A car subwoofer capacitor is becoming increasingly popular among car owners. Now the installation can be found not only in expensive audio systems, but also in simple sets of audio equipment that use external sound amplifiers.
Do you need a capacitor for a subwoofer? Drivers who understand the meaning and functionality of the device answer unequivocally: of course it is needed. Since this device significantly improves the performance of the amplifier, as well as the quality of the sounds produced.
Operating principle and purpose
The operation of a capacitor for acoustic systems is based on the law of conservation and accumulation of energy of the simplest element found in many electrical circuits. The simplest capacitor consists of two conductors with a dielectric between them. The length of these conductors, depending on the capacity, can reach from one meter to several tens, as well as the dielectric located between them. This entire design is very compact, so even with such a huge capacitance for electronic devices as one Farad, the dimensions of the capacitor for the subwoofer allow it to be placed in a car.
The principle of operation of a car capacitor connected to the power circuit of an amplifier or subwoofer is that in normal mode, when the supply voltage is at least 12 Volts, it is capable of accumulating an electrical charge. When a fan of loud music turns up the regulator and increases the power of the audio system, the current in the power circuit increases greatly and can reach up to 100 Amps, and a voltage drop occurs, since neither the generator, nor, especially, the battery is designed to work with such a large constant load. Moreover, in the car circuit, especially at night, there is already a load caused by the switched on lighting devices, wiper motor, air conditioning and other devices, depending on the configuration of the car’s electrical equipment. When listening to powerful bass, the acoustic capacitor for the subwoofer will compensate for the decrease in the supply voltage, that is, its drawdown. Without this device, the voltage at some points will drop to 8-9 Volts, which is unacceptable both for installed stereo systems and for the entire on-board circuit of the car.
Thus, we can identify several obvious signs that will be noticeable to the driver due to the absence of a high-capacity capacitor in the subwoofer power circuit:
- Flashing headlights in time with the music;
- Increased fuel consumption associated with increased load on the generator;
- Disabling or significantly reducing the sound quality of the audio system with increasing power and especially with strong low frequencies emitted by the subwoofer.
Methods for selecting a capacitor for powerful speaker systems
In order to choose the right acoustic capacitor for a subwoofer
you need to take into account the maximum and operating power of the sound amplifier. For 1000 W of stereo system power, a capacitance in its power supply circuit is required equal to 1 Farad. This is a very large capacitance that can compensate for the voltage drop; mainly in electronics you can find capacitors whose capacitance is measured in microfarads.
Also required for stable operation of the system is an electronic circuit built into the device body, designed for:
- voltage indication in the amplifier power circuit;
- supplying energy from a backup energy source (capacitor) at the desired peak moment of drawdown;
- adjusting the amount of energy to protect against blown fuses.
An acoustic capacitor for the subwoofer is connected in parallel to the power circuit, being sure to observe polarity and minimize its distance from the amplifier terminals.
Review of the most common acoustic capacitors
Brax IPC
- from connection with incorrect polarity;
- from overvoltage, that is, if the voltage rises above 17.5 Volts.
It is equipped with a bright three-digit indication of the voltage value of the amplifier supply circuit, which displays the average value for a time of 1.5 seconds, which is very pleasant and distinguishes this model from cheaper ones. There is also an indication that the protections described above are enabled.
Power Ampere SPV 100D
Signat ECC1
. Listed market price $230. It is compact, since its diameter is 7 cm. The process of fully charging the acoustic capacitor is notified by 5 LEDs of different colors. Charging time and ability to work in normal mode is about 1.5 minutes. An emergency shutdown occurs when the supply voltage on the subwoofer increases to 16.5 V.
Thus, lovers of creating powerful car audio will have to fork out for another necessary tool to obtain high-quality sound and maintain the car’s on-board voltage system in normal mode.
Top 5 devices of 2022
Based on consumer reviews, the 5 best capacitors for a subwoofer have been selected, showing good results and a long service life. These include products from well-known brands, suitable for use by both novice and experienced car audio engineers.
Kicx flc 1.5
pros
- good equipment
- contacts for ring terminals
- reverse polarity protection
- charge level indication
Minuses
- weight, dimensions
- capacity is only 1.5F
- low operating voltage margin
From 2339 ₽
The main advantage of this capacitor is its complete ease of installation. Convenient complete brackets and a reliable contact group are provided. The product shows excellent service life thanks to electronic protection and a special mesh.
