Frekvenčný rozsah reproduktora (reprosústavy)

GlossarySpeakersFrekvenčný rozsah reproduktora (reprosústavy)

Hoci sa to môže zdať ťažko uveriteľné, parameter frekvenčného rozsahu nevypovedá pri väčšine bežne dostupných reproduktorov takmer o ničom. Aby ste pochopili, prečo to tak je, budete musieť „prekusnúť“ trochu teórie.

Frekvenčný rozsah udáva, aké kmitočty je reproduktor schopný prehrať. Trik je však v tom, že pri väčšine lacných a prenosných reproduktorov výrobcovia neudávajú, pri akom útlme reproduktor dosahuje frekvenčný rozsah. Ak teda pri frekvenčnom rozsahu nie je udaný útlm (štandardne -3 dB alebo -6 dB), môže tam výrobca napísať „beztrestne“ takmer akúkoľvek hodnotu.

Štandardne sa frekvenčný rozsah udáva pri meraní v nízkoodrazovom priestore. Niektorí výrobcovia ho však udávajú pri reálnych posluchových podmienkach v miestnosti, čo opäť rozširuje odozvu smerom k hlbším basom. Názorne vám popíšeme meranie frekvenčnej odozvy regálového hifi reproduktora Monitor Audio MA7.

Na obrázku je zreteľné, že reprodukcia zo stredobasového meniča výrazne slabne už od cca 85 Hz a basy vo frekvenčnom rozsahu 35 – 85 Hz reprodukuje takmer výhradne basreflex. Frekvenčný rozsah reproduktora Monitor Audio MA7 by sme mohli opísať približne takto:

85 – 16 000 Hz (-3 dB)
60 – 17 000 Hz (-6 dB)
40 – 18 000 Hz (-10 dB)
30 – 20 000 Hz (-20 dB)

Z uvedeného popisu je zrejmé, že ak výrobca pri frekvenčnom rozsahu neudáva aj zodpovedajúcu hodnotu útlmu (hodnota v zátvorke), pri ktorej frekvenčný rozsah nameral, môže vám beztrestne „podstrčiť“ takmer akúkoľvek hodnotu.

Naša ponuka reproduktorov

Slovník pojmov

Slovník pojmov – Dynamický rozsah hudby
Slovník pojmov – Citlivosť reprosústav SPL (dB/W/m)
Slovník pojmov – Akustický tlak (akustický výkon)
Slovník pojmov – Pásma reproduktora (reprosústavy)
Slovník pojmov – Maximálny dlhodobý príkon reproduktora (RMS)

P-DC1-WEB18

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