16
4 Channel Amplifier - Applications
SX-480 / SX-4120
3-Channel-Mode with Stereo/Front-Speakers and Mono/Subwoofer
Interconnect cable checklist:
• Connect the head unit line outputs with good quality RCA to RCA cables to the INPUT
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
Channel 3&4) of the amplifier.
•The minimum final speaker impedance must not be below 2 Ohms Stereo and 4 Ohms
Mono. 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.
Caution
Be careful not to connect speaker (-) to the ground or vehicle chassis.
X-OVER SELECT (Front Speakers CH1/2)
•
If larger than 20 cm speakers are used, the FULL position is recommended.
•
For all smaller speakers (Ø8.7cm - Ø16cm) the Highpass-Position (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 HIGH PASS - ADJUST control.
X-OVER SELECT (Subwoofer CH3/4)
•
In Mono/Subwoofer-Mode select the Lowpass-Position (LP), which eliminates the higher frequencies. The
recommended crossover frequency ranges between 60 - 100Hz, depending on the size and response of the Subwoofer.
The LOW PASS adjustment can be done with the LOW PASS - control. The HIGH PASS-Control is also activated as
Subsonic Filter. The Cut-off frequency should be between 10Hz and 30Hz depending on the size of the installed
Subwoofers.
INPUT LEVEL (CH1/2 & CH3/4)
• Turn the INPUT LEVEL controls on the amplifier to 4V position.
• Turn the head unit volume control to about 80-90% of its full setting.
• Turn the INPUT LEVEL controls clockwise until you hear some distortion.
• Then turn back the INPUT LEVEL controls slightly until you can hear clean sound.
BASS BOOST (CH1/2 & CH3/4)
• Turn the BASS BOOST control from the Front Speakers (CH1/2) into “0dB” - position.
• The BASS BOOST-control from the Subwoofer (CH3/4) increases the bass level up to +12dB.
Caution!
Please use the Bass-Boost carefully. The additional boost may result in clipping or overload.
BASS REMOTE
• With the BASS REMOTE you can also adjust the bass level from driver´s seat.
INPUT MODE SELECT
• The TWIN SUB - switch from CH1/CH2 must be in “OFF” - position and the INPUT MODE SELECT - switch from
CH3/4 must be in “4CH” - position. When you only use one RCA to RCA cable the INPUT MODE SELECT switch
should be set on 2CH - position. The RCA to RCA cable for the Line Input Signal must be connected with the
INPUT of CH1&2.
