R
EVOLUTION OF POWER
STREET MACHINE
AMPLIFIERS
SM1600.2 / SM1400.4
SM3200.1 / SM4800.1 / SM6000.1
GENERAL INSTALLATION PROCEDURE
System Design
The success of any car stereo system relies on several factors, such as the system design, execution of the installation, and system setup. Please
remember that any system is only as good as its weakest link.
Please remember that higher power systems are not necessarily useful purely for high sound pressure levels, but also to establish a headroom capability, to
reproduce musical peaks cleanly without distortion. Lower power amplifiers will clip earlier than their more powerful cousins, and cause loudspeaker failure when
overdriven, due to the harmonics generated by a clipped signal, thus overheating voice coils.
Amplifiers should be mounted with the fins running horizontally for best convection cooling, to minimize overheating. Purchase the best quality RCA cables you can
afford, for reliability and less engine noise interference in the audio system.
Installation
-20
WOOD
It is highly recommended that the amplifier be mounted to a board of MDF or other solid
structure using the 4 mounting screws provided. Avoid mounting the
amplifier to metal as this can introduce noise and other unwanted issues. When mounting
the amplifier, ensure that it is mounted HORIZONTALLY, as shown in the diagram above, for
optimal heat dissipation. Mounting amplifiers to speaker enclosures is not recommended as
this can cause damage to the amplifier components. When choosing a location for
mounting the amplifier, ensure that you check for clearance from wires, gas tank, electrical
devices and brake lines etc.
-10
-6
-10 dB +3dB
-0 10 25 50 65 80 100%
POWER LEVEL
FRONT
-20
-10
-6
-10 dB +3dB
-0 10 25 50 65 80 100%
POWER LEVEL
REAR
General:
Run the wiring so that RCA cables are at least 18“ away from power and speaker cables. Keep RCA cables away from electrical devices in the vehicle that can cause
electrical noise, such as electric fuel pumps, emission control modules and other on-board electronic modules.
Power and ground connections(see the features matrix on page 7 for proper gauge cables per amplifier):
Use a sufficient gauge power cable and ground cable using the chart below as reference to what size wire you require. Street Machine series amplifiers require at
least 4 gauge power wire. In a multi amplifier system, add the total value of the manufacture recommended fusing to get your total system amperage. Some
applications may require multiple runs of power wire to meet the system requirements. In multi amplifier systems it is advisable to mount a large enough fuse right at
the battery, and run one or multiple +12 volt power cables to a fused distribution block near the amplifiers. It is then a simple matter to connect the +12 volt terminal of
each amplifier to the distribution block. During this process, please ensure that the main power fuse is removed to avoid shorting the electrical system. The main fuse
must be within 12” of the vehicles battery.
Ground each amplifier with as short a ground lead as possible directly to the vehicle chassis using at least 4 gauge wire or equivalent to the size of the amplifiers’
power wire. Use a ground distribution block, if you wish, but it is extremely important to keep the main ground lead from this distribution block to the chassis as short
as possible , not more than 12“. The ground connection integrity to the chassis is very important, and the best way to achieve a good, solid electrical and mechanical
contact is to use a large round crimp lug, crimped and soldered to the ground cable. The next step is to scrape the paint off the vehicle chassis , slightly larger than
the ground lug, at the connection point. Drill a clearance hole in the chassis, the same size as the lug hole, and use a bolt, spring washer and nut to securely fasten
the ground lug. Use petroleum jelly to coat the bolt/lug connection, to prevent oxidization with time.
TIP: Use the same approach when installing head units, equalizers or any audio equipment for that matter - run short individual grounds from each piece directly to
the vehicle chassis, to minimize ground loops and system noise. All power, ground and speaker connections should be crimped and soldered for reliability. Make sure
that none of the cable insulation can chafe against exposed metal in the vehicle, causing short circuits to the chassis.
WIRE LENGTH
SYSTEM
AMPERAGE
7-10 ft.
13-16 ft.
16-19 ft.
19-22 ft.
22-28 ft.
4
35-50
8
6
4
4
4
50-65
6
4
4
4
4
2
68-85
4
4
2
2
2
0
85-105
4
2
2
2
2
0
105-125
4
2
0
0
0
0
125-150
2
0
0
0
0
0
WIRE GAUGE
10-13 ft.
Safe connection sequence:
After all cables are run, connect speaker wires to the speakers and amplifiers, then run and plug in RCA cables. Next, connect all power, ground, and remote turn on
leads. Now connect all +12 volt cables to the amplifier/s and distribution blocks and fuse holders. Finally, connect the main +12 volt cable to the battery, with the main
fuse removed, and we are almost ready to power up the system.
