peralatan pengolahan data dan komputer, tape recorder, amplifier, speaker, equalizer, tuner/radio, compact disc player, VCD player, DVD player, laser disc player, kabel audio,' microphone, pesawat telepon, antena parabola, booster, ballast, trafo, disk optik, bel pintu listrik, audio mixer, professional power amplifier, sound processor (compressor limiter, active crossover, professional equalizer, echo, delay), professional speaker system (untuk band, untuk lapangan, untuk studio)