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