Power up the system:
The following procedure may seem like overkill, but there is nothing more frustrating when turning on a system for the first time, and it does not work properly
immediately.
First, make sure the head unit is off, and turn all level controls to minimum (counterclockwise), including the head unit volume control. Set all equalizers to 0 dB (no
boost), and all crossover frequency controls at approximate frequencies, as recommended by the loudspeaker manufacturer. Set all input selector and crossover
switches as required for the application. Remove all amplifier fuses, and insert the main fuse at the battery. If the fuse does not blow, you can insert the fuse in one of
the amplifiers, and we are ready to turn on the system. Turn the head unit on, insert a CD, or select a radio station, and increase the head unit volume control. If the
system sounds fine, turn off the head unit, and install fuses in the remaining amplifiers, one by one, till the complete system is powered up and functioning properly.
AMPLIFIER FEATURE DESCRIPTIONS
STREET MACHINE AMPLIFIERS:
Each model is capable of 4 & 2-Ohms stereo per channel, or 4-Ohms mono bridged operation except the mono amps
which are capable of 4, 2 and 1-Ohm loads.
The input sensitivities for rated output powers are variable from 0.2V to 5V on the multi channel amplifiers and 0.2V to
6V on the mono models.
All crossovers are fully variable in their respective ranges.
Crossover filters are 12dB/Octave.
A POWER LED indicates the powered up and turned on condition.
All Autotek amplifiers feature a comprehensive diagnostic system, with speaker lead short circuit, and amplifier DC
faults indicated by the red “PROTECT” LED.
CAUTION: DO NOT OPERATE ANY AMPLIFIER BELOW THE INTENDED IMPEDANCE. YOU WILL CAUSE
DAMAGE TO THE AMPLIFIER THAT WILL NOT BE COVERED UNDER THE WARRANTY PRINTED IN THE BACK
OF THE MANUAL. 2 & 4 Channel amps are capable of 4 and 2-Ohms wired stereo and 4-Ohms wired mono
bridged. The mono amps are capable of 4, 2 and 1-Ohm.
SM1600.2 2-CHANNEL AMPLIFIERS
L
L
LEVEL BASS EQ HPF
LPF
X-OVER
MODE
+ - gnd - +
HI INPUT
5V 0.2V
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
FULL LPF HPF MONO
STEREO
R
R
LINE OUT LINE INPUT
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
-BASS EQ: Adjustable 45Hz bass boost from 0dB to 12dB.
MODE: The mode switch allows you to choose Stereo for full range 2 channel operation or MONO for bridging operation
HIGH INPUT: If your radio/CD player does not have unbalanced (RCA) outputs, you can use the HIGH level (wire) inputs.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 5V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy chain multiple amplifiers from one signal.
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic filter.
-When the LPF mode is selected, a 0 to +12dB, at 45Hz, BASS -EQ is also switched in.
SM1400.4 4-CHANNEL AMPLIFIERS
CHANNEL 3 / 4
CH3/4 CH1/2
R
Ch3 Ch4
R
+ - gnd - +
HI INPUT
L
L
LINE INPUT
+ - gnd - +
LEVEL BASS EQ HPF
5V
0.2V
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF
LPF
Ch1 Ch2
5V
0.2V
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
X-OVER
MODE
FULL LPF HPF
2 3 4
X-OVER
LINE OUTPUT
FULL LPF HPF
CHANNEL 1 / 2
The 4 channel amps have the same features as the 2 channel models accept that there are 2 sets of controls. 1 set for channels 1 & 2 and 1 set for channels 3 & 4.
In addition, the 4 channel models have a Mode switch which allows you to select 2, 3 or 4 channel operation. Switch to 2 channel if you only have 1 set of RCA’s in CH 1/2 and
the unit will automatically supply signal to channels 3/4. Select 3 channel when you only have RCA’s in CH 1/2 but plan to run channels 3/4 bridged. Select 4 channel if you
are providing RCA’s to channels 1/2 and 3/4.
The X-OVER slide switch selects the internal crossover functions:
-The input signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting simplifying daisy chaining of amplifiers.
-HPF: Selects the built in HIGH PASS filter, variable from 60 Hz to 1.2kHz.
-FULL: Bypasses all crossovers for full frequency range operation.
-LPF: Selects the built in LOW PASS , variable from 30 Hz to 250Hz.
