20
Cable Connections:
• Connect the head unit subwoofer line output with good quality RCA to RCA cables and
Y-Connectors (Split signal) to the AMPLIFIER INPUT CH1/2 & CH3/4 of the amplifier.
• Connect the Subwoofers with the terminal blocks (SPEAKER BRIDGED - from CH 1/2 and
+ BRIDGED - from CH3/4) of the amplifier.
• The minimum final speaker impedance must not be below 2 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.
•
•
2-Channel-Mode: 2 Subwoofer / Mono bridged
FILTER - Switch & Control (CH1/2 & 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 (CH1/2 & CH3/4)
• The BASS-EQ control increases the bass level from "0 - 18dB".
Caution!
Please use the Bass-Boost carefully.
BASS REMOTE - Control
• The BASS REMOTE should not be used in this configuration.
+ +
SUBWOOFER
4 OHM min.
+ +
SUBWOOFER
4 OHM min.
4-Channel Amplifiers - Speaker & RCA-Connection
QE 900.4
Caution
Please avoid to connect speaker (-) to the ground or vehicle chassis.
SUBWOOFER
OUTPUT
2 x Y-CONNECTOR
