Make loudspeaker damper spider suspension cloth
A mid-range speaker is a loudspeaker driver that reproduces sound in the frequency range from to Hz. It is also known as a squawker. Mid-range drivers are usually cone types or, less commonly, dome types, or compression horn drivers. The radiating diaphragm of a cone mid-range unit is a truncated cone, with a voice coil attached at the neck, along with the spider portion of the suspension, and with the cone surround at the wide end.
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Acoustics/Acoustic Loudspeaker
Much more information is available in the manuals. T he word "speaker" is the shortened form of the word "loudspeaker" and it refers to a device that converts electrical signals into sound waves that we can hear.
A speaker has several parts: Box — houses the drivers and, if present, a passive crossover network. Crossover network — divides the audio signal between the drivers. Driver — converts the electrical audio signals into sound waves. Sometimes people refer to the drivers as speakers. Yet, the speaker is really the entire system, including box, crossover network if present and drivers.
Drivers There are many different kinds of drivers but they all do basically the same thing: create sound waves. By far the most common type of driver is the moving coil electrodynamic piston driver.
It has a moving part called a diaphragm that acts like a piston to pump air and thereby create sound waves. A common diaphragm for a woofer is a paper cone. A common diaphragm for a tweeter is a fabric dome.
Why do drivers come in so many different sizes? Because it is nearly impossible to make one piston driver that can reproduce sound waves over the entire 20 Hz to 20 kHz frequency range of human hearing.
To produce low frequencies a driver needs to have a large diaphragm and enough mass to resonate at a low frequency. To produce high frequencies a driver needs to have a small diaphragm with a low mass. Obviously, these requirements are in opposition so drivers are usually designed to produce only a portion of the sound.
This gives rise to multi-way speaker systems like the two-way system shown above. It uses a tweeter for the high frequencies and a woofer for the low frequencies. Besides their different size, there is another very significant difference between a tweeter and a woofer.
The tweeter usually has a sealed back while the woofer usually has an open back. With a sealed back, the tweeter emits sound waves from the front side only. A woofer emits sound waves from both its front and back side. Tweeters are the smaller drivers since they produce the highest frequencies with the shortest wavelengths. Woofers are the largest drivers since they produce the lowest frequencies with the longest wavelengths. Are there other driver sizes? Yes, there are also midrange drivers of various sizes that reproduce middle frequencies between the tweeter and woofer.
Midrange drivers are used in multi-way speakers with three or more driver sizes. Some have open backs and some have sealed backs. They are organized below according to their function. Crossover Network Most speakers must use more than one size driver because it is extremely difficult for one driver to accurately reproduce sound waves over the entire 20 Hz to 20 kHz frequency range of human hearing. The most common multi-way speakers use two drivers, a tweeter and a woofer.
This requires the electrical audio signal to be divided into a high-frequency part and a low-frequency part before the signals reach the drivers. This is very important because most tweeters will be damaged if they are driven with a low-frequency signal. The illustration below shows the sound being divided between the tweeter and the woofer: The job of the crossover network is to divide the audio signal.
For this reason, crossover networks are sometimes called "dividing networks". The frequency where the sound is divided is called the "crossover frequency". Ideally, a crossover frequency is chosen which protects the tweeter, allowing it to produce only those frequencies that it can reproduce the best, and allows both the response and coverage pattern of the woofer to blend well with the tweeter.
Note: The "coverage pattern" is the shape of the listening area where a driver will provide a relatively uniform direct sound pressure level. If the speaker has more than two size drivers the crossover network would also divide the audio signal into one or more additional midrange frequency bands. There are two places where a crossover network can be placed in the audio system: after the amplifier or before the amplifier. Here are some points about each location:.
In this topic, the important point to remember about crossover networks is that they divide the audio signal so that each driver in a multi-way speaker will receive only frequencies that it can handle and reproduce well.
Box At first glance, it is obvious that the speaker box provides a place to mount the drivers. But is this the primary purpose of the box? The answer might be "yes" for tweeters because they have sealed backs and are not affected by the compliance of the air inside the box or, if present, the resonance of the box. Note: "Compliance" is springiness or mushiness. It describes how easily something can be compressed. A large volume of air is more mushy or compliant than a small volume of air.