-BASS EQ: Adjustable 45Hz bass boost from 0dB to 12dB.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 5V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy chain multiple amplifiers from one signal.
Note that the LOW PASS signal is MONO.
-In the LPF position, the HIGH PASS filter acts as a subsonic filter.
-When the LPF mode is selected, a 0 to +12dB, at 45Hz, BASS -EQ is also switched in.
SM3200.1 / SM4800.1 / SM6000.1 MONO BLOCK AMPLIFIERS
POWER
PROTECT
REMOTE
CONTROL
BASS
SUB
BOOST SONIC
LOW
PASS
LEVEL
0dB 12dB 15Hz 55Hz 40Hz 150Hz 6V 0.2V
OUTPUT INPUT
L
L
R
R
-The LINE INPUT signal is routed directly to the LINE OUT RCA jacks, regardless of the X-OVER setting simplifying daisy chaining of amplifiers.
-SUBSONIC: Allows you to adjust the crossover filter from 15Hz to 55Hz.
-LOWPASS: Allows yo to adjust the LOW PASS crossover filter from 40Hz to 150Hz.
LEVEL: Adjusts the input sensitivity from 0.2 volts to 6 volts.
BASSBOOST: 45Hz bass boost adjustable from 0db to 12dB.
REMOTE CONTROL: This is the input jack for the remote Level control.
LINE INPUT: The line input accepts unbalanced (RCA) inputs from 0.2V to 6V.
LINE OUTPUT: The line output passes through signal from the line inputs which allows you to daisy chain multiple amplifiers from one signal.
The mono amps are capable of 4, 2 & 1-Ohm loads.
Operating the amp below 1-Ohm can cause damage to the amp not covered in the warranty.
SM1600.2 2 CHANNEL AMPLIFIER APPLICATIONS
FULL RANGE STEREO
This is the most basic application for the SM Series 2 channel amplifiers.
4. MODE:
Should be in the STEREO position.
5. Line Level:
Refer to the section “Setting up systems after installation for best performance”
1. Interconnect cable checklist:
Connect the LINE INPUTS to the Radio/CD with good quality RCA cables.
2. Crossover Switch:
The X-OVER switch must be in the FULL position.
3. Crossover frequency control checklist:
N/A for full range operation.
FULL RANGE
SPEAKERS
L
-20
-10
-6
-10 dB +3dB
-20
+ - gnd - +
HI INPUT
-0 10 25 50 65 80 100%
-10 dB +3dB
-6
-10
-0 10 25 50 65 80 100%
POWER LEVEL
FRONT
POWER LEVEL
REAR
SPEAKER OUTPUT
BRIDGED
+ LEFT + RIGHT -
L
R
R
LINE OUT LINE INPUT
STEREO
FUSE
MODE
POWER INPUT
X-OVER
FULL LPF HPF MONO
REM BATT+12V
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
POWER
PROTECT
LEVEL BASS EQ HPF
5V 0.2V
TO BATTERY +12v
VIA FUSE
REMOTE TURN-ON
CHASSIS GROUND
GND
FULL RANGE
STEREO LINE INPUT
NOTE: Minimum final loudspeaker impedances:
4 & 2 Ohms stereo mode or 4-Ohms mono mode
This amplifier will not do 1 Ohm stereo or 2/1 Ohm mono operation.
MONO
This application illustrates the basic mono bridging method for all Autotek
amplifiers.
Switch setting checklist:
- The AMPLIFIER X-OVER switch should be in the LPF position and the MODE
should be in the MONO position.
Interconnect cable checklist:
A MONO signal source is required, such as would be available from the mono
sub bass output of an active crossover, whether stand alone, 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 RIGHT -, and its
negative terminal to LEFT +.
Minimum final loudspeaker impedance:
- 4 ohm mono.
MONO SPEAKER
L
-20
-10
-6
-10 dB +3dB
POWER LEVEL
FRONT
-20
-10
-6
-10 dB +3dB
-0 10 25 50 65 80 100%
POWER LEVEL
REAR
X-OVER
STEREO
MODE
FULL LPF HPF MONO
POWER
PROTECT
FUSE
REM BATT+12V
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
POWER INPUT
5V 0.2V
LEVEL BASS EQ HPF
GND
HI INPUT
+ - gnd - +
-0 10 25 50 65 80 100%
SPEAKER OUTPUT
BRIDGED
+ LEFT + RIGHT -
L
R
R
LINE OUT LINE INPUT
FULL RANGE
MONO LINE INPUT
VIA Y-ADAPTER
FROM MONO SOURCE
Crossover frequency control setting checklist:
LPF: 11 o’clock
TO BATTERY +12v
VIA FUSE
REMOTE TURN-ON
CHASSIS GROUND
The HIGH LEVEL inputs are used when the radio/CD player does not have RCA cable outputs. You can connect the radio/CD player speaker wires directly to the
amplifier via the high Level Inputs.
