The cases are classified as different types of orders, and orders. This overview will explain each model and provides links to calculators and references. While researching this I found some conflicting information. The data are less common ideas / theories out. I recommend you also search for anyone wishing to build their own houses. It is recommended amounts of user manual, you can usually get a fairly wide range between the minimum and maximum value. At times close to 1 cubic foot gap. These recommendations, in my opinion, are common for the first time buyer / builder. For more detailed levels, using a calculator or a program design required Theile-Small parameters (T / S parameters) as Q, F3, QES, QTc interval, FS, and or Xmax. These parameters, when using the box to give you a much more precise, or the gate length designed specifically for the driver.
The first order, also called an infinite baffle is basically a free air installation. Very few caraudio speakers are designed for this application, as most require some strength to prevent a trip. Note that some infinite baffle enclosure called closed so that this is due to the fact that the caraudio speakers are the most external mounted above the cab of a vehicle with its back against the trunk. In this case, the strain used as a sealed box. The airspace has little or no resistance or power on the caraudio speaker. Infinite baffle configurations have little or no tuning or adjustment.
The second order, or a sealed box, is one of the simplest models. Size and shape of the sealed boxes are the least complex to build, and is easy to achieve expected results. There are two types of sealed boxes. Infinite plate is higher than the sky with mechanical suspension of the woofer. In other words, you can use its own mechanical suspension excursion subwoofer and steering, which was the first time in the order. The second type is an air suspension system. Air suspension is lower than the Sky with suspension woofer. This type of container, the air cushion is used to prevent the caraudio speaker touched bottom. The following information is based on a suspension fences. Vans for the fast, tight, precise and controlled response. You can modify the driver performance by varying the size or the number of housing meets the material you use.
Disadvantages of closed cases for the low-frequency output is small in size, have less power, less than the SPL features, and you need a driver with a large Xmax ensure the safe use of the spectrum up to fB (case of resonance ).
The third order, or transferred back to the boxes and take advantage of wave process, in which case the extension is the most cost down lower mid-bass SPL octave or more regions, including the port tuned. And 'generally increases 3dB of output compared to the sealed container. Ported boxes give a deep, powerful, full-bodied sound when designed properly. Xmax is reached in less than a channel, subsonic filter is recommended.
Fourth Order boxes also known as dual-chamber (portage / sealed) is a combination of second and third order. Fourth control boxes or bandpass have a driver in a closed cabinet with a box worn on the front. The driver can be installed in both directions, so one side is sealed and ventilated seconds. Very low F3 is possible with a bandwidth of fourth-order boxes, and generally less driver excursion. There is more control over the movement of the cone, so overexcursion is less likely. Weigh the disadvantages of bandpass boxes, though. The total volume of the two chambers resulting in a large cabinet, which is difficult to design correctly. Drivers can be blown due to the conical movement leads to lower thermal limits are exceeded. In some larger vehicles (SUVs, vans) gain cabin accommodates minor calculation errors in giving a bandwidth of a flat box and bandwidth while maintaining an SPL increased.
Subscribe to the cells are transferred to the sixth of bandwidth on both sides of the driver. These cases are more effective bandwidth, and produces less audible distortion, while the ventricles are filters to remove unwanted noise. They are usually larger than the fourth-order boxes of bandwidth, and is much more difficult to plan properly. It has not been publicly released a precise formulas for calculating sixth order band boxes, calculators, and even the design of the programs are still experimental period. Like all full-range enclosure, home audio solution affects the total, so experimentation is necessary to find the right sound in your car.
Order eighth cases are much more complex and almost impossible to design. They consist of a bandwidth sixth order with the ports, as well as providing the third department in a confined space, which is also transferred. Eighth to nearly a sixth of the basic design is a gateway to the order of two separate rooms on the contrary, the third in a confined space.
All other commands are variants of the theory of band pass. There are some that do not fall into a category of the order. These are transmission lines, folded horn, longer useful low (EBS) and a passive radiator, there is also a setting called isobaric I will explain.
The design of the transmission line is a pilot enclosure mounted on a kind of labyrinth that serves as an acoustic low pass filter with a lag of 90 degrees, which absorbs all the energy of the wave of the driver's back, except for all frequencies below 75 Hz. The transmission line is almost always full of a certain type or different types of filler or filler material to reduce the speed of sound through the line of the shortest line length. The filling also dampens standing waves and reflections backwave. The length of the transmission line is usually between 4-8 feet. Length corresponds to the ¼ wavelength of the resonant frequency of the driver. For example, a 50 Hz has a wavelength, "which gives an estimated line length of 5.75 '23. Enclosures transmission line are for the serious audiophile with a lot of time and patience, even more seeking superior performance.
A folded horn is similar to a transmission line with a bandwidth of the base of the fourth order. A conductor encased in a sealed box with a transmission line instead of a port. The calculations are the same volumes of each side must be in sync with others.
Extended low shelves, or BSE for short is just a variant of broken routes. The idea is to design a cabinet to 125% -150% larger than the optimal amount calculated and set lower than normal. The result is an output gain of 2 dB FS (resonance to drive the air) provides a frequency response in the teenage years! An increase in efficiency below 25 Hz and 30 Hz down. The cut may be as high as 36dB/octave below fB. Transient response is degraded thereafter. The low of BSE is very soft and very deep. Recommended more for home theaters instead of car audio applications.
Passive radiators are used in combination with a device driver and is intended to replace the vent port or a third-rate caraudio speaker. The resonant frequency of RA is intentionally altered by the designer by adding or removing the amount calculated from the mass of the cone or the radiator. The passive radiator is essentially a caraudio speaker without coil, using a magnet for resistance or simply a cone to stand around. Using the flow of air in a sealed box by the driver, a passive radiator moves 180 degrees out of phase, if there is no resistance or channel in the camera. To further aggravate the heater resistance changes, thereby changing the frequency of the box.
Isobar double or drivers can be used with any piece of furniture. There are several ways to create an isobaric configuration. The first is to place them in the same airspace, and set one of 180 degrees out of phase drivers. Another is to assemble them in a pen with an air space between them, in this configuration, the first driver drives in a box where the other stands. The third and most common configuration is to mount isobars face to face with a small air space, but enough so they do not touch each other, and thread 180 degrees out of phase. The idea behind this is that one driver then pushes the other pulls, light load on each caraudio speaker. Benefits of the improved bass response. Low said to be tighter, faster and more accurate. Go to the conductor is reduced by half, and the amount of the cupboard.
Isobaaristen boxes are used when the whole is more specific question, or if the bass is more important than a lot of bass. The disadvantages are wasted amplifier power and efficiency is decreased by 3 dB compared to that of a driver.
Most of the information contained in this article come from protected sources and should be recognized as such. The following links provide more information and according to my repetition of the subject. The first link below is where I got most of the information for this article
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