MD.Lab PC-E1.0
pros
- 1F capacity with small measurement error
- compact aluminum housing
- built-in voltmeter
Minuses
- no reverse polarity protection
- small margin for maximum voltage
- poor equipment (only capacitor)
From 2240 ₽
This drive can only provide 18 V pulse voltage. If this is enough, the device will appeal to experienced audio system designers. The capacitor can operate at temperatures from -40 to 60 degrees Celsius and has low leakage currents.
ACV CAP-5.0F
pros
- overload protection
- protection against incorrect activation
- amplifier integration option
- possibility of connecting several series-connected load units
- advanced electronic parameter control system
- indicator light and built-in voltmeter
Minuses
- dimensions
- low pulse voltage value
- own connection diagram
- awkward terminal blocks
From 3875 ₽
The most complete control of voltage and operating parameters available today, as well as the possibility of direct control from the amplifier are two striking features that distinguish this capacitor model. It will appeal to users who want to create a truly powerful system. A capacity of 5F is enough for acoustics of 5 kW.
Why do you need a capacitor for a subwoofer?
Fans of loud, high-quality music with powerful bass often encounter problems when sound drops occur in certain situations. In such cases, there is no need to risk breaking the subwoofer or speakers.
Let's go back to school physics lessons somewhere in the seventh grade. , when playing powerful bass, it can briefly consume current that even the strongest battery cannot provide. The wires connecting the subwoofer and the amplifier, even if they are very thick, have resistance, which at the peak of the signal leads to a decrease in voltage. At these moments, the so-called sound failures occur. It is at such moments that a capacitor for a subwoofer is needed. It is a high-capacity electrolytic device that is connected in parallel to the amplifier and car battery. When connecting nodes in parallel, during current peaks, the device absorbs excess voltage, which helps smooth out the so-called dips of the subwoofer. Due to the very low internal resistance of the capacitor itself, it charges in a split second and absorbs subsequent voltage surges.
What equipment capacity is needed?
There is no exact formula here. Many follow this rule: 1 kW. from the power of the amplifier must correspond to 1 F of the capacitor capacitance. This is normal and most users purchase the design precisely for this reason. For example, if your car has an audio system with a power of 2 kW, then you need to purchase a drive with a capacity of 2 Farads. But experts recommend choosing a device with a large supply of capacity.
Subwoofer amplifier and capacitor
Some models have built-in voltmeters. They control the system voltage level. Devices with voltmeters are more expensive.
Main characteristics
The subwoofer drive is used not only in high-end audio systems, but also in conventional ones. This technique can significantly improve the properties of the amplifier. Modern subwoofers consume quite a lot of electricity at peak moments of the audio signal. Even the most advanced battery cannot quickly supply significant current. The gadget in question is used to solve this problem.
Also, do not forget about the operation of other electrical appliances in the car. For example, an air conditioner, which can absorb up to thirty percent of the energy generated by the generator. This often leads to sound distortion, especially when delivering powerful bass. A car subwoofer drive solves this problem. It is an electrolytic type capacitor, the capacity of which is sufficient to accumulate electric current. This device is used to supply energy to the subwoofer.
The equipment is installed in close proximity to the amplifier. It is often equipped with voltmeters and charge indicator lights. The equipment set includes everything necessary for installation. Note that the capacitor and amplifier should be located at a distance of no more than fifty centimeters. The connectors of the equipment in question are most often gold-plated. This is necessary to reduce resistance as much as possible. The operating voltage of the equipment can reach twenty-four volts.
From us you can buy a subwoofer drive of various models. Our specialists will help you choose the device that best suits your audio system. The price of a gadget directly depends on its characteristics and the company offers a wide range of these devices. Therefore, choosing a subwoofer storage capacitor will not be difficult at all.
general information
Capacitor for a subwoofer and what it is for
A capacitor in acoustics (see Why a capacitor is needed for car acoustics today) is a component that serves as an additional power source for an amplifier. This element is very important and has the following features:
- Thanks to him, the amplifier always receives energy when absolutely necessary. The fact is that in acoustics there is such a thing as linear drop. This happens at times of peak load on the subwoofer and amplifier. At this moment, the battery is not able to provide them with the required amount of energy and then the capacitor comes to the rescue;
- It's not just about powerful bass drivers. Almost all modern subwoofers are capable of consuming significant current during short-term peaks. No matter how powerful the battery is, it is clear that it will not cope with this task.