Use this connector for 2 CH amplifiers
GRAY: CH 1 Speaker Input +
BROWN: CH 1 Speaker input Black: Chassis Ground
GREEN: CH 2 Speaker Input White: CH 2 Speaker Input +
Use both connectors for 4 CH amplifiers
ORANGE: CH 3 Speaker Input +
PINK: CH 3 Speaker input Black: Chassis Ground
BLUE: CH 4 Speaker Input YELLOW: CH 4 Speaker Input +
SM1400.4 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. The MODE switch should be in 4CH.
- HI PASS: N/A
- LOW PASS: N/A
Interconnect cable checklist:
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.
Channels 3/4:
- HI PASS: N/A
- LOW PASS: N/A
Minimum final loudspeaker impedances:
- 2 ohm per channel.
-20
-10
-6
-10 dB +3dB
R
L
-0 10 25 50 65 80 100%
Ch3 Ch4
0.2V
CHANNEL 3 / 4
LPF
X-OVER
FULL LPF HPF
X-OVER
FULL LPF HPF
MODE
2 3 4
LINE OUTPUT
GND REM +12V
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
CHANNEL 1 / 2
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF
5V
0.2V
LEVEL BASS EQ HPF
5V
CH 1/2 SPEAKER OUTPUT
+ - gnd - +
HI INPUT
Ch1 Ch2
+ - gnd - +
POWER LEVEL
REAR
- RIGHT+
-10 dB +3dB
POWER LEVEL
FRONT
BRIDGED
-6
-10
-0 10 25 50 65 80 100%
- LEFT -+
CH3/4 CH1/2
LINE INPUT
-20
- RIGHT+
R
L
FULL RANGE
STEREO LINE
INPUTS
- LEFT +
Crossover frequency control checklist:
Channels 1/2:
BRIDGED
Level control checklist:
- Refer to the section “Setting up systems after installation for best performance”
CH 3/4 SPEAKER OUTPUT
Switch setting checklist:
- 1/2CH X-OVER: FULL
- 3/4CH X-OVER: FULL
2 or 3 CHANNEL SYSTEM
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking
advantage of the mono bridging capability of all Crunch amplifiers.
Switch setting checklist:
- 1/2CH X-OVER: FULL
- 3/4CH X-OVER: LPF
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.
Crossover frequency control checklist:
Channels 1/2:
- HI PASS: N/A
- LOW PASS: N/A
Interconnect cable checklist:
- MODE: Set at 3CH
- 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. If you only have 1 set of RCA
outputs from your headunit, you can simply connect those to the inputs for ch
1/2 and switch the MODE to 2ch. The amplifier will auto sum the signal and
provide mono output for bridged channels 3/4.
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 Yadapter RCA cable.
- Connect the mono speaker positive terminal to the LEFT +, and its negative
terminal to RIGHT - as shown.
Level control checklist:
- Refer to the section “Setting up systems after installation for best performance”
-10 dB +3dB
R
L
BRIDGED
-6
Ch3 Ch4
+ - gnd - +
HI INPUT
Ch1 Ch2
+ - gnd - +
POWER LEVEL
REAR
0.2V
CHANNEL 3 / 4
LPF
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
CHANNEL 1 / 2
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF
5V
0.2V
LEVEL BASS EQ HPF
5V
BRIDGED
-10
-0 10 25 50 65 80 100%
- LEFT +
-20
- RIGHT+
-10 dB +3dB
CH 3/4 SPEAKER OUTPUT
-6
POWER LEVEL
FRONT
- LEFT -+
-10
-0 10 25 50 65 80 100%
- RIGHT+
CH3/4 CH1/2
LINE INPUT
-20
CH 1/2 SPEAKER OUTPUT
Minimum final loudspeaker impedances:
- 2 ohm per channel in stereo mode.
- 4 ohm mono bridged.
X-OVER
X-OVER
FULL LPF HPF
FULL LPF HPF
MODE
2 3 4
LINE OUTPUT
GND REM +12V
L
FULL RANGE
STEREO LINE
INPUTS
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.
