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SM4-800 / SM4-1000 / 4 CHANNEL AMPLIFIER APPLICATIONS
4 CHANNEL FULL RANGE SYSTEM
2 or 3 CHANNEL FULL RANGE SYSTEM
Channels 3/4:
Here we show how to use the 4 channel amplifiers as straight forward discrete 4
- HI PASS: N/A
channel full range units.
- LOW PASS: N/A
Interconnect cable checklist:
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Level control checklist:
- Refer to the section “Setting up systems after installation for best performance”
Switch setting checklist:
Minimum final loudspeaker impedances:
- 1/2CH X-OVER: FULL
- 2-Ohms per channel.
- 3/4CH X-OVER: FULL
Crossover frequency control checklist:
Channels 1/2:
- HI PASS: N/A
- LOW PASS: N/A
Crossover frequency control checklist:
Here we show how to use the 4 channel amplifiers as full range 2 or 3 channel units
Channels 1/2:
by taking advantage of the mono bridging capability of all Autotek amplifiers.
- HI PASS: N/A
The following example shows how to create a 3 channel system by mono bridging
- LOW PASS: N/A
channel pair 3 / 4. In order to create a 2 channel system, simply follow the example
to also mono bridge channel pair 1 / 2.
Channels 3/4:
- HI PASS: N/A
Interconnect cable checklist:
- LOW PASS: N/A
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit
with good quality RCA cables.
TIP: If you are using the mono sub bass output of an active crossover, there is
- A MONO signal source is required to bridge channel pair 3/4, such as would be
nothing wrong with switching in the low pass filter in these amplifiers for a steeper
available from the mono sub bass output of an active crossover, whether
low pass rolloff.
standalone, or built into a head unit or equalizer.
Important: Do not be tempted to connect the hot, or positive outputs, from any
Level control checklist:
source together to obtain a mono signal, as this could very well damage the output
- Refer to the section “Setting up systems after installation for best performance”
stage of that source.
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter
Minimum final loudspeaker impedances:
RCA cable.
- 2-Ohms per channel in stereo mode.
- Connect the mono speaker positive terminal to the LEFT +, and its negative
- 4-Ohms mono bridged.
terminal to RIGHT - as shown.
Switch setting checklist:
- 1/2CH X-OVER: FULL
- 3/4CH X-OVER: FULL
5
LINE INPUT
LINE OUTPUT
R
L
CH3/4 CH1/2
CH3 CH4
CH1 CH2
CHANNEL 1 / 2
CHANNEL 3 / 4
+ - gnd- +
+ - gnd- +
HI INPUT
5V 0.2V 0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF LPF
FULL LPF HPF
X-OVER
5V 0.2V 0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF LPF
FULL LPF HPF
X-OVER
CHANNEL
2 3 4
MODE
R
L
R
L
1 STEREO
1 MONO
FULL RANGE
LINE INPUTS
GND REM +12V
POWER INPUT FUSE
POWER
PROTECT
CH 3/4 SPEAKER OUTPUT
BRIDGED
RIGHT LEFT
- + - -+
CH ½ SPEAKER OUTPUT
BRIDGED
RIGHT LEFT
- + - - +
STEREO
FULL RANGE
OR HIGHS
SPEAKERS
MONO
OR SUB BASS
SPEAKER
REMOTE TURN-ON
CHASSIS GROUND
TO BATTERY + 12 Volts VIA FUSE
GND REM +12V
POWER INPUT FUSE
POWER
PROTECT
CH 3/4 SPEAKER OUTPUT
BRIDGED
RIGHT LEFT
- + - -+
CH ½ SPEAKER OUTPUT
BRIDGED
RIGHT LEFT
- + - +
LINE INPUT
LINE OUTPUT
R
L
CH3/4 CH1/2
CH3 CH4
CH1 CH2
CHANNEL 1 / 2
CHANNEL 3 / 4
+ - gnd - +
+ - gnd - +
HI INPUT
5V 0.2V 0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF LPF
FULL LPF HPF
X-OVER
5V 0.2V 0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF LPF
FULL LPF HPF
X-OVER
CHANNEL
2 3 4
MODE
R
L
FULL RANGE
STEREO LINE
INPUTS
FULL RANGE
SPEAKERS
REMOTE TURN-ON
CHASSIS GROUND
TO BATTERY + 12 Volts VIA FUSE