Note. And here it’s not even a matter of cables conducting current to the amplifier. Whether they are thin or thick, it doesn’t matter, at the moment of optimal load on the woofer, this happens. And as a result, so-called failures arise, which negatively affect the overall reproduction of music.
- In addition, the battery and generator de-energize the air conditioner in the summer, which takes up to 30 percent of valuable energy.
Capacitor for a subwoofer and why it is needed
So, the capacitor is able to solve the problem with dips, since it is a high-capacity electrolytic device, the connection of which occurs in parallel with the power supply circuit of the amplifier. The capacitor has practically no resistance, or rather, it is so small that the current is given to the amplifier instantly, thereby eliminating the occurrence of dips. Then, with the same speed, the capacitor is charged again and is ready to give out the next portion of the beneficial current for the amplifier.
Note. Modern capacitors have a very large electrical capacitance, expressed in farads. It is often compared even with the capacity of the globe. Since the capacitors are placed near the amplifier, the distance between both components should not exceed half a meter. In addition, the capacitor connectors must be gold plated to be able to reduce the resistance. Often, capacitors are equipped with digital components, such as a voltmeter or LEDs (mostly expensive models - more about them below).
Connecting a capacitor to a subwoofer
When choosing a capacitor for a subwoofer, you need to pay attention to the presence of a voltmeter, which allows you to measure the current performance of this element. In high-quality capacitor models, the connectors for connecting the amplifier are in most cases gold-plated, which minimizes electrical losses and reduces resistance in the electrical circuit
In high-quality capacitor models, the connectors for connecting the amplifier are in most cases gold-plated, which minimizes electrical losses and reduces resistance in the electrical circuit.
In most cases, the subwoofer is placed under the seat, and the electrolytic capacitor is placed in the trunk near the amplifier. It is believed that the distance between the capacitor and the amplifier should not exceed 50 centimeters.
In this case, the appearance of this element will be important. As a rule, they consist of several completely transparent glass flasks. Today you can find numerous models of automobile acoustic bulbs on sale.
They differ in the components used, the eclectic capacity indicator and their appearance. We recommend choosing products from those manufacturers who specialize in the production of car acoustics, which will allow you to make the right choice.
To equip your car with a good audio system, you need to take into account all the nuances. You must definitely buy a drive for your car with sufficient power. This equipment will allow you to “squeeze” the maximum out of the audio system and make the sound high-quality and pleasant to the ear. Below we will talk in detail about this technique.
Sub
Which amplifier to choose for a subwoofer
The most difficult speaker to artificially amplify is the sub. It is for this reason that so many large-sized subwoofer amplifiers are produced today. They are designed specifically for amplification of low frequencies. Here is what is recommended to know for those who are thinking about improving the sound of a subwoofer:
- 1-channel or mono amplifiers are capable of operating with a wide range of impedances. Such devices have a special tone setting, separate filters that help thunderous bass erupt at full power;
- 2 and 4-channel “amplifiers” are also capable of subwoofer amplifiers, but they are not able to cope with the effect of low impedance. They quickly overheat as soon as the sub starts playing at full power.
How to choose an amplifier for a subwoofer
The ideal amplifier option for a low-frequency driver, which will enable the subwoofer to produce an excellently balanced sound, is a device characterized by the following parameters: 50-200 watts.
