How to connect a two-channel supra amplifier. Working diagram of connecting the amplifier to the radio

Greetings:)

We continue to study the simplest basics of car audio, namely in this article I will tell you how to connect a 4-channel car amplifier in a car on your own, along with a radio tape recorder, battery power, as a load we will have speakers or subwoofers or both) . The material is aimed at beginners, as well as the entire section "Knowledge Base", so there will be visual pictures with detailed comments, we will not study the terms in too much detail. You are already aware of my previous articles in the "Knowledge Base" section. What I want to say is that if you have never connected a car amplifier before or were afraid to "burn" something after reading this material, you yourself can do everything with regards to connecting a 4-channel amplifier - I guarantee you! So let's all go :)

Amplifier power. It has already been said many times about this moment, use wires of a good section; the rule here is the more the better! It will not be worse from thick wires, the main thing is that there are no problems with their laying and installation in the machine itself when connected to the amplifier, in the sense of the terminals. Well, let's say you already have an amplifier and on one of the sides of the amplifier you see the following:

1. +B or B+ or just + This is the amplifier terminal for connecting the power cable to the positive battery bus, BUT not directly, but through an external fuse that should be used a little more than the sum of all the fuses in your specific amplifier, i.e. for example, you have a 4-channel and it has a 2x20A fuse respectively, the total amount = 40A, an external fuse can be used for 45-50A, NO MORE!!! for example, at 100-150A it is not necessary to take it "stupidly" for a 4-channel car amplifier.

2.GND- This is a ground connection terminal or, more correctly, a minus from the battery, moreover I recommend pull this wire from the battery itself, and not anywhere in the car body - everyone knows that the body also rots, there are bad contacts, oxidation, rust, etc. Do you need drawdowns and "farts" in the sound? I'm sure everyone answered convincingly no, so please do it properly if you want high-quality sound. You don’t need to save on wires - it’s better to choose a section with a margin, but also with that guideline so that there are no problems to “shove” this wire into the amplification terminal :) sorry, amplifier.

3.REM/Remout - Usually, a blue wire comes out of the radio, when the tape recorder is turned on, there is a voltage of + 12V on it, the most common of the car’s onboard network is only through a low-power electronic key in the radio itself, so the load is small to hang fans, bulbs, etc. on this signal! Well, I almost said the most important thing, I need this remote to start the voltage converter in the amplifier itself, that is, when the amplifier itself turns on, it works and, accordingly, the indicator on the amplifier usually lights up with a green Power / On glow. The tape recorder is turned off, the amplifier is turned off, when the mafon is turned on, it “wakes up” the amplifier saying “are you sleeping your Lucy) I already want to listen to music :)” and it actually listens to it if it is in good condition, otherwise the protection indicator, usually red, may light up glow and is referred to as a person named Protect. The wire for connecting REM can be used any too large cross-section here "on the drum" because the currents are meager milliamps :)

Well, that's all you need to connect the power amp, if you want to check the amplifier at home or without a car radio, make a short jumper between the plus and REM, you can temporarily put a button so you can turn on the amplifier and you can give sound even from a hundred and check / listen.

For complete happiness, one power supply is not enough for him) he also requires sound from the linear outputs of the radio tape recorder and connect acoustics, it is speakers or a subwoofer - for the latter, one channel monoblock amplifier is still preferable, but it is possible with a 4-channel main without fanaticism.

Connecting the amplifier to the radio using RCA cables. Connect 4 cables to the radio and connect the remaining 4 cables to the amplifier on the other side. rear. Where you messed up, swap it, well, it’s better to do it normally right away than to figure out later why everything doesn’t work as it should)

As an illustrative example in this article I will use a 4-channel amplifier MAGNAT BULL POWER and BOSHMAN

We connect the line outputs in the figure, the details are not enough, because it’s complicated)) it’s all to designate everything here and there You need to look directly at the inscriptions on the cable or the head unit of the radio and one to one connect to the amplifier exactly the same signals to their connectors. Front pair left/right and rear pair left/right. Here you need to buy exactly a cable designed for a 4-channel car amplifier, for a two-channel one, respectively, it will be less in terms of channels - this is usually used to connect subwoofers such as a bass drum. In the picture below, it will be correct to assign channels 1 and 2 to the front, and 3 and 4 to the rear, as you can see, there is nothing complicated) If you have any questions, write in the comments at the end of the article)

There are several types of schemes for connecting the load to the amplifier, the most common are below:

1. The output is connected only to 4 speakers, two to the front, two to the rear.

2. The output is connected to 2 speakers working at the front, the subwoofer is connected to the remaining two channels in a bridge circuit. The most popular scheme for using a 4-channel amplifier.

