aktif crossover, alat alat potret, alat-alat optic, amplifier, antena parabola, audio mixer, batu baterai, bel pintu listrik, booster, ballast, compact disk player, delay), disk optic, disket, DVD player, echo, equalizer, kabel audio, kas register, lampu proyeksi, lampu putar/sirine, laser disk player, mesin telex, mesin-mesin bicara, microphone, pesawat penggerak otomatis, pesawat telepon, pesawat televise, pesawat video, player, profesional equalizer, profesional power amplifier, profesional speaker sistem (untuk band, lapangan, untuk studio), sound prosessor (compressor limiter, speaker, stop kontak untuk lampu listrik, tape recorder, trafo, tuner/ radio, VCD