Tape recorder, amplifier, equalizer, tuner/radio, compact disc player, VCD player, laser disc player, kabel audio, microphone, pesawat telepon, pesaat televisi, diskette, alat-alat potret, alat-alat optik, mesin-mesin bicara, kas register, pesawat video, antena parabola, booster, ballast, trafo, disk optik, bel pintu listrik, mesin teleks, audio mixer, propesional power amplifier, sound processor (compressor limiter, active crossover, propesional equalizer, echo delay), propesional speaker system (untuk band, untuk lapangan, untuk studio)