3. The output is connected by two bridges to two subwoofers / heads, please note that it is very difficult for the amplifier to use a load resistance of less than 4 ohms! or it’s for repair, and then it’s not at all a fact that it will be economically feasible to repair it; it’s easier to buy a new one, but a new one doesn’t mean that it’s usually better in this case, it’s the other way around - take care of the original equipment especially!

We connect the amplifier according to the diagram below for use only on 4 speakers / speakers, it is important to observe the polarity on the speakers + And - and when you connect and control the same correspondence on the amplifier, that is, one to one plus to plus minus to minus, if you confuse the phasing in the interior of your car, and those dynamic heads that are incorrectly connected will move in the opposite direction in discord, that is some forward others back, but they should be like "soldiers in the ranks leg to leg"))

We connect according to the diagram below if you want to use a 4-channel amplifier for both speakers and a subwoofer. The most popular operating scheme and very often in bridge mode they use the wrong load and, as a result, the failure of the amplifier, if you don’t want to rape your amplifier, don’t hook a sub with a resistance of less than 4 ohms to it, I recommend using the load at 8 ohms. It will be "quieter" to some extent in volume, but a significant gain in quality with less distortion, because it will be easier for the amp to cope with the load.

Well, the most tinny :) connect hot, so to speak, according to the diagram below, if you want to use an amplifier for two subwoofer "heads" in one case or two completely different subwoofers but not lower than 4 ohms, always with a bridged connection !!! Yes, there are amplifiers that work with a 2 Ohm bridge, but there are so many of them :) that you can count on your fingers and certainly not released in China.

By the way, many of you have probably heard about subwoofers with two voice coils, yes there are such :) that is, it is physically one subwoofer (one head), but it (th) inside has 2 voice coils and, accordingly, 4 terminals for connecting to the amplifier, usually two red "+" and two black "-" if You are the owner of such a subwoofer, but there is no money for a powerful monoblock :) connecting according to the diagram below: it should be borne in mind that for the amplifier this will be an extremely difficult mode of operation and a prerequisite for the resistance of one voice coil to correspond to at least 4 ohms. There are subwoofers that are approximately the same in appearance, but they have a different connection switching, that is, 2 Ohm or 8 Ohm resistance is switched by jumpers or fuses and only two wires come out as in a conventional speaker - in this case, the only way out of operating such a subwoofer in case of operation in 2 ohm (2 coils of 4 ohms each are connected in parallel), it is preferable to use a powerful monoblock, in the case of a subwoofer operating at 8 ohms (2 coils of 4 ohms each are connected in series), you can connect it via a bridge circuit to any car amplifier, naturally without bringing to distortion (clip) in order to avoid equipment failure.

In the case when the subwoofer has 4 terminals for connection, connect one voice coil with a bridge to the front channel, the other with a bridge to the rear channel, but be sure to observe the polarity of connecting "+" from the speaker to the "+" of the amplifier of one of the channels, and " -" connect the speaker to the "-" amplifier of another channel. Such a switching scheme will increase the power to 8 times!!! Do not reverse the polarity of the speaker windings!

Another example, if you use two separate subwoofers, each one has one speaker with one voice coil installed on board and mix up the wires during connection - you will get such a picture one subwoofer moves forward the other back, nothing will burn out in the subwoofer or in the amplifier, but this will affect the quality of the "musical picture" as a whole - so be careful, because in fact you need to pay attention only once, connect everything correctly and no longer bother about this issue.

Well, actually, that's all for connecting a 4-channel car amplifier, I hope I put it on the "shelves", now everything should be simple and clear.

Sincerely, Ivan, site I wish everyone and everyone the right installations of 4-channel amplifiers.

Thank you for watching)

Some motorists are not satisfied with the sound quality of the standard multimedia system. In this case, it is not necessary to change the speakers or audio system in the car. The situation can be improved by installing a power amplifier. Having selected the device for your needs, it remains to install it and connect it correctly to the radio, following the step-by-step actions.

