The numerical value of woofer in Chaldean numerology is: 8 Good woofer design requires the efficient conversion of a low-frequency amplifier signal into mechanical air movement with high fidelity and acceptable efficiency, and is both aided and complicated by the need to use a speaker to couple cone movement to air. When done right, many other woofer design issues (such as linear deviation requirements) are reduced. PA system woofers usually have high efficiency and high power management. The trade-off for high efficiency at a reasonable cost is usually relatively low trigger capability (i.e. inability to get in and out” as far as many domestic woofers because they are intended for horns or large reflex cabinets. They are also generally ill-suited for prolonged bass response, as the last octave of the low-frequency response greatly increases size and cost, and it is increasingly uncost-effective to attempt high levels as in a PA app. A home stereo woofer, since it is used at relatively low volumes, may be able to handle very low frequencies. For this reason, most PA woofers are not well suited for use in high-end high-fidelity home applications and vice versa. The Charge 5 pushes 30 watts to the woofers and 10 to the tweeter and emits a response of 65Hz 20k. When combined with a library speaker system, subwoofers almost always extend the system`s frequency range downwards, relieving stressed shelf speaker woofers of the production load of all bass tones.
There are many challenges in the design and manufacture of woofers. Most have to do with controlling the movement of the cone, so that the electrical signal to the woofer`s vocal coil is faithfully reproduced by the sound waves generated by the movement of the cone. Problems include clean attenuation of the cone without audible distortion so that it stops moving, causing a ringing when the instantaneous input signal drops to zero with each cycle, and handling high arrows (usually needed to reproduce loud noise) with low distortion. There are also challenges to present the amplifier with an electrical impedance that is not too constant at all frequencies. There are three types of power management in speakers, including woofers: thermal (heat), electric (both discussed above), and mechanical. The mechanical load limit is reached when the cone deviation reaches the maximum limit. Thermal load resistance limits can be reached if relatively high power levels are supplied to a woofer for too long, even if mechanical limit values are never exceeded. Most of the energy applied to the vocal coil is converted into heat, not sound. All heat is finally transferred to the polar part, the rest of the magnetic structure and the frame. From the structure of the woofer, heat is finally released into the ambient air. Some pilots include better cooling precautions (e.g., ventilated magnetic polar parts, dedicated thermally conductive structures) to reduce the increase in coil/magnet/frame temperatures during operation, especially at high power levels. If too much power is applied to the voice coil compared to its ability to emit heat, it will eventually exceed a maximum safe temperature.
Adhesives may melt, the vocal coil former may melt or deform, or the insulation separating the vocal coil windings may deteriorate. Any of these events will damage the woofer, perhaps beyond ease of use. All cone materials have advantages and disadvantages. The three main characteristics sought by designers in cones are lightness, rigidity and lack of coloration (due to the absence of ringing). Exotic materials such as Kevlar and magnesium are lightweight and rigid, but can have ringing issues depending on their workmanship and design. Materials such as paper (including coated paper cones) and various polymers generally sound less than metal membranes, but can be heavier and less rigid. Good and bad woofers were made with all types of conical materials. Almost all types of materials were used for the cones, fiberglass, bamboo fiber, expanded aluminum honeycomb sandwiches and plastic cones loaded with mica. Library speaker woofers aren`t much bigger than that, and they have to worry about the average frequency next to the bottom end. A bass or bass speaker is a technical term for a speaker designed to produce low-frequency sounds, typically from 50 Hz to 1000 Hz. The name comes from the English onomatopoeic word for dog barking, “woof” (as opposed to the name of speakers for the reproduction of high-frequency sounds, tweeters). The most common design for a woofer is the electrodynamic speaker, which typically uses a rigid paper cone driven by a vocal coil surrounded by a magnetic field.
In most cases, the woofer and its cabinet should be designed to work together. As a rule, the cabinet is designed to match the characteristics of the speaker(s) used. The size of the cabinet is a function of the wavelengths that take longer to reproduce (lowest frequencies), and the woofer cabinet is much larger than necessary for medium and high frequencies. As electronics costs fell, it became common to have sensor-equipped woofers in inexpensive “music systems,” boomboxes, or even car stereo systems. This is usually done in order to get better performance from inexpensive or undersized drivers in lightweight or poorly designed packages. This approach presents difficulties because not all distortion can be eliminated with servo techniques and a poorly designed housing can flood the benefits of any attempt at electronic correction. At normal sound pressure levels, most people can hear up to about 20 Hz. In order to accurately reproduce the lowest sounds, a woofer or group of woofers must move a corresponding volume of air – a task that becomes more difficult at low frequencies. The larger the room, the more the air must move the movement of the woofer in order to produce the sound power required at low frequencies. In 1965, Sennheiser Electronics introduced the Philharmonic Sound System, which used electronics to overcome some of the problems of traditional woofer subsystems.
They added a motion sensor to the woofer and used the signal that matches its actual motion as a control input for a specially designed amplifier. If done carefully, it can significantly improve performance (both in terms of sealing and low-frequency power expansion), at the expense of flexibility (the amplifier and speaker are permanently connected) and cost. In the United States, L W Erath, an engineer for the oil industry, introduced a series of high-end speakers that went in the same direction.