Exploring Common DIY Terminology - Heat Sink

Heat Sink

Heat sinks are components or structures used to dissipate heat generated by the voice coil during operation. Loudspeaker drivers, particularly high-power drivers, can generate significant heat due to electrical resistance and mechanical losses. Heat sinks help to transfer this heat away from the voice coil and other sensitive components, preventing overheating and potential damage. The primary function of a heat sink is to increase the surface area available for heat dissipation....

Nominal Impedance

Nominal impedance is a manufacturer specification commonly used to describe the average or approximate electrical impedance of a loudspeaker or individual driver. It is usually represented by a single value, such as 4 ohms or 8 ohms. For consumer audio, the nominal impedance indicates the most difficult average load a loudspeaker presents to an amplifier under normal operating conditions and is used to match the speaker to the amplifier's output impedance. For designing...

Pe (Thiele/Small Parameter)

In loudspeaker design, "Pe" stands for thermal power handling. It is one of the Thiele/Small parameters used to specify a loudspeaker driver's ability to handle electrical power without experiencing thermal overload or damage. When an audio signal is applied to the loudspeaker's voice coil, electrical energy is converted into mechanical motion, generating sound. However, some of the electrical power is converted into heat due to resistive losses...

Surround

In the context of loudspeaker drivers, the surround, also known as the "speaker surround" or "suspension surround," is a component that plays an important role in the driver's suspension system. The surround is typically a flexible ring or membrane that connects the outer edge of the loudspeaker diaphragm (cone/dome) to the driver's frame (basket). The primary function of the surround is to provide a compliant and flexible suspension for the diaphragm, allowing...

AMT (Air Motion Transformer)

An AMT is a type of driver (often a tweeter) that is based on a principle called the “Heil Air Motion Transformer” developed by Dr. Oskar Heil in the 1970s. An AMT is constructed from a diaphragm - a thin structure made of a lightweight material such as polyester film or metal foil - driven by a magnet and voice coil assembly positioned around it. The diaphragm is typically pleated like an accordion or folded like a fan to increase its effective surface...

Qms (Thiele/Small Parameter)

Qms (Mechanical Q-factor) is a parameter used in loudspeaker design to quantify the mechanical losses within the driver's moving system, which includes the diaphragm, voice coil, and suspension components. It provides insights into the damping characteristics and mechanical performance of the driver. The following are areas that are directly impacted by Qms:

• Damping and transient response: Qms is an indicator of the mechanical damping within the driver.

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Distortion

Distortion refers to any unwanted alteration or modification of the original audio signal as it is reproduced by the loudspeaker. It manifests as changes in the waveform or frequency response of the reproduced sound, leading to a degradation in audio quality and accuracy. There are various causes of distortion in loudspeakers, including:

• Nonlinearities in Driver Response: Loudspeaker drivers, such as woofers, tweeters, or mid-range drivers, may exhibit nonlinear behavior

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Horn

A horn refers to a type of acoustic device used to improve the efficiency and directivity of sound reproduction. It is designed to efficiently couple the sound energy from a loudspeaker driver and effectively project it into the listening space. A horn can enhance the overall performance of a loudspeaker system by increasing sensitivity, controlling dispersion, and extending the low-frequency response. The primary function of a horn is to transform the relatively small diaphragm...

Power Compression

Power compression is a phenomenon that occurs when the voice coil and other components of a loudspeaker driver heat up due to increased power input. As the voice coil temperature rises, its resistance also increases, leading to a decrease in the electrical power converted into acoustic output. This reduction in acoustic output for a given electrical power input is known as power compression. The concept of power compression is essential to understand because it can...

Acoustic Phase

Acoustic phase is a concept used to describe the relationship in time between two or more sound waves at a specific point in space. It represents the relative timing or alignment of the crests and troughs of the sound waves as they propagate through the air. In simple terms, the phase of a sound wave indicates where it is in its cycle at a given moment. A sound wave is a repeating pattern of compressions (areas of higher pressure) and rarefactions (areas of lower pressure)...