Why do I need an amplifier for the radio in the car

Installing an amplifier in addition to the radio will not only increase the overall power of the audio signal, but also improve the sound quality. Plus, you can connect a subwoofer to the amplifier. Using an amplification device allows you to optimally tune the sound of your car audio system. By connecting the amplifier through a crossover, the sound is perceived better in the entire frequency range. It is important to understand that the voltage of the car's on-board network does not always correspond to 14.4V, which is necessary to ensure maximum amplifier power. In particular, this situation manifests itself when using a subwoofer: the output voltage of the amplifier at a lower supply voltage cannot drive a powerful load in the form of low-frequency (low-frequency) dynamic heads.

The indicated problem is solved by installing high-capacity electrolytic capacitors (1F). This element accumulates the necessary discharge and at peak load does not allow the bass to “sag”, i.e. the signal is juicy, clear, without any distortion. In order to be able to connect a subwoofer to an amplifier, the devices have a special output for a subwoofer. To improve sound quality, it is not necessary to replace the head unit and speakers. In this case, you just need to install a four-channel amplifier, which is endowed with compact dimensions and has a fairly high output power. If you seriously approach the re-equipment of the sound part of the car, then connecting an amplifier will not be difficult.

It is worth noting that many cars are equipped with regular audio systems with mediocre quality speakers. In order to achieve really high sound quality, you need to think not only about purchasing an amplifier, but also about replacing standard dynamic heads. Each car owner has the opportunity to choose the location of the speakers, as well as additional components. Many are quite satisfied with the installation of speakers with tweeters and tweeters in the front of the cabin. To install such a system, you will need a four-channel power amplifier.

How the amplifier works

To understand this, it is not necessary to delve into its electrical circuit and find out what elements it is assembled from. It will be enough to consider what happens to the signal when it enters the amplifier from the radio. It is generally accepted that the signal to the amplifying device is supplied with a small amplitude, after which it increases to a certain value. This reasoning is true, but only partially, since the amplifier creates a new signal, which is a copy of the input.

The signal is fed to the amplification device from the standard radio, increases to a level that ensures the normal operation of the speakers. As a result, the input and output signals differ only in power characteristics. Regardless of the amplifier, the design will have three main nodes:

1. input schema.
2. Power supply (PSU).
3. output stage.

Each sound source has a certain output voltage level. For example, one radio tape recorder produces a signal at a linear output with a voltage of 1V, the other at 3V. In this case, the amplifier must process signals with different levels. One signal, as a rule, is processed by standard devices and some amplifier models. However, most devices are capable of processing two input signals. If they have a high level, then they are fed directly to the load, at a low level, they first pass through an amplifying device.

It is important to know that the sensitivity of the input node must correspond to the level of the signal that is supplied from the radio. In the amplification device, the input sensitivity is adjusted, which determines the gain. If the input sensitivity is too high, the output signal may be distorted. In this case, it is controlled by the volume control on the radio. For a better understanding, we can say this: the sensitivity is adjusted in order to eliminate the discrepancy between the output levels in the car audio system. The correct adjustment of the sensitivity can be judged by the absence of distortion in the dynamic heads.

A node such as a power supply is designed to convert the voltage from the battery to a higher one. The need for such a voltage arises as a result of insufficient power from the on-board network to drive the speakers. One of the functions of a car amplifier is to increase and control the supply voltage. For this, a transformer is used in the power supply. Since the audio signal is variable, two voltages are required to operate the load (speakers): positive and negative. For their implementation, two voltages with opposite polarity are removed from the transformer. Combining these oscillations, you can get a variable signal.

If the PSU outputs +25V, then it must also output -25V, which is necessary to power the amplifying device. In the given example, the voltage difference is 50V. Having calculated the power according to the formula P \u003d U² / R, where P is the power of the amplifier, U is the voltage, R is the load resistance, with a supply voltage of 50V and speakers of 4 ohms, we get a power of 625 watts. The greater the difference in the power supply voltage of the PSU, the more power can be removed from the amplifier.

The output stage directly amplifies the input signal, which is then fed to the dynamic heads. The main element of the output node is high power transistors that operate in key mode, providing increased voltage from the PSU to the output of the amplifying device. This is realized by converting the voltage from the power supply into the required signal form. The transistors are controlled by an input signal: the voltage from the PSU takes the form of an audio signal, i.e., the transistors turn on or off depending on the input signal.