R
MONO LINE INPUT
(Unless using procedure
listed above for 3ch)
Channels 3/4:
- HI PASS: N/A
- LPF: 11 o’clock
MONO SPEAKER
SM1400.4 4-CHANNEL AMPLIFIER APPLICATIONS
Front/Rear high pass, using a 2 channel amplifier for mono sub bass
The combination of a 2 and a 4 channel amplifier, utilizing their built in
crossovers, makes it a snap to put together a full system with front and rear
highs, with mono sub bass.
Channels 1/2:
- HI PASS: 100 Hz
LOW PASS: N/A
Interconnect cable checklist:
- Using good quality RCA cables, feed the front and rear outputs of a head
unit to the inputs of the 4 channel amplifier as shown.
- Also connect the LINE OUT of the 4 channel amplifier to the LINE INPUT of
the 2 channel amplifier as shown.
Channels 3/4:
- HI PASS: 100 Hz
- LOW PASS: N/A
2 channel bass amplifier:
- HI PASS (Subsonic filter): 10 Hz to 40 Hz
- LOW PASS: 80 Hz
Mono bass woofer wiring:
Connect the mono speaker positive terminal to the LEFT +, and its negative
terminal to RIGHT -.
Please note that these frequency points are suggestions only. Refer to the
loudspeaker manufacturer specifications and the section “Setting up systems
after installation for best performance”
Switch setting checklist:
4 channel highs amplifier:
- 1/2CH X-OVER: HPF
- 3/4CH X-OVER: HPF
Level control checklist:
- Refer to the section “Setting up systems after installation for best
performance”
2 channel bass amplifier:
- X-OVER switch: LPF
-10
-6
-10 dB +3dB
R
L
-0 10 25 50 65 80 100%
Ch3 Ch4
+ - gnd - +
0.2V
CHANNEL 3 / 4
LPF
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
CHANNEL 1 / 2
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
LEVEL BASS EQ HPF
5V
0.2V
LEVEL BASS EQ HPF
5V
X-OVER
X-OVER
FULL LPF HPF
FULL LPF HPF
MODE
2 3 4
LINE OUTPUT
GND REM +12V
HI INPUT
Ch1 Ch2
+ - gnd - +
POWER LEVEL
REAR
- LEFT +
-20
BRIDGED
-10 dB +3dB
- RIGHT+
-6
POWER LEVEL
FRONT
BRIDGED
-10
-0 10 25 50 65 80 100%
CH 3/4 SPEAKER OUTPUT
CH3/4 CH1/2
LINE INPUT
-20
- LEFT -+
R
L
FULL RANGE
STEREO LINE
INPUTS
- RIGHT+
Crossover frequency control checklist:
- 4 channel highs amplifier:
CH 1/2 SPEAKER OUTPUT
Minimum final loudspeaker impedances:
- 2 ohm per channel in stereo mode.
- 4 ohm mono bridged.
STEREO
INTERCONNECT
RCA CABLE
MONO SPEAKER
L
-10
-6
-10 dB +3dB
POWER LEVEL
FRONT
-20
-10
-6
-10 dB +3dB
-0 10 25 50 65 80 100%
POWER LEVEL
REAR
X-OVER
STEREO
MODE
FULL LPF HPF MONO
POWER
PROTECT
FUSE
REM BATT+12V
LPF
0dB 12dB 60Hz 1.2KHz 30Hz 250Hz
POWER INPUT
5V 0.2V
LEVEL BASS EQ HPF
GND
HI INPUT
+ - gnd - +
-0 10 25 50 65 80 100%
SPEAKER OUTPUT
BRIDGED
+ LEFT + RIGHT -
L
R
R
LINE OUT LINE INPUT
-20
TO BATTERY +12v
VIA FUSE
REMOTE TURN-ON
CHASSIS GROUND
SM3200.1 / SM4800.1 / SM6000.1 MONO AMPLIFIER APPLICATION
Basic application
These sub bass amplifiers can be used in any of the bi-amplification systems described in
this manual, replacing the 2 channel amplifiers as per the illustrations.
Crossover frequency control checklist:
LOW PASS: 40Hz to 150Hz
SUBSONIC:15 Hz to 55 Hz
BASS EQ: 0 to +12dB
Interconnect cable checklist:
Connect the inputs to a suitable source, e.g. a head unit with good quality RCA cables.
Connect the LINE OUT to the inputs of the system highs amplifier.
Level control checklist:
Refer to the section “Setting up systems after installation for best performance”
Use at least #12 gauge speaker wiring. The amps have dual speaker terminals,
simplifying the hookup of multiple speakers. These amps are mono, 1 channel, amplifiers
which have multiple positive and negative connections for ease of wiring. The 2 positives
are the same internally and the 2 negatives are the same internally.