A bell resonates because it continues to make a sound long after it has been struck. Normally, a closed box should not resonate.
However, boxes with vents or passive radiators are designed to resonate. The answer to the preceding question is definitely "no" for drivers with open backs like woofers.
A box provides two very important functions for an open back driver:. Making a Driver Work Efficiently In many ways the diaphragm of a speaker driver is very similar to the piston of a car engine. In the car engine, the piston needs a cylinder so it can create pressure. This is illustrated below: The piston in the engine moves up and down inside the cylinder. As it moves upward, it compresses a mixture of gasoline and air so that they will create a powerful explosion when the pressurized mixture is ignited by the spark plug.
As the engine gets older the piston and cylinder wear and the seal between them begins to leak. When this happens, the cylinder loses pressure because the mixture of gasoline and air can leak past the piston.
This causes the engine to lose power. In other words, it loses its ability to work efficiently. In similar fashion, the diaphragm of a speaker driver, needs to compress air so that it can create sound waves. But if the diaphragm of an open-back driver like a woofer is not sealed, the air can slip past it, reducing its ability to compress the air to create sound waves.
So it is very important to seal the back side of the diaphragm with a box. Notice above that the woofer emits sound waves on both sides of the diaphragm. When the sound waves on the front are positive the cone moves outward , the sound waves on the back will be negative or inverted. This need to isolate sound waves between the front and back of an open-back driver does not exist at all frequencies. It occurs only for lower frequencies whose wavelength is relatively large when compared to the piston diameter of the diaphragm.
Because the diaphragm becomes directional as the wavelengths become shorter and so the sound will naturally not mix between the front and back even when the driver is in open air. This is why a driver in open air lacks bass or sounds "thin". It produces mid and high frequencies without the rear sound waves canceling the front ones. But the low frequencies are diminished or cancelled. Since the greatest effect of the box is to control the low-frequency response of open-back drivers, this is the focus of box design, including our box design software BassBox Pro and BassBox Lite.
And this leads us directly to the second function of the box:. Shaping the Low-Frequency Response Enclosing the back side of an open-back driver in a box does more than just prevent the rear low-frequency sound waves from mixing with and canceling the front.
The box also has a strong influence on the quality of the sound. The graph below shows the amplitude response of three different boxes, each with the same model driver.
The green curve is considered by many speaker designers to be ideal. This is because the response is "maximally flat", meaning that the response stays level for as long as it can before dropping off. The reason why a "flat" response is considered the best is because it allows the speaker to produce sound waves that more closely match those of the original audio signal.
This is what "high fidelity" is all about. Of course, there are times when you do not want a flat response. For example, an electric guitar speaker is used to create sound—not reproduce sound—so a non-flat response may be desired in order to give the guitar a desired sound quality. The red curve was created by putting the same driver in a box that was over times bigger than the maximally flat box. In fact, the box was so big that it makes the driver behave as if it were mounted in a really huge wall.
Speaker designers call this an "infinite baffle" design. While the use of such a large box extends the low-frequency response, it does so at the expense of loudness because the level begins to decrease much earlier than the maximally flat box.
Plus, it will force the driver's diaphragm to move farther which will reduce the maximum power it can handle. The blue curve was created by putting the same driver in a box that was about 25 times smaller than the maximally flat box. Such a small box has a very dramatic effect. It created a 9 dB response peak and caused the response to drop off very early.
The large peak indicates that the speaker will have a large resonance. This means that the box will "ring" like a bell at frequencies within the peak. This will make the speaker sound louder at those frequencies but it will do so at the expense of transient response because any sudden sounds like the beat of a drum will no longer sound as distinct as they originally did.
There is a very good analogy that has been used by many to describe key characteristics of a driver. It is the analogy of the "weight and spring". This is illustrated below: In this analogy, the spring represents the suspension of the driver its surround and spider. The driver suspension acts like a spring to pull the piston back to the center whenever it is pushed or pulled by the motor the voice coil and components of the magnet circuit.
