Speaker Box, Tape recorder, amplifier, speaker, equalizer, tuner/radio, compact disc player, VCD player, DVD player, laser disc player, kabel audio, microphone, pesawat telepon, pesawat televisi, pesawat computer, diskette, alat-alat potret, kas register, batu battery, pesawat video, antena parabola, boosterm ballast, trafo, disk optic, mesin teleks, audio mixer, professional power amplifier, sound processor (compressor limiter, active crossover, professional equalizer, echo, delay), professional speaker system (untuk band, untuk lapangan, untuk studio)