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Italiano 35
L
R
L
R
L
C
C
23 4
Tri-mode
UNITÀ
CENTRALE
(Filtro passa
alto)
Subwoofer
(L + R) (Parallelo)
Principi del modo Tri-mode
Metodo per la divisione della banda di frequenze utilizzando una bobina ed un
condensatore … nel caso di 6dB/pendenza ott.
L
C
0 dB
-3 dB
Bobina (L): Lascia passare le basse frequenze e blocca
quelle alte (filtro passa basso).
Condensatore (C): Lascia passare le alte frequenze e
blocca quelle basse (filtro passa alto)
Frequenza di crossover
Frequenza
159000
C= (µF)
fc x R
159 x R
L= (mH)
fc
fc=Frequenza di crossover (Hz)
R=Impedanza dei diffusori ()
Esempio:
Quando è necessario impostare una frequenza di crossover di 120 Hz utilizzando diffusori
con un’impedenza di 4 ohm.
Preparare una bobina ed un condensatore con i valori nominali il più prossimi ai risultati calcolati
con la formula sopraindicata. Il valore nominale del condensatore deve essere il più prossimo
possibile a 331,25 (µF) mentre quello della bobina deve essere il più prossimo possibile a 5,3
(mH).
Se si vuole collegare in ponte un altoparlante, l’impedenza dell’altoparlante non dovrà essere
inferiore a 4 ohm. L’uso di diffusori di impedenza inferiore ai 4 ohm può danneggiare l’unità.
Assicuratevi di collegare i condensatori agli altoparlanti a cui passeranno le alte frequenze.
Altrimenti si verificherà una caduta dell’impedenza combinata del subwoofer.
Assicuratevi che sia sufficiente la tensione e la corrente nominale dei condensatori (C) e delle
bobine (L).
2ATTENZIONE
KAC-7251/7201(E) 3Italian 02.11.14 10:28 AM Page 35
35


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