Damper / Spider / Suspension
Mail 1 and my response:. Dear Mr. Gravesen, I read with great interest your WharfedaleSuper8. The green felt is the wrong thickness and it never had an aluminium dome. The foam on the treble cone is essential and IIRC, the surround should be foam too. However, the cloth surround, the cones but not the aluminium dome are all parts that have been used in other Wharfedale speakers so my guess is that your units have been repaired by a well meaning Wharfedale agent who could no longer get proper parts. They even forgot to seal the surround.
Car Speaker Anatomy: Factors That Influence Sound Quality
A loudspeaker that incorporates features for improvements in performance, and quality while reducing component and manufacturing costs. One embodiment details a plastic frame with integrally molded spider. Another embodiment details a spider molded with individual legs that provides better control of the restorative force characteristic. The spider may also incorporate more than one plane of lateral stiffness to improve the loudspeakers tendency for voice coil rocking. An additional embodiment details a frame with generic mounting edge that mates with a secondary mounting flange that includes product specific requirements. The frame and mounting flange are separated by an outer section of the diaphragm suspension annulus that serves as vibration isolation. An additional outer section of the annulus can serve as a gasket to the mounting structure. The present invention comprises a loudspeaker transducer that incorporates components molded from resin that improve the performance and quality while reducing component and manufacturing costs.
Repair Adhesives
Year of fee payment : 4. Effective date : A linearly compliant, flexible, resilient and flat speaker damper connected between the frame and the cone of the speaker with electrically conductive paths applied to the damper to conduct the signal to be applied to the voice coil of the speaker. A method for linearly compliant audio speaker damping and a method for application of voice coil conductors on the damper. The present invention is related generally to audio speakers, and more specifically to an audio speaker damper connected between the frame and the cone of the speaker with an electrically conductive path on the damper for the voice coil audio signal, and a method therefore.
Speaker Cones — Fabrication, Materials, and Performance
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Ask Richard
Just like any other driver, you want to have enjoyable sound when you have to be behind the wheel. For this to happen, every feature of the stereo system must be top-notch — from the head unit and the amplifier to the speakers. Car speakers are the producers of sound and for many of us, what we hear is all what we care about. When you choose speakers properly, you are done with more than half of the journey toward better sound quality. There is a lot of information online on the best car speakers. If you want to know more about choosing specific types of speakers, Speaker Champion covers various types of car audio equipment.
Acoustics/Acoustic Loudspeaker
Available in three stylish finishes: gloss black, matte white, and red walnut. This double woofer design produces vibrant, accurate deep bass performance. Motion 40i delivers the classic broad soundstage of the Motion Series from a newly designed enclosure enhanced by the slightest of modifications, including the drive-stabilizing dust cap design, stiffened motor suspension, and low-mounted woofers to reduce an acoustically harmful phenomenon known as floor bounce. The speaker's enclosure sports a reinforced baffle and a fabric grille.
New Speaker Series. The philosophy of this project is to create a loudspeaker system with an extremely high transient response dynamic , in order to obtain a music reproduction with a more realistic impact and involvement. To achieve this, the main goal was to reduce the moving masses in order to make the mobile part of the loudspeaker light and fast in its movements, favoring the sudden variations of movement transmitted by the piece of music through the amplifier. A look inside - Tweeter and Midrange. This gives tighter tolerances and improved performance. The axial ventilation holes reduce the compression of the air at the back of the dome with greatly reduced distortion and extended response into lower frequencies.
Year of fee payment : 4. A damper speaker includes a fiber cloth woven by fibers, each of the fibers is formed by a single fiber strand or several fiber strands. The fiber strand includes a first fiber, which is one or a combination of cotton, polyester and aramid fiber. The speaker damper includes a layer of resin, which is absorbed by and combined with the fiber cloth. The fiber cloth is then cut into a predetermined shape through a molding means. Field of the Invention. The present invention relates to a vibrating structure of speakers, more particularly, to a speaker damper and the manufacturing method thereof.
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