn't have RCA Outputs you can connect the Speaker Outputs of the head
unit with the INPUT HIGH LEVEL of the amplifier.
• Connect the speakers with the terminal block (SPEAKER + BRIDGED -) of the
amplifier.
• The minimum final speaker impedance must not be below 4 Ohm per channel pair. Too low
speaker loads result in too high heat dissipation and may cause the amplifier run into
protection.
• Please observe speaker channel and polarity as printed by the speaker terminal block.
Incorrect phasing of the speakers results in total loss of bass response.
X-OVER - SWITCH & CONTROL
• In 1 Channel/Mono-Mode select at X-OVER "LP" (LOW PASS), which eliminates the higher frequencies.
The recommended crossover frequency ranges between 60 - 150Hz, depending on the size and response of
the Subwoofer. The Lowpass adjustment can be done with the LOW PASS control.
• In this configuration example the HIGH PASS control is not used.
LEVEL INPUT CONTROL
• Turn the LEVEL INPUT control on the amplifier to "4V" position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the LEVEL INPUT control clockwise until you hear some distortion.
• Then turn back the LEVEL INPUT control slightly until you can hear clean sound.
BASS BOOST
• The BASS BOOST - Control increases the bass level at 45 Hz from 0 up to12dB.
Caution!
Please use the Bass-Boost carefully.
ï
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1-Channel-Mode: 1 Subwoofer / Mono
Caution
Please avoid to connect speaker (-) to the ground or vehicle chassis.
Connect RCA cable
from head-unit with
RCA input (INPUT).
FUS E
BRIDGED
SPEAKER OUTPUT
GND REM 12V
POWER INPUT
L R
e13
021257
Subwoofer
4 - 8 Ohm
Green: Left Speaker -
White: Left Speaker +
Black: Ground
Brown: Right Speaker +
Gray: Right Speaker -
HIGH LEVEL INPUT
17


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