21
4-Channel Amplifiers - Speaker & RCA-Connection
QE 900.4
Caution
Please avoid to connect speaker (-) to the ground or vehicle chassis.
3-Channel-Mode: 2 Speakers / Stereo & 1 Subwoofer / Mono bridged
Cable Connections:
• Connect the head unit line outputs with good quality RCA to RCA cables to the AMPLIFIER INPUT SECTION
CH1/2 & CH3/4 of the amplifier.
• Connect the Front Speakers with the terminal block (SPEAKER OUTPUT + CH1 - and + CH2 -) of the
amplifier.
• Connect the Subwoofer with the terminal block (SPEAKER OUTPUT + BRIDGED - from CH3/4) of the
amplifier.
• The minimum final speaker / subwoofer impedance must not be below 1 Ohms / 2 Ohms Mono.
Too low speaker loads result in too high heat dissipation and may cause amplifier damage.
• Please observe speaker channel and polarity as printed by the speaker terminal block.
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FILTER - Switches & Control (Speakers on CH1/2)
•
If larger than 20 cm speakers are used, the HP FILTER MODE "OFF" position is recommended.
For all smaller speakers (8.7cm - 16cm) the Position FILTER MODE "HP" 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 FILTER FREQ. HP control.
In this operation-mode FREQ. FILTER LP and BASS REMOTE CONTROL is not used. Set LP FILTER MODE to "OFF"
FILTER - Switches & Control (Subwoofer on CH3/4)
• In 1-Channel-Mode in Mono select the LP FILTER MODE to "LP", 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 FREQ. FILTER LP control. In this operation-mode FREQ. FILTER HP is not used.
Set HP FILTER MODE to "OFF"
• If HP FILTER MODE is "ON" the FREQ. FILTER HP control works as a Subsonic-Filter (Bandpass). Together with the FREQ. FILTER LP you
can adjust the treshold frequency.
GAIN - Control (CH1/2 & CH3/4)
• Turn the GAIN controls on the amplifier to "MIN." position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the GAIN controls clockwise until you hear some distortion.
• Then turn back the GAIN controls slightly until you can hear clean sound.
BASS-EQ - Control (only CH3/4)
• The BASS-EQ control increases the bass level (only CH3/4) from "0 - 18dB".
Caution!
Please use the Bass-Boost carefully.
BASS REMOTE - Control (only CH3/4)
• The included REMOTE allows a increasing of Bass Boost (only CH3/4 ). Set on this BASS CONTROL Switch to "EXTERNAL".
+ +
SUBWOOFER
2 OHM min.
4 OHM
4 OHM
BASS REMOTE
MAX.
MIN.
BASS REMOTE
