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The frequency response is characterized by the magnitude, typically in decibels (dB) or as a generic amplitude of the dependent variable, and the phase, in radians or degrees, measured against frequency, in radian/s, Hertz (Hz) or as a fraction of the sampling frequency.
The chief electrical characteristic of a dynamic loudspeaker 's driver is its electrical impedance as a function of frequency. It can be visualized by plotting it as a graph, called the impedance curve.
While the very best modern speakers can produce a frequency response flat to ±1 dB from 40 Hz to 20 kHz in anechoic conditions, measurements at 2 m in a real listening room are generally considered good if they are within ±12 dB.
A tweeter or treble speaker is a special type of loudspeaker (usually dome, inverse dome or horn-type) that is designed to produce high audio frequencies, typically deliver high frequencies up to 100 kHz.
exemplary frequency response (both in amplitude and phase) [citation needed] because the principle of generating force and pressure is almost free from resonances unlike the more common electrodynamic driver.
Frequency range and frequency response. The frequency response specification of a speaker describes the range of frequencies or musical tones a speaker can reproduce, measured in hertz (Hz). The typical frequency range for a subwoofer is between 20–200 Hz.