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Dear Customer
Selecting fine audio equipment, such as the unit you have just purchased, is only the beginning of your musical enjoyment. Now is the time to consider how to maximize the fun and excitement your equipment has to offer.
AUTOTEK and the Electronic Industry Associations Consumer Electronic Group want you to get the most out of your equipment by playing it at a safe level, a level that lets the sound come through loud and clear without annoying blaring distortion; most importantly, without affecting your sensitive hearing.
Sound can be deceiving. Over time your hearing “comfort level” adapts to higher volumes of sound; what may have sounded
“normal” can actually be too loud and harmful to your hearing. Guard against this by setting your equipment at a safe level BEFORE your hearing adapts.
To establish a “safe level”:
•
Start your volume control at a low setting.,
•
Slowly increase the sound until you can hear it comfortably and clearly, and without distortion.
•
Once you have established a comfortable “sound level” make a note of this position and do not go above this setting.
Taking a minute to do this will help to prevent hearing damage in the future. After all, we want you listening for a lifetime.
Introduction
Your Autotek STREET MACHINE amplifier has been designed to give you very high performance, and valuable features, at a reasonable price. Take the time to read over this brief set of instructions, and you will get full enjoyment from your system.
Installation
The quality of the installation will affect system performance and reliability. You may wish to contact a dealer or professional installer. The amplifier is generally mounted in the rear trunk area but can be mounted in any convenient areas such as beneath a seat.
Please be sure to locate this unit where you have reasonable air circulation and protection from any hazard with moisture. When considering the mounting location you should minimize the length of the power supply and speaker leads. Minimizing both leads will provide higher audio output from the system. It is important to ensure that the cooling fans or the heat sink are not against a panel or a surface preventing air circulation. Mark the location fro the mounting screw holes by using the amplifier as a template. Drill #29 or
9/64” diameter holes at the marked locations and firmly fasten the amplifier in place with the mounting screws supplied in the accessory kit. (Refer Fig. 1)
Caution
Before drilling or cutting any holes investigate the layout of your automobile thoroughly. Take care when working near the gas lines or hydraulic lines and electrical wiring.
Warning
This power amplifier has a protection feature to prevent any damage from misuse or faulty conditions—excessive heat, short circuited speakers or overload. If the unit senses one of the above conditions, the protection indicator will light and the system will shut down.
To diagnose the problem turn all levels down, all power off and check the installation for possible wiring mistakes or shorts. In the event the amplifier shuts down due to excessive heat under adverse conditions simply allow time for the unit to cool down at which time the protection indicator will not light.
Power Supply Connections
The +12VDC and ground wires should be heavy gauge standard copper wire with heavy insulation. The wire gauge should be
10AWG for the 4070Xi or larger. In addition it has a 12V control wire and it should be 14AWG-18AWG. It is preferable to have longer speaker wires and shorter power supply wires so as to minimize power losses.
+12V Power
This wire is usually connected directly to the positive battery terminal. Ensure that the + power supply wire is fused via an assigned fuse in line with + power supply wire. This connection must be completed by using spade lug with insulating sleeve.
Ground
This connection must be completed by using spade lug with insulating sleeve. This wire is the electrical ground and must be fastened securely to the vehicle chassis. The best method is to use a shelf threading sheet metal screw since the threads cut into bare metal.
Ensure that all paint coating or other insulation is removed from around the hole area and using self-tapping screw, securely affix the bare wire ends to the vehicle chassis. Use as short a piece of cable as possible —use the same gauge as for the +12V.
Remote
Many radios or other music sources have an output terminal for connection of the remote turn -on of the power amplifier. If a radio doesn’t have a remote turn -on feature, then you can use the antenna relay wire which activates the antenna motor. But you must take notice if the antenna is come down when the tape player is operating. In this case, you can’t use the antenna relay wire to operate the remote turn-on.
Caution
First make +12V wire connection then the ground connection and finally the remote connection.
Furthermore the +12V wire must always be fused at the battery for protection against possible damage. If you need to replace the power fuse, replace it with a fuse of the same value. Using a fuse of a different type or rating may result in a serious hazard.
The amplifier has two types of signal input terminal. RCA connector for low level inputs and 5-pin modular connector for high level inputs. Adjustment of input levels I accomplished by the gain control o f both channels. Adjusting this control allows the amplifier gain to be controlled to match and balance both channels.