Types of amplifiers

Before you get ready to buy an amplifier, you need to find out what these devices are. Today, a large selection of the equipment in question is offered, but their main difference is the number of channels. There are amplifiers from one to six channels. In addition, devices are classified according to the method of signal amplification: analog (AB) and digital (D). Digital devices are capable of delivering high power with relatively poor signal quality. Analog, on the contrary, are characterized by low power with high quality.

Amplifier characteristics depending on the number of channels:

1. Single-channel. Mainly used for subwoofers. This type of amplifier is designed for a nominal load of up to 2 ohms. For larger loads, it is recommended to use a two-channel amplifier. A positive feature of such devices is ease of use. Since car radios do not have a bass volume level, single-channel amplifiers are equipped with a special volume control with which you can customize the audio system for yourself.
2. Dual channel. Designed to connect two dynamic heads with a higher power value than for a single-channel amplifier. A single high power speaker can also be used as a load.
3. Three-channel, although rare, can be found. They were replaced by four-channel devices.
4. Quad amplifiers are the most popular. They can be used for four speakers or used in two-channel mode and even connect a subwoofer. It is possible to connect two speakers and two subwoofers.
5. Five-channel allows you to connect four speakers and one subwoofer.
6. Six-channel for a car audio system is rarely used, since four speakers and one subwoofer are mainly used. In addition, such an amplifier is able to quickly discharge the battery.

How to choose an amplifier

After reviewing the types of amplifiers, it will be possible to decide which device is best suited for your audio system. It remains to give preference to one or another manufacturer. If you really want to get high-quality sound, then it is better to pay attention to the following brands: Infinity, Alpine, DLS, JL Audio, Audison. In addition, it is desirable that the amplifier be equipped with a fan and various signal level controls. It is worth remembering that a significant indicator is the sound quality, but not the power. The presence of an equalizer will not be superfluous at all, which will allow you to customize the sound to your liking. At the same time, you need to understand that a larger number of functions leads to an increase in the cost of the device.

How to install

After the amplifier is purchased, you need to choose a place for its installation and perform the correct installation, taking into account possible nuances. You should not install the device in the first place you like: most likely it will not be the best option.

Choosing the right place

Depending on the location of the amplifier, the length of the connecting wires will depend. It should be noted that when installing in the luggage compartment, you will need wires to connect the radio to the amplifier and subwoofer. On average, you will need about 5 m of wire for the multimedia system and 3 m for each speaker, which depends on the specific machine. Calculations are made in advance, since the laying of wires will be carried out under the skin.

When choosing a location, it is important to consider that the amplifier generates a lot of heat, so normal air circulation is welcome. It is necessary to avoid mounting the device in a side position or upside down, it is also necessary to exclude air obstruction, which is possible when covering with a rug or things. One option for installation space may be the space under the driver's seat. In this case, it will be possible not only to save on the length of the wires, but also to improve the sound quality, since with a longer length, part of the signal is lost.

In fact, there are a lot of options for mounting the amplifier, so it’s worth stopping at least briefly on each of them:

1. Front of the cabin or center. This option is optimal (vehicle dependent) as good coupling to the load can be achieved, resulting in an extended crossover frequency level.
2. In the trunk. If it is planned to install two amplifiers, then one is installed in front, the second in the luggage compartment. The connection will require longer wires, but the location of the device will not take up free space.
3. Rear shelf installation. The option is relevant for a car in a sedan or coupe, while the shelf must be strong.
4. Under the passenger or driver seat. There will always be free access to the device, which will ensure quick dismantling if necessary.

Wires for mounting

One of the important elements in connecting the device are wires. They are necessary for power supply and interconnection. Additional wires may also be needed. To supply power, the wire is selected according to the power of the amplifier. To this figure should be added another 30% for losses due to low efficiency. If we consider as an example two two-channel amplifiers with a total power of 200 watts, then at the maximum volume level they will consume 260 watts. Based on the data obtained, it is possible to determine the cross section of the wire, which depends on the current passing through it. To do this, we turn to Ohm's law: I \u003d P / U, where I is current, P is power, U is voltage. Since the battery voltage of the car is 12V, after performing the calculation, we get a current of 21.6A. It is recommended to buy wires with a margin, paying attention to the quality of the insulation.

