Zobel network

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(n.) A Zobel network is used in an audio amplifier to dampen high frequency oscillations that might occur in the absence of loads at high frequencies. The network limits the rising impedance of a loudspeaker due to the speaker coil inductance. It is also referred to as a Boucherot cell. Some loudspeaker crossover designs include Zobel networks wired across the high frequency driver to compensate for the rise in impedance at high frequencies due to the inductance of the voice coil. The goal is to try to keep the load seen by the crossover circuitry as resistive as possible.