Minimum final loudspeaker impedance: 1-Ohm.
POWER
PROTECT
SPEAKER OUTPUT
+
+
-
MONO
SUBWOOFER
-20
-10
-6
-10 dB +3dB
REMOTE
CONTROL
-0 10 25 50 65 80 100%
POWER LEVEL
FRONT
-20
-10
-6
-10 dB +3dB
-0 10 25 50 65 80 100%
POWER LEVEL
REAR
MI
N MAXX
FUSE
LOW
PASS
FULL RANGE
STEREO LINE INPUT
REM BATT+12V
L
PARALLEL MONO
SUBWOOFERS
2-OHMS EACH MINIMUM
TO BATTERY +12v
VIA FUSE
REMOTE TURN-ON
CHASSIS GROUND
GND
R
OUTPUT INPUT
R
L
POWER INPUT
LEVEL
0dB 12dB 15Hz 55Hz 40Hz 150Hz 6V 0.2V
BASS
SUB
BOOST SONIC
DESIGNATED
MONO OUTPUT
FROM HEAD UNIT
POWER INPUT
FUSE
GND
REM BATT+12V
SPEAKER OUTPUT
+
+
-
Y-ADAPTOR
NOT USED
Note: You can use the Radio/CD designated mono line output or a full range stereo line output.
For full range stereo line output, you will need an optional “Y-Adaptor” as shown.
SETTING UP SYSTEMS AFTER INSTALLATION FOR BEST PERFORMANCE
SM1600.2 / SM1400.4
General:
At this point you are ready to get more specific on the settings for your amplifier.
High Pass:
-When in HPF operation, this setting acts as a low frequency cut off for your system reproduction. The point that you set it at cuts off any frequencies from reproduction beyond this point.
The 12 o’clock position is a great starting point. EXAMPLE: If you adjust the HPF to 100Hz, the amplifier will not play frequencies below 100Hz but will play frequencies from 100Hz to the
highest frequency the amplifier is capable of reproducing.
-When in LPF operation, this setting acts as a low frequency cut off for your system reproduction aka Subsonic Filter. The point that you set it at cuts off any frequencies from
reproduction beyond this point. The 12 o’clock position is a great starting point. EXAMPLE: If you adjust the HPF to 60Hz, the amplifier will not play frequencies below 60Hz but will play
frequencies from 60Hz to the chosen Low Pass frequency.
-When in FULL operation, the LPF crossover is bypassed.
Bass EQ:
This setting is a fixed bass boost at 45Hz that is variable from 0-12dB. This feature provides impact to your bass, but if not adjusted correctly, it can be over used and cause damage to
your speakers and amplifiers. It is best to slowly turn this setting clockwise until the desired punch is felt. It is not recommended to exceed the 12 o’clock position unless listening at a low
volume or a low recording quality as this can result in high distortion and possibly clipping.
Low Pass:
The LPF control acts as a ceiling and doesn’t allow frequencies to the right of the desired setting to be reproduced. Turning the potentiometer all the way to the right is a great starting
point. EXAMPLE: If you adjust the LPF to 120Hz, the amplifier will not play frequencies above 120Hz but will play frequencies from 120Hz to the chosen Hi Pass or Subsonic frequency.
-When in HPF operation, this setting is bypassed.
Level Control Setup:
Ensure that the Level is turned completely to the left prior to turning the system on. Next you should insert a CD or cassette that you are familiar with to use as a reference, and turn the
head unit volume control to about 80% of its full setting. The system sound level will of course be very low, and the following procedures will help you to match the amplifier input
sensitivities properly to the head unit output signal level.
It is important to match the amplifier LEVEL input sensitivity to the Radio/CD output sensitivity. This can be located in the Radio/CD manual.
If the Radio/CD output sensitivity is 2 volts, then adjust the amplifier LEVEL input to 2 volts.
If you are not sure what the Radio output sensitivity is, follow these general guide lines:
Turn the level control up slowly, till you hear distortion, then back off a few degrees on the control. If at any point your amplifier goes into protection, you will need to turn the Level to the
left a bit and then try again. If you reach a point where the output does not increase, stop turning the Level control to the right as the amplifier/speaker combo has reached its maxx
output in this application.
2 or 3 way active systems (all):
Always start with the bass, or low frequency amplifier as a reference, by turning its control up to the point where distortion is audible, and back it off some.