Fuse

Since the power cable runs in close proximity to the body, a mandatory element in the amplifier connection diagram is a fuse, which in the event of a short circuit will prevent fire. The amplifier itself has protective elements, so it is recommended to install the power cable protection fuse near the battery. The element chooses in most cases with a face value of 50A. It is forbidden to install a part with a large value.

There are different types of fuses, but the most common are AGU and ANL. The former are used by amateurs because they have a low cost. The design is a glass cylinder, on which a metal tip is displayed, and a fusible insert is located inside. The design features of such fuses are their disadvantage. The problem is that the part consists of several parts that are connected by a fusible metal element. During operation, the fuse oxidizes and simply fails with constant vibrations. In addition, the contact in such a protective element is very unreliable. As for the ANL fuses, they are free from the listed disadvantages. The part is made of an all-metal plate, it is securely fastened in the retainer with the help of bolts. The chance of failure is minimal.

Interconnect cable

The sound from the radio to the amplifier is supplied using an interconnect cable. The quality of the signal that comes from the source directly depends on this element. You should not rely on inexpensive options or those that come with an amplifier: first of all, they are thin, the shielding is poor, and the insulation itself is weak. A high-quality wire must have strong insulation, solid shielding, and a good central core. The RGA connector itself must also be of high quality. When choosing wires, you can pay attention to manufacturers such as Tchernov Cable and Daxx. From the tools for installing the amplifier, you will need a set of screwdrivers and a wire stripping knife.

How to connect with your own hands

With a standard connection, the power wires are connected directly to the battery. Plus is connected to the positive terminal of the battery, minus - to the car body. Power is supplied to the amplifier and connected to the appropriate inputs: the positive wire (red) is connected to the amplifier socket, which is marked with the supply voltage. Negative (black) is connected to the GND connector. A signal wire is connected to the Remote jacks from the signal source, i.e. from the radio. In some circuits, a capacitor may be used, but, as a rule, it is installed complete with powerful amplifiers.

Step by step connection process

Having dealt with the connection diagram and having prepared all the necessary tools and materials, you can proceed to the process itself.

1. We install the amplifier in the place where overheating, obstruction of air exchange and getting wet will be excluded.

Let's start laying wires. First of all, it is necessary to lay the signal and additional wires going from the radio to the amplifier. Each car owner must decide for himself how to do this better, since there are no universal recommendations. In any case, you will have to remove the decorative trim of the cabin in order to lay the wires beautifully. It is important to know that the interconnect wire should not come into contact with the vehicle's wiring, which is energized.

2. We stretch the power cable to the amplifier from the battery. It is convenient to place it along the regular wiring. The fuse is installed near the battery at a distance of no more than 30 cm.
3. We connect the signal cable: on the radio into the Line-out connector, to the amplifying device into the Line-in connector. We also connect the power cable.
4. We connect an additional cable to the Remote connector on the amplifier and to B + Ant (blue) on the signal source.
5. We connect the amplifier with the speakers. If the connection is made according to the bridge circuit, then one channel of the amplifier is connected to the "+" load terminal, the other to the "-".
6. We install a capacitor near the amplifier (if necessary). The connection to the amplifying device is made with short wires.
7. Set up the amplifier in accordance with the manufacturer's recommendations. The adjustment depends on both the amplifier and the radio itself, the presence of a subwoofer in the audio system.

Connecting an amplifier to a radio without tulips

What if the radio does not have tulips, i.e., a linear output? As a rule, standard devices do not have such connectors. The connection process becomes more complicated, but the problem is still solvable and a matching adapter is used for this. To implement a linear output into the radio, perform the following steps:

1. Purchase a line-out adapter. The device allows you to match the output signal with the input of the amplifier.
2. Remove the radio and attach an adapter to it, which will allow you to connect it to the amplifier. After connecting the input wires of the adapter to the radio, set the value of the output signal, which must correspond to the characteristics of the amplifier.
3. The adjustment must be done carefully, because it depends on how good the sound will be.
4. The adapter is taped to the harness with wires. To avoid the appearance of knocks on the body of the device against other structural elements, the adapter is wrapped with foam rubber and fixed with electrical tape.
5. A signal cable is connected to the output connectors of the adapter, and power wires are connected to the amplifier. Line wires are connected in accordance with the marking. After turning on the amplifier, you need to pay attention to the sound of the speakers: each should sound in accordance with its channel and location.
6. Check the balance ratio: turning the knob to the right position - the sound should be observed only in the right speakers, in the left - in the left ones. In addition, it is necessary to check the output signal level: the volume control is set to approximately 70% of the maximum value, after which the volume is reduced to a minimum. If no distortion was observed in the sound signal during the performed manipulations, then the connection was made correctly.