The RCA input connector should be used when connecting the radio/cassette line out and this connection is usually made by using
RCA-RCA connector wires. 1,3CH connector is used for LEFT channel and 2,4CH connector is used for RIGHT channel.
The high level input of this amplifier has unearthed low impedance circuitry and is used to connect the radio/cassette speaker output signals. Ensure that you observe each channel and polarity marking when connecting the speaker wires.
•
The amplifier can be used in the STEREO and MONO mode as shown in Fig. 4, Fig. 5.
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The speaker wires should be connected to the speaker terminal on amplifier.
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Notice that most speakers have a polarity marking such as “+” or a dot on speaker terminals and these markings denote the positive terminals of the speakers and are used as a guide to phase the speakers. Improper phasing causes a loss of bass response.
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When used in t he MONO mode the speaker wires should be connected to the output terminals of the amplifier as shown.
(Ref. To Fig. 5)
Do not use less than 2 ohm in the mono mode.
•
Too low impedance loads will cause excessive heat radiation from the amplifier and the protection circuit will be operated to prevent damage. In this case, you must reduce the volume to the proper level.
Caution
Be careful not to connect speaker (-) to the ground or chassis.
1. Power Indicator
Indicates that amplifier is on, and no fault conditions exist.
2. Input Level Control
It matches the sensitivity of the amplifier input to the output level of the head unit.
3. X-over switch
When switch is in Low position, amp output is low pass, for subwoofers. When in Full position, amp output is low pass, for subwoofers. When in High position, output is high pass, and frequency is fixed at 80Hz.
4. Line Inputs
Low level input is provided by jacks.
5. High Level Input
Allows common grounded speaker level inputs. If high power speaker wires are used, do not connect negative speaker wires.
6. Fuse
This protects the amplifier from damage if internal failure occurs. Model 4070Xi 30A
7. Power Connection
Connects 12 volt B+ power wire from car battery
8. Remote Connection. Connects to power antenna, accessory, or power amplifier lead from radio.
9. Ground Connection
Connect to good chassis ground.
10. Speaker terminal
Follow drawing as marked for connection to speakers.
SPECIFICATIONS
STREET MACHINE
* Audio Power output per channel, both channels driven at 14.4VDC.
- 4 Ohms 1kHz, THD 0.05%
- 4 Ohms Bridged, THD 0.2%
* Signal to Noise Ratio
* Frequency Response, 10Hz-40kHz
* Crossover: Separate
- High Pass
- Low Pass
- Slope
* Input Sensitivity
* High Input Sensitivity
4070Xi
40W x 4
180Watts x 2
>90dB
10Hz-40kHz, ?
1dB separate variable LO/HI
80Hz
80Hz
0dB-12dB OCTAVE
200mV-4Volts VARIABLE
600mV-10Volts VARIABLE
* Input Impedance
- High level input
- Low level input
* Damping Factor
* Channel Separation
* Power Supply Consumption
(Bridge RMS)
* Fuse Rating
100 Ohm
22K Ohm
180 into 4 Ohm
>70dB
37A
40A
* Dimension (W x
* Dimension ( H x
* Dimension ( L inch
10.3” x 2.5” x 10.1”
** 1. These specifications can be changed without notice.
** 2. Please note that the features shown in this manual may vary from model to model.
We Want You Listening for a Lifetime
Used wisely, your new sound equipment will provide a lifetime of fun and enjoyment. Since hearing damage from loud noise is often undetectable until it is too late, this manufacturer and the Electronic Industries Association’s Consumer Electronics Group recommend you avoid prolonged exposure to excessive noise. This list of sound levels is included for your protection.
Decibel
Level Example
30
40
50
60
70
80
Quiet library, soft whispers
Living room, refrigerator, bedroom away from traffic
Light traffic, normal conversation, quiet office
Air conditioner at 20 feet, sewing machine
Vacuum cleaner, hair dryer, noisy restaurant
Average city traffic, garbage disposals, alarm clock at two feet.
THE FOLLOWING NOISE CAN BE DANGEROUS UNDER CONSTANT EXPOSURE
90
100
120
Subway, motorcyle, truck traffic, lawn mower
Garbage truck, chain saw, pneumatic drill
Rock band concert in front of speakers, thunderclap
140 Gunshot blast, plane
180 Rocket launching pad
Information courtesy of the Deafness Research Foundation.
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