Ключевые слова: acoustics, adjusting knob, amplifier, analog, audio, audio electronics, black, box, button, cassette, cd, cdr, compact, control, device, digital, electrical, electronic, electronics, equipment, frequency, hifi, hifi amplifier, hifi unit, knob, loud, loudspeaker, media, metal, meter, modern, multimedia, music, musical, object, panel, perspective, play, player, power, radio, retro, silver, sound, speaker, stereo, studio, system, technology, tuner, volume,