How to connect two or more amplifiers

As a rule, two or more amplifiers are connected by those who want to achieve high sound quality and increase signal power. However, there are some difficulties with this option:

• with power connection;
• with RCA cable connection to several amplifiers;
• with remote activation of amplifiers.

If the installation of the first amplifier was carried out without a capacitor, then with several devices it still has to be installed. The scheme, in accordance with which the power supply of several amplifiers will be organized, is selected based on their power. You can connect two amplifiers using one capacitor, connecting it in parallel with the battery. As for connecting an RCA cable, you need to proceed from the requirements for a particular amplifier. For example, when two amplifiers are connected, the same frequency band is reproduced. In this case, it is enough to use the output connectors on the devices themselves, if any. You can also separate channels by input using a crossover.

To remotely turn on the amplifier, a +12V voltage is applied to the REM connector of the device, power is taken from the antenna on the radio. The problem with connecting multiple amplifiers is that the load on the head unit can be too large. At best, the amplifiers will not turn on, and at worst, the radio tape recorder may fail. The situation can be solved by installing a relay on the remote switching circuit. The element is connected quite simply: when the head unit is turned on, the relay is activated, +12 V is supplied through it to the REM connector of the amplifiers.

Video: how to connect an amplifier with your own hands

Do-it-yourself installation and connection of an amplifier is not a time-consuming procedure. Even if you are faced with this for the first time, it is enough to purchase the necessary items and familiarize yourself with the step-by-step process. The main thing is to choose the right place for installation, when connecting, observe the polarity of the power supply, make the connections reliable and, upon completion of work, check the connection diagram. It remains to check the performance of the device.

Here is a schematic diagram of a four-channel amplifier SUPRA SBD-A4240.

(To view the scheme in its original size, click on the picture. The image will open in a new window)

In the output stages of audio frequency amplifiers (UMZCH), field N-channel MOSFET transistors are used RFP50N06 or analogues.

In practice, in these amplifiers, instead of RFP50N06, IRF60NF06, as, for example, in the copy that is in the photo. Diodes are used as dual rectifier diodes D27, D28 F16A20CT(common anode), F16C20CT(common cathode).

Appearance.

Appearance of the SUPRA SBD-A4240 amplifier with the cover removed.

The output transistors of the audio frequency power amplifier (UMZCH) are MOSFET transistors IRF60NF06.

Inverter (power supply) car amplifier Supra SBD-A4240. The one that converts the 12V unipolar voltage from the battery to the 23-25V bipolar voltage required for the amplifier to work. More about him.

In the photo 3 mosfet "and one of the arms of the DC-DC converter.

Block of input filters on operational amplifiers KIA4558.

Preamp stages and powerful output transistors UMZCH. Actually, these are the very 4 amplifiers. As you can see, there are four sectors on the printed circuit board. Each sector is a separate amplifier.

How to connect a subwoofer to a 4 channel amplifier

How to connect a subwoofer to a 4 channel amplifier so that the power is not affected by this? What needs to be done so that the subwoofer connection scheme to a 4-channel amplifier is fully and correctly implemented?
All these questions require answers, which we will try to give in the article.

What is an amplifier for?

The audio system, as you know, has long been of interest to the driver. If earlier more attention was paid to the chassis or the technical serviceability of the vehicle, today, on the contrary, comfort.
And car audio in this regard is one of the leading positions. In order for the audio system to play at full power, they have recently become a separate speaker that reproduces low frequencies.
Its connection goes through an amplifier. To date, there are three types of amplifiers installed in a car.

Note. The amplifier is installed in the car so that the driver and his passengers can fully enjoy the sound of music or watching a movie or video. For this reason, a well-chosen and mounted amplifier is of great benefit.

Of the above types of amplifier, 4-channel is considered the most popular, because it can be used for both 4 and 2 speakers, as well as a subwoofer. In addition, a 4-channel amplifier can also be used to connect 2 subwoofers.

Note. The best and most common manufacturers of high-quality 4-channel amplifiers are models of the brands Alpin, Blaupunkt, Magnat, etc.

