Although the NS-F51 has 3 speakers, it still belongs to the 2-band type of acoustics. Two low-frequency speakers with a diameter of 16 cm (6.5”) each transmit smooth sound (without dips) over a wide range, and a standard tweeter tweeter (Ø 3 cm) complements the frequency spectrum in a high register. It is this type of speaker system device that provides sound from 43 to 26,000 Hz. It is worth noting the presence of magnetic protection, which allows you to install the speaker in close proximity to other types of equipment (televisions, amplifiers, etc.)