Bedienungsanleitung Crunch GTR 250.2 (Seite 21 von 24) (Deutsch, Englisch)

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4 Channel Amplifier - Speaker & RCA-Connection

GTR250.4 – GTR350.4

CH3/4

CH1/2

LINE INPUT

LINE OUTPUT

LEVEL

60Hz

30Hz

250Hz

0dB

12dB

BASS BOOST

INPUT MO DE

2CH

4CH

X-OVER

0,2V

1.2kHz

BASS BOOST

LEVEL

0,2V

X-OVER

FULL

CH3/ CH4

CH1/CH2

3CH

HPFULL

CH3 CH4

CH1 CH2

HIGH

INPUT

+++

---

-----

+++++

-----

Speakers 2 - 8 Ohms

Subwoofer 4 - 8 Ohms

Connect RCA outputs from

head-unit with RCA inputs

(LINE INPUT CH1/2 & CH3/4).

Caution

Please avoid to connect speaker (-) to the ground or vehicle chassis.

3-Channel-Mode: 2 Speakers/Stereo & 1 Subwoofer / Mono

Cable connection

• Connect the 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 HIGH INPUT of the amplifier.

• Connect the speakers with the terminal block (CH3 +/- & CH4 +/ - SPEAKER and

the subwoofer with CH1/2 + BRIDGED - SPEAKER of the amplifier.

• The minimum final speaker impedance must not be below 2 and 4 Ohm (subwoofer) 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.•

XOVER SWITCH & CONTROL (CH3/4)

• If larger than 20 cm speakers are used, the "FULL" position is recommended.

For all smaller speakers (8.7cm - Ø16cm) the Highpass-Position (HIGH PASS) is recommended, which eliminates the lowest

frequencies and protects the speakers from damage. Set the crossover-frequency between 60Hz - 150Hz, depending of the size

of the installed speakers. The Highpass adjustment can be done with the "HP" (HIGH PASS) control.In this configuration example

the "LP" LOW PASS control is not used.

X-OVER - SWITCH & CONTROL (CH1/2)

• Select at X-OVER "LP"-Position (LOW PASS), which eliminates the higher frequencies. The recommended crossover

frequency ranges between 60 - 100Hz, depending on the size and response of the Subwoofer. The Lowpass adjustment can be

done with the "LP" (LOW PASS) control. In this configuration example the "HP" (HIGH PASS) control is not used.

LEVEL CONTROL (CH1/2 & CH3/4)

• Turn the LEVEL control on the amplifier to "5V" position.

• Turn the head unit volume control to about 80-90% of its full setting.

• Turn the LEVEL control clockwise until you hear some distortion.

• Then turn back the LEVEL control slightly until you can hear clean sound.

BASS BOOST (only CH3/4)

• The BASS BOOST - Control increases the bass level at 45 Hz from 0dB up to 12dB. Caution! Please use the Bass-Boost carefully.

INPUT MODE

• The INPUT MODE switch must be in “4CH” - position (Stereo-Signal on Subwoofer) or

"3CH" - position (Mono-Signal on Subwoofer).

Attend the configuration of the

HIGH LEVEL INPUTS

CH1/2 & CH3/4 on page 20.

REV. 2

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Crunch GTR 250.2 Seite 21

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