A 4-channel amplifier can be of two more classes:

• AV amplifier (see), that is, analog, with high gain quality, but low efficiency and low power;
• D digital amplifier, already with high efficiency and high power, but low quality.

Connector groups

On a 4-channel amplifier, there is not one, but several groups of outputs.
Let's consider them in more detail:

• Power connectors or outputs for power supplies.
• 12V outputs powered by battery. When connecting wires to these contacts, it is also recommended to install a fuse at a remote distance from the battery.
• REM output, where the control cable from the head unit is connected.
• Output 1.3 GND or simply ground. Designed to connect to the mass of the machine.
• Inputs for speakers and subwoofers, with plus/minus contacts.
• Outputs lineinput and output are linear for RCA or simply tulip wire.

Instructions for setting up a 4-channel amplifier

Generally, there are three types of amplifier tuning to be aware of. All of them are listed below.

Amplifier setup for four speakers but no subwoofer

So:

• The filter / crossover of the amplifier is turned off, and only the speakers reproduce the entire frequency range.
• Set the Crossover Selector to Flat.
• The level is set to 8V.
• Bass Boost is set to 0dB.
• Now on the car radio it will be necessary to increase the volume, but not more than 90%.
• The equalizer, if it is not configured, is set to position 0 according to music styles.
• We connect the amplifier and slowly turn the Level clockwise to the end.

Setting up an amplifier for a subwoofer and speakers

So:

• Crossover The Front Selector on the amplifier is set to HP.
• Phi Pass is set to 60Hz-80Hz.
• Crossover Selector Rear install on LP.
• Love Pass is tuned in the frequency range 65Hz-85Hz.
• Level is set to 0.
• Bass Boost is also at 0dB.
• As with the above-described setting, the Level is rotated to the end, but with sensitivity adjustment.

Setting for local gain

So:

• Crossover Selector is set to Flat.
• Turn on HP for tweeters.
• Turn the Hi PASS knob to 250Hz.
• We set up the amplifier with the Level wheel.

Note. If the car radio in the car is a new version, the amplifier may not need to be tuned. In such radio tape recorders, automatic Bass Boost settings are already set. If this is the case, then you just need to set up the Level spinner.

Scheme of connecting a passive subwoofer to an amplifier for 4 channels

To connect this type of speaker to a 4-channel amplifier, you will have to use a standard circuit.

So:

• First, the subwoofer and the rest of the speakers are connected to the amplifier.
• Then the amplifier is connected to the car radio.
• Having received a signal directly from the car radio, the amplifier distributes it. Part of the signal is sent to the sub, part to the tweeters.

Note. Often a subwoofer is placed in the trunk of a car. In view of this, it is necessary to stretch cables there through the entire cabin. In this case, the path from the battery to the trunk is implied, and so much cable must be calculated.

• When laying cables, it is necessary to ensure that the positive wire is necessarily protected by something, for example, corrugation. Basically, it means protecting the part that is in the engine compartment, as close as possible to the battery.

Features of connecting a subwoofer to an amplifier

So:

• The power cable must be connected to the amplifier, before preparing the technological hole. Often this very hole already exists in cars. It is either closed with a rubber plug, or, as in domestic cars, remains open.
  If the hole could not be found, then you can make it yourself using the right drill and drill. It is recommended to insert a rubber grommet into the hole so that the wire does not fray in this place.

• The wiring must be laid in the engine compartment, finding the standard wire harness. It is necessary to bring the necessary wire to the salon.
• The amplifier will be in the trunk of the car.

• 2 wires must be connected to the amplifier: plus and minus.
• After that, as soon as the amplifier receives power from the battery, we run the cable to the head unit (car radio). Standard tulips and a special wire are used as a cable - thin and single-core, responsible for power management of the amplifier (in many cases, a blue wire).
• We connect tulips and wire to the back of the car radio, which must be removed in advance.

• We stretch the cable through the salon and connect the RCA connectors to the amplifier.
• Now it remains only to connect the subwoofer. The amplifier is 4-channel and therefore you can connect a woofer, depending on which one is used.

The instructions above will help many times more if, in addition, you watch a video review and photo materials. If you do this whole operation with your own hands, you will be able to save a lot on costs, because the price of such a service in a service station is very high.

