
SS75.4 / SS125.4 / 4 CHANNEL AMPLIFIER APPLICATIONS
4 CHANNEL FULL RANGE SYSTEM
Here we show how to use the 4 channel amplifiers as straight forward discrete 4 channel full range units.
Interconnect cable checklist:
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Switch setting checklist: - 1/2CH
Crossover frequency control checklist:
Channels 1/2:
- HI PASS: N/A
- LOW PASS: N/A
Level control checklist:
-Refer to the section “Setting up systems after installation for best performance”
Minimum final loudspeaker impedances: -
FULL RANGE
SPEAKERS
Channels 3/4:
-HI PASS: N/A
-LOW PASS: N/A
FULL RANGE
STEREO LINE
INPUTS
| CH3/4 | L |
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| LINE |
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| CH1/2 |
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| INPUT |
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| CH1 2 | + - gnd + | HI INP | + | CH3 CH4 |
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| 5V 0.2V | LEVEL | 5V 0.2V |
| LEVEL |
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CHANNEL 1 / 2 | 0dB 12dB 60Hz 1.2KHz | BASS EQ HPF | 0dB 12dB 60Hz 1.2KHz |
| BASS EQ HPF | CHANNEL 3 / 4 |
| 30Hz 250Hz | LPF | 30Hz 250Hz |
| LPF |
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| FULL LPF HPF | FULL LPF HPF |
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| LINE |
| CHANNEL | 2 3 4 | MODE |
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| OUTPUT |
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| OUTPUT | LEFT |
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| 3/4 SPEAKER | IGHT | B IDGE |
| CH | - |
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FUSE |
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| TO BATTERY + 12 Volts VIA FUSE |
POWERINPUT | REMGND+12V |
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| REMOTE | ||
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| CHASSIS GROUND |
| OUTPUT | LEFT |
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| CH ½ SPEAKER | +RIGHT | B IDGE |
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| POWER PROTECT |
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2 or 3 CHANNEL FULL RANGE SYSTEM
Here we show how to use the 4 channel amplifiers as full range 2 or 3 channel units by taking advantage of the mono bridging capability of all Autotek amplifiers.
The following example shows how to create a 3 channel system by mono bridging channel pair 3 / 4. In order to create a 2 channel system, simply follow the example to also mono bridge channel pair 1 / 2.
Interconnect cable checklist:
-Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit with good quality RCA cables.
-A MONO signal source is required to bridge channel pair 3/4, such as would be available from the mono sub bass output of an active crossover, whether standalone, or built into a head unit or equalizer.
Important: Do not be tempted to connect the hot, or positive outputs, from any source together to obtain a mono signal, as this could very well damage the output stage of that source.
-It is necessary to feed the SAME signal to both left and right inputs via a Y- adapter RCA cable.
-Connect the mono speaker positive terminal to the LEFT +, and its negative terminal to RIGHT - as shown.
Switch setting checklist:
-1/2CH
-3/4CH
Crossover frequency control checklist:
Channels 1/2:
-HI PASS: N/A
-LOW PASS: N/A
Channels 3/4:
-HI PASS: N/A
-LOW PASS: N/A
TIP: If you are using the mono sub bass output of an active crossover, there is nothing wrong with switching in the low pass filter in these amplifiers for a steeper low pass rolloff.
Level control checklist:
-Refer to the section “Setting up systems after installation for best performance”
Minimum final loudspeaker impedances:
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MONO |
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OR SUB BASS | STEREO |
SPEAKER |
FULL RANGE
1STEREO
1MONO FULL RANGE LINE INPUTS
| CH3/4 | L |
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| LINE |
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| CH1/2 |
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| INPUT |
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| C CH2 | + gnd - + | I INPUT | + gnd - + | CH3 CH4 |
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| 5V 0.2V | LEVEL | 5V 0.2V |
| LEVEL |
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CHANNEL 1 / 2 | 0dB 12dB 60Hz 1.2KHz | BASS EQ HPF | 0dB 12dB 60Hz 1.2KHz |
| BASS EQ HPF | CHANNEL 3 / 4 |
| 30Hz 250Hz | LPF | 30Hz 250Hz |
| LPF |
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| FULL LPF HPF | FULL LPF HPF |
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| LINE |
| CHANNEL | 2 3 4 | MODE |
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| OUTPUT |
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| OUTPUT | +LEFT |
| CH 3/4 SPEAKER | |
FUSE |
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POWER INPUT | GND REM +12V |
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| OUTPUT | |
| CH ½ SPEAKER | |
| POWER | PROTECT |
BRIDGED
B IDGED
TO BATTERY + 12 Volts VIA FUSE REMOTE
CHASSIS GROUND
OR HIGHS
SPEAKERS
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