Now adjust the level control for the highs or tweeter channels in a 2 way active system, to balance the highs to lows.
In a 3 way active system, match the midrange level to the bass, and then the highs to the midrange and bass. It may be necessary to perform a few iterations of the midrange and highs level
control settings to achieve a satisfactory sound balance.
SM3200.1 / SM4800.1 / SM6000.1
General:
At this point you are ready to get more specific on the settings for your amplifier.
Subsonic:
This setting acts as a low frequency cut off for your system bass reproduction. The point that you set it at cuts off any frequencies from reproduction beyond this point. The 12 o’clock
position is a great starting point. EXAMPLE: If you adjust the Subsonic to 25Hz, the amplifier will not play frequencies below 25Hz but will play frequencies from 25Hz to the chosen Low
Pass frequency.
Bass Boost:
This setting is a fixed bass boost at 45Hz that is variable from 0-12dB. This feature provides impact to your bass, but if not adjusted correctly, it can be over used and cause damage to
your subwoofers and amplifiers. It is best to slowly turn this setting clockwise until the desired punch is felt. It is not recommended to exceed the 12 o’clock position unless listening at a
low volume or a low recording quality as this can result in high distortion and possibly clipping.
Low Pass:
The LPF control acts as a ceiling and doesn’t allow frequencies to the right of the desired setting to be reproduced. The 12 o’clock position is a great starting point. EXAMPLE: If you
adjust the Low Pass to 80Hz, the amplifier will not play frequencies above 80Hz but will play frequencies from 80Hz to the chosen Subsonic frequency.
Level Control Setup:
Ensure that the Level is turned completely to the left prior to turning the system on. Next you should insert a CD or cassette that you are familiar with to use as a reference, and turn the
head unit volume control to about 80% of its full setting. The system sound level will of course be very low, and the following procedures will help you to match the amplifier input
sensitivities properly to the head unit output signal level.
It is important to match the amplifier LEVEL input sensitivity to the Radio/CD output sensitivity. This can be located in the Radio/CD manual.
If the Radio/CD output sensitivity is 2 volts, then adjust the amplifier LEVEL input to 2 volts.
If you are not sure what the Radio output sensitivity is, follow these general guide lines:
Turn the level control up slowly, till you hear distortion, then back off a few degrees on the control. If at any point your amplifier goes into protection, you will need to turn the Level to the
left a bit and then try again. If you reach a point where the output does not increase, stop turning the Level control to the right as the amplifier/subwoofer combo has reached its maxx
output in this application.
Sit back and enjoy the music!
TROUBLESHOOTING A SYSTEM
The key to finding the problem in a misbehaving sound system is to isolate parts of that system in a logical fashion to track down the fault.
Description of the PROTECT system built into all Autotek amplifiers
The diagnostic system will shut down the amplifier, until reset by turning the head unit off, and back on. This state of affairs will be indicated by the front panel PROTECT
LED lighting up under the following conditions:
1 - A sort circuit on the loudspeaker leads.
2 - An internal amplifier fault that causes a DC offset on the loudspeaker output.
Should the amplifier go into protect mode, simply disconnect all RCA and speaker leads, while keeping +12 volt, power ground and remote leads connected.
1. Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.
2. If not, plug the RCA cables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.
3. If the amplifier seems fine with RCA cables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic
system.
Amplifier heatsink overheating
The amplifiers will shut down when the heatsink temperature reaches 80 degrees centigrade, and turn back on once the unit has cooled down below that point.
Causes of overheating:
1 - Inadequate cooling - relocate or remount to provide better natural airflow over the fins.
2 - Driving high power levels into low impedances - back off on the volume control, and/or make sure you are not loading the amplifier with less than the recommended
loudspeaker impedance.
Low output power
1 - Check that level controls have been set up properly.
2 - Make sure that the battery voltage, as measured at the amplifier’s +12 volt and ground terminals, is 11 volts or more.
3 - Check all +12 volt and ground connections.
Fuses blowing
1 - The use of loudspeaker impedances below the recommended minimums will draw more current - check.
2 - A short on the main +12 volt cable from the battery to the vehicle chassis will cause the main fuse to blow.
3 - If an amplifier fuse blows continually, with only +12 volt, ground and remote leads connected, the amplifier may be faulty.
System does not turn on
1 - Check all fuses.
2 - Check all connections.
3 - Measure the +12 volt and remote turn on voltages at the amplifier terminals. If these are non existent or low, take voltage measurements at fuse holders, distribution
blocks, the head unit’s +12 volt and remote leads to localize the problem.
