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Type de système 3
Type-3A :
Le haut-parleur médial et le
tweeter sont à la même distance et au même
angle tandis que le woofer est situé plus près
et assez en dehors de laxe de la position
d’écoute. Cest pourquoi le centre acousti-
que du woofer est considéré comme étant
lamplificateur le plus proche à environ 18,5
cm. Afin de minimiser le chevauchement tout
en maintenant la cohérence de phase entre
le haut-parleur médial et le woofer, un filtre
passe-haut de 3
ème
ordre et un filtre passe-
bas de semi-2
ème
ordre sont appliqués, ce qui
entraîne un point de croisement de 600 Hz.
Puisque le tweeter et le haut-parleur médial
sont plus loin, un retard minimal et un ré-
glage du niveau sont désirables, en utilisant
un filtre passe-haut de semi-2
ème
ordre à fai-
ble coefficient Q sur le tweeter et un filtre
passe-bas de 1
er
ordre sur le haut-parleur
médial pour obtenir un point de croisement
acoustique de 3,8KHz.
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
+
+
38


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