https://youtube.com/watch?v=x2hMrOoDY_s
Review of capacitors for a snack
Brax IPC
Capacitor costing 300 US dollars. The model name IPC stands for “intelligent power capacitor.” It has the following features:
- The user will find in this model a luxurious, superbly finished, clearly thought out device with the highest electrical performance;
- The length of the capacitor body is 280 mm, and the diameter is 75 mm;
- The operating principle is based on automation, which will provide charging with a normalized current and protect the acoustics from overvoltage;
- The Brax capacitor operates at 17.5 V, if connected incorrectly, automatically connected to the power network and disconnected;
- Provides continuous indication of voltage at the amplifier terminals (see);
- The capacitor is made in a stylish, beautiful case with a transparent head, in the center of which a 3-charge digital indicator is displayed. This indicator becomes active as soon as it senses the slightest voltage ripple on the amplifier and shows a voltage of up to 0.1 V;
- The capacitor readings are not carried out by continuous blinking, as on some cheap models, but are averaged with a time constant of about 1.5 s;
- For rapid fluctuations, the answer is another indicator, operating on 2 LEDs. If one of them or two blinks at once, this indicates short-term voltage ripples;
- There is also a third indicator called CPS. It is needed to report danger: if it lights up red, the polarity is reversed; if it lights up yellow, the overvoltage protection has tripped.
Installation and charging
Thus, we explained why this component is needed in a car. Now let's move on to the useful topic of how to install and connect a capacitor.
Installation
The installation process itself has the following features:
- The capacitor is installed no further than half a meter from the amplifier to avoid a decrease in the amplitude of the current due to the resistance of the connecting wires;
- In no case should you skimp on a capacitor, and if you decide to install it, it must be a high-quality one, and not some Chinese one, so that it will be of any use.
- If there is still no electronic circuit in the capacitor, then it is recommended to initially recharge the element with a 12-volt light bulb;
- Interestingly, you can install a capacitor in a system of any power, regardless of the number of amplifiers.
Charger
As for charging the capacitor (see), as mentioned above, it is useful to charge with a 12 V light bulb, which will let the user understand how the process proceeds. It itself implies the following:
- A light bulb or resistor (preferably a 12 V light bulb) is connected to the battery positive on the wire;
- The other end of the wire is connected to the positive terminal of the capacitor;
- During the charging process, if the capacitor has a display with a light indication, it will light up. The voltmeter value on the capacitor will also increase, but as soon as it stops, charging must also be completed;
- Remove the light bulb or resistor.
How to choose and install a car capacitor?
In this publication, we will touch on all the nuances of choosing a car capacitor and methods for its correct installation. We will also not ignore its structure and the reasons why it may fail.
What is a capacitor used for?
A car audio system, which includes a separate amplifier and a powerful subwoofer, can draw very high current from the battery. The amount of current is so enormous that special thick wires are used to properly connect the amplifier. Sometimes the thickness of such a wire is greater than a human little finger. To provide a power supply system that can accumulate an electric charge of power for a long time, and release it at lightning speed at the right time, a subwoofer capacitor is used. I install this radio-electronic component to help the battery transfer current to the load very quickly. The capacitor helps especially strongly at peak moments in the reproduction of the most powerful low-frequency sections of musical compositions. The capacitor is also an excellent impulse noise filter. It reduces the noise level that inevitably occurs when starting powerful consumers in your car. An electrolytic capacitor for cars is an integral part of a complete car audio system with a subwoofer.
Additional benefits
Connecting a capacitor will bring a number of additional bonuses:
- filtering of high-frequency components of mains voltage, which has a positive effect on the operation of electrical systems and vehicle devices;
- preventing sudden voltage surges when the on-board electrical equipment is turned on reduces the overall load on the network and promotes smoother battery operation;
- assistance in starting the car using a starter, which is especially important in cold weather.
The main advantage of installing the device will be the normalization of low frequency reproduction, clear sound without interference or distortion.
Correctly setting up a subwoofer in a car
What is a subwoofer capacitor for?
The subwoofer is presented in the form of a complex system that consists of different elements. Capacitors are especially important. They are also called accumulators. They act as a filter and were previously installed only on expensive devices. Today they can also be found on budget options.
The capacitor on the subwoofer provides charge storage. It is transmitted to the amplifier, which leads to improved sound quality of the audio system. After the discharge is transmitted, the capacitor returns to its original discharged state. This way it is ready to accept the new bass. Moreover, this procedure takes place in a fraction of a second. A person cannot notice it, but he will immediately notice changes in sound for the better.
Many people have a question: is a capacitor needed for a subwoofer? The answer is simple. Yes. The presence of a capacitor on the subwoofer prevents the device from producing indistinct muttering. The latter is formed as a result of a voltage dip. This applies even to cheap music devices. As a result, the musical composition is reproduced cleanly and without extraneous noise.