How to connect supra subwoofer

How to connect a supra subwoofer, many are wondering. Indeed, by performing such a process on your own, you can save a lot of money that will be invested in the car in the future.
Why pay someone to do something you can do yourself? But let's get it right. The supra srd t30a subwoofer is connected according to the instructions.

Why you need a subwoofer

The sub is a very important element of any. Of course, the acoustics sound good without it, but with it the sound improves several times.
With it, the sound of low frequencies goes to another level. The actual use of such a device is for those who love big basses.
But it is not recommended to install an unsuitable buffer in the machine, as this can lead to various consequences. For example, due to constant rattling, windows will become less resistant to outside influences.

Frequency Differences

As you know, there are three types of bass: low, medium and high. Combining them in one dynamic is simply impossible.
Therefore, if the presence of all of them is necessary, then various details are used for this. For HF, special tweeters are used that can even reproduce ultrasound. But LF and MF sound good only when using speakers with monolithic bass.
Installing speakers to reproduce high and medium frequencies is not a problem. In the process of work, a minimum of questions may arise, so anyone can cope with this task. But installing a subwoofer is a simple matter.

The main difficulty in installation is its placement. After all, usually the speakers for low frequencies are quite large, so it is difficult to find a suitable place for it. Problems can also appear during the sound tuning process.

Types of subwoofers

There are two types of woofers on the market:

• Passive, which is most often placed in a wooden case. Due to this, the sound quality of musical compositions is significantly improved. In no case should you connect such a device directly to the speaker system.
  To do this, use a special fuse. Otherwise, a short circuit may occur in the system, as a result of which all its elements will burn out. In addition, the speaker does not have a built-in amplifier. Therefore, you should mount an additional one, because otherwise the sound power will be minimal.

Note: Some radios have a built-in subwoofer amplifier. Only in such cases it is possible to connect a passive woofer directly to the device. This process is quite complicated, so for its implementation you should understand the instructions.

• The advantage is that it already has a built-in amplifier for sound. As a result, there is no need to buy an additional device (although this can be done if necessary, since it does not interfere in any way).
  Its installation is very simple. After all, it can be immediately connected to the head unit of the car. In this case, setting up the sub will include just a few simple manipulations. It's hard to say about the cost. Since some models are more expensive, others have a lower price.

Installation process

As noted above, installing subwoofers (both active and passive) is not the easiest process.
Be sure to stock up on the following materials:

• Knife. It may be needed when working with cables;
• Screwdriver for dismantling the radio;
• Wrench.

The process consists of several stages, each of which is very important:

• Remove the negative battery terminal. Otherwise, the wiring may close, and this can lead to the combustion of not only the battery, but also all the devices in the car;
• The power wire must be carefully pulled from the engine compartment through the passenger compartment to the trunk, where the buffer is installed.

Note: If the hole cannot be found, it may be covered by a rubber plug. It is used to prevent foreign particles in the form of dust and dirt from entering the interior.

• Spend, making sure that he does not cling to anything anywhere. Otherwise, it may be slightly deformed while riding;
• If it is already stretched, then the next stage is its fixation. For this purpose, it is recommended to use special elastic cords that will securely hold the wire;
• Remove head unit. If it is not regular, then it is not necessary to remove it. After all, factory models usually have built-in amplifiers, while purchased ones do not have them. Therefore, dismantling the car radio is a waste of time;

• If, nevertheless, it was decided to remove the radio, then in this case it is recommended to look at all the connectors that are on it. Particular attention should be paid to the subwoofer outputs;
• Connect the cable through this connector. You can also connect the SRC wire to the machine. It is less thick and longer. Its main task is to turn the amplifier on and off without extraneous manipulation. If this cable is not run, then the amplifier (see) will not work;
• Run negative wire. Any black cable can be used for this purpose. Its connection should be carried out close to the subwoofer, and then connected to the speaker;
• Connect all the wires, install the radio tape recorder in the standard hole;

• Install fuse. Its importance in acoustics is very great. It protects the system from short circuits;
• Lay the floor of the cabin;
• Check if everything is working properly. If any element of the speaker system does not function, you will have to disassemble it and double-check everything again.

The process of installing a sub, of course, is quite complicated. But it is quite possible to do it yourself.
Moreover, the price of such work in a car service can reach 2-3 thousand rubles. Why spend extra money? Before starting work, you should collect suitable photos to help, view a thematic video. Our instructions don't hurt either.