Q:

What is considered a "normal" range for amplifiers?

A:

Quick Answer

Amplifiers operate over a frequency range that is normally between 20 and 20,000 hertz, according to Joe Roberts, a former U.S. Navy electronics engineer. Common power ratings for amplifiers range between 20 watts per output channel and 1000 watts per output channel, notes Audio Publishers Group.

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Full Answer

Amplifiers are rated in terms of watts per channel at several different load impedances measured in ohms, according to Joe Roberts. The most common load impedances are 2, 4 and 8 ohms, although 4-, 8-, 16- and 32-ohm impedances are more likely with older vacuum tube amplifiers. Lower impedances create more difficult loads for amplifiers to drive. Some manufacturers include a specific amount of harmonic distortion in ratings.

Amplifiers of 250 watts or greater typically have a dynamic range of 110 to 120 decibels, notes ESR Acoustics. Car audio amplifiers may have from one to eight output channels as of 2015, according to Audio Publishers Group.

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