Audio amplifiers and preamplifiers are units that amplify a sound signal, which is then sent to a speaker or another amplifier

Audio microphones are designed for sound reception and recording applications (speech and music).

Specialized audio equipment is used in specific industries such as the recording industry, and for specialized applications such as voice digitizing and analysis.

Charge converters and charge amplifiers convert the charge output from a piezoelectric, capacitive or other charge-producing sensor to a signal such as analog voltage or current.

RF headends are electronic control centers, generally located at the antenna site of a system, which includes the antenna, preamplifiers, frequency converters, demodulators and other related equipment

Antennas are structures or devices used to collect or radiate electromagnetic waves.

Measurement microphones are most commonly condenser microphones, which convert sound pressure to an output that is then converted into a reading such as sound pressure level (SPL).