Exploring Common DIY Terminology - Back Plate

Back Plate

The back plate (sometimes referred to as the bottom plate) is a stationary component of a driver’s motor assembly that works in conjunction with the voice coil and magnet to convert electrical signals into sound waves. Typically made from a ferromagnetic material (such as iron or steel), the back plate is mounted behind the voice coil and is usually a flat or slightly concave structure with a central opening through which the voice coil passes. The primary function of the...

Acoustic Lens

An acoustic lens refers to a device or structure designed to manipulate the direction, dispersion, or focusing of sound waves. The term is inspired by the concept of optical lenses used in optics to manipulate light. The primary purpose of an acoustic lens is to modify the propagation characteristics of sound waves, enabling control over their distribution and spatial behavior. Acoustic lenses can be implemented in various forms, including physical structures, signal processing...

Dome

A driver that utilizes a dome-shaped (convex) diaphragm is commonly referred to as a dome driver. This design is often used in tweeters and occasionally in midrange drivers. The dome diaphragm is typically made of materials like silk, fabric, or metal (aluminum, titanium, and beryllium are relatively common), and is attached to a voice coil at its center.

Advantages of Dome Drivers:

• Wide Dispersion: Dome drivers have the advantage of providing wide dispersion of

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Impedance

In loudspeaker design, impedance is a critical electrical characteristic that directly influences how a speaker interacts with amplifiers and affects the overall performance of the audio system. Impedance is a measure of the opposition to the flow of alternating current (AC) in an electrical circuit. It is represented in ohms (Ω) and varies with frequency in speaker systems. Impedance is essential for loudspeaker design because it influences several aspects:

• Driver Selection

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Power Handling

Power handling refers to the maximum amount of electrical power a loudspeaker can handle without suffering damage or performance degradation. It is a manufacturer specification that indicates the speaker's ability to handle different power levels and is typically measured in watts (W). The factors that determine power handling are varied:

• Voice Coil Size and Material: The size and material of the voice coil play a significant role in power handling. Larger voice coils

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Ferrite (Magnet)

In the context of loudspeaker driver design, a ferrite magnet refers to a type of permanent magnet commonly used in the motor assembly of loudspeaker drivers. The magnet plays a crucial role in generating the magnetic field necessary to interact with the voice coil, which, in turn, moves the diaphragm and produces sound. Ferrite magnets are made from a compound of iron oxide and other elements, such as strontium or barium. They are cost-effective, widely available,...

Breakup Modes

Breakup modes refer to the resonant behavior or vibrations that occur when the diaphragm or cone of a loudspeaker driver starts to deform and produce undesirable sound artifacts at certain frequencies. Such resonances can be caused by various factors including the inherent stiffness and mass of the diaphragm, its shape, and the material(s) used. Breakup modes typically manifest as peaks and dips in the frequency response of the driver, indicating that certain frequencies...

Beaming

Beaming refers to a phenomenon where the dispersion pattern of sound waves becomes narrower and more focused at higher frequencies. The primary cause of beaming is the physical size or dimensions of the sound source relative to the wavelength of the sound being produced. When the wavelength becomes comparable to or smaller than the size of the source, the sound waves tend to exhibit more directional behavior. Beaming occurs due to the following factors:

• Aperture effect: The

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Dual Voice Coil (DVC)

A dual voice coil (DVC) design is a configuration commonly used in loudspeaker drivers, particularly subwoofers. It involves a speaker driver with two separate voice coils wound on a shared former (the cylindrical structure that holds the voice coils), each connected to its own set of terminals. Each voice coil is wound with its own wire, and they are physically separated but located on the same former. The former is connected to the speaker cone, which moves in...

Inductance

Inductance is an essential electrical property that arises in conductors and coils due to the presence of magnetic fields. It is one of the key elements in electrical circuits, along with resistance and capacitance, and plays a significant role in various electronic and electromechanical systems, including loudspeakers.

Definition and Symbol: Inductance, denoted by the symbol "L," is a measure of an electrical component's ability to store energy in...