Spectrum analyzers and signal analyzers display raw, unprocessed signal information such as voltage, power, period, wave shape, sidebands, and frequency.

Audio analyzers measure the noise and audio spectrum of output from an amplifier or a stereo

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

Digital delay generators are electronic test equipment that generates delays (pulses at precise, programmed intervals) to trigger devices under test.

Sound proofing and acoustic materials are used to attenuate, deaden, or control sound and noise levels from machinery and other sources for environmental amelioration and regulatory compliance.

Network modems (modulators-demodulators) are devices or programs that allow computers to transmit data over telephone lines.

Sound level meters and noise dosimeters are used in sound and noise analysis.