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Type-3B :
Malgré le fait que le haut-parleur
médial et le tweeter soient montés sur le
même plan et à proximité lun de lautre, leur
orientation fait que le centre acoustique du
haut-parleur médial est plus loin. Cest pour-
quoi il est considéré que le haut-parleur
médial est 8,5 cm plus loin que le tweeter,
tandis que le woofer est environ 25 cm plus
près que le haut-parleur médial.
Pour le point de croisement supérieur, un fil-
tre passe-haut de 3
ème
ordre avec coefficient
Q relativement bas est utilisé sur le tweeter
en combinaison avec un filtre passe-bas de
semi-1
er
ordre sur le haut-parleur médial.
Ensuite, pour la transition du haut-parleur
médial au woofer, un filtre passe-haut de 3
ème
ordre sur le haut-parleur médial sintègre
bien avec un filtre passe-bas de semi-2
ème
ordre sur le woofer. Ensemble, ces combi-
naisons de filtres génèrent des points de croi-
sement acoustique de 3,8kHz et 600Hz.
Réglage du cavalier du circuit
Remarques :
Les cavaliers de niveau du tweeter surlignés sont les réglages recommandés pour cha-
que configuration, mais il est possible de désirer un réglage utilisateur.
Les simulations de fonction de transfert illustrent uniquement leffet du filtre sur le signal
dentrée et ne représentent donc pas la véritable réponse de fréquence du système.
Si lon utilise des canaux damplification séparés (mode deux ou trois fils), les cavaliers de
liaison de signal appropriés doivent être retirés.
10
0
10
20
30
40
50
20Hz 30Hz
100Hz
1.0KHz 3.0KHz 10KHz 30KHz300Hz
HP-2
HP-1
LP-2
LP-1
+2dB
MID HP/LP
3dB
1.5dB
0dB/0
°
+1.5dB/15
°
+4dB/30
°
HP-1
HP-2
HP-3
BYPASS
BYPASS
LP-1
LP-2
LP-3
LP-BYPASS
HP-BYPASS
TW LEVEL
WF LP
MID HP/LP
WF/MID
SIGNAL LINK
SPXZ18T
TW HP
MID/TW
SIGNAL LINK
+
+
39


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