Noise problems
System noise can be divided into two categories, hiss, and electrical interference.
Hiss, or white noise
1 - High levels of white noise usually occurs when amplifier level controls are turned up too high - readjust according to the procedures in section ”Setting up systems after
installation for best performance”
2 - Another major problem that can cause excessive hiss, is a noisy head unit - unplug the amplifier input RCA cables, and if the hiss level reduces, the source unit is at fault.
Electrical interference
The inside of an automobile is a very hostile electrical environment. The multitude of electrical systems, such as the ignition system, alternator, fuel pumps, air conditioners,
to mention just a few, create radiated electrical fields, as well as noise on the +12 volt supply and ground. Remember to isolate the problem - first unplug amplifier input RCA
cables, if the noise is still present, check the speaker leads, if not, plug the RCA’s back, and investigate the source driving the amplifier, one component at a time.
A ticking or whine that changes with engine RPM:
1 - This problem could be caused by radiation pickup of RCA cables too near to a fuel pump or a distributor, for instance, - relocate cables.
2 - Check that the head unit ground is connected straight to the vehicle chassis, and does not use factory wiring for ground.
3 - Try to supply the head unit with a clean +12 volt supply directly from the battery +, instead of using a supply from the in dash wiring/fusebox.
A constant whine:
This type of noise can be more difficult to pinpoint, but is usually caused by some kind of instability, causing oscillations in the system.
1 - Check all connections, especially for good grounds.
2 - Make sure that no speaker leads are shorting to exposed metal on the vehicle chassis.
3 -RCA cables are notorious for their problematic nature, so check that these are good, in particular the shield connections.
OEM Integration
Accessories
MX-1 Premium High To Low Level Converter
* Converts High Level OEM speaker wires to Ultra Clean RCA
Low Level Outputs
* High Level Inputs: Accepts all types of High level Inputs
including floating ground and high voltages up to 30 volts.
* Audio Signal Sense / Hardwire Turn-On: Audio sense detects
music signals from the OEM wires and activates the MX-1. As
an option, the module also offers a remote turn-on wire.
* Parametric Bass EQ: Features Bass Boost, adjustable Band
Width (wide & narrow), Low Pass and Subsonic Filter.
* Clipping Indicators: Visually indicates audio signals Pre-Clip,
Soft Clip and Hard Clip
* Balanced Line Output: Ultra clean DIN variable high voltage
output for driving mono amps.
* Remote Output: Driver circuit to turn on amplifier when
module activates.
* Bass Remote: Features for subwoofer Level control with builtin clipping indicators.
* Input & Output Level Control: Allows for gain matching both
radio and amplifier audio signals.
MX-3 Bass Controller
* Parametric Bass EQ: Provides a wide array of subwoofer output signal
shaping controls to enhance bass response and sound quality including
Bass Boost, adjustable Bandwidth (wide and narrow), Low Pass and
Subsonic Filter.
* Accepts a wide range of incoming music signal levels while
accommodating all types of head units and signal processors and
controlling the output level to the amp to maximize a signal strength up to
9 volts.
* Clipping Indicators: Visual clipping indicators provide indication of
damaging clipped signals to help protect the subwoofer(s) and amplifier.
Includes pre-clip, soft-clip and full-clip indications.
* Music Shaping: Shapes the music signal to achieve deep bass notes as
low as 15Hz.
* Bass Remote: Included bas Remote features built-in clipping indicators
allows direct bass control from in-dask or under-dash.
MX-2 Deluxe High To Low Level Converter
MX-4 Add A Sub High To Low Level Converter
* Converts High Level OEM speaker wires to Ultra Clean RCA
Low Level Outputs
* High Level Inputs: Accepts all types of High level Inputs
including floating ground and high voltages up to 30 volts.
* Audio Signal Sense / Hardwire Turn-On: Audio sense detects
music signals from the OEM wires and activates the MX-2. As
an option, the module also offers a remote turn-on wire.
* Remote Output: Driver circuit to turn on amplifier when module
activates.
* Converts High Level OEM speaker wires to Ultra Clean RCA Low Level
Outputs
* High Level Inputs: Accepts all types of High level Inputs including
floating ground and high voltages up to 30 volts.
* Audio Signal Sense / Hardwire Turn-On: Audio sense detects music
signals from the OEM wires and activates the MX-4. As an option, the
module also offers a remote turn-on wire.
* Remote Output: Driver circuit to turn on amplifier when module activates.
AUTOTEK AMPLIFIERS
CAR AMPLIFIERS