Purchased at Edion in August 2025. The experience is that background noise disappears, vocals come forward, and the sense of depth between the vocals and accompaniment changes. A real sound processor is an audio accessory that improves the sound quality of speakers by correcting harmful impedance fluctuations that occur between the amplifier and speakers, and by absorbing back electromotive force. It is connected to the speaker's input terminals using speaker cables, and if bi-wiring is supported, it is connected to the input terminals for mid and high frequencies.