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30
Type-1A : La longueur de chemin jusqu’à la
position d’écoute est supposée à peu près
identique dans ce cas (2-3 m idéalement),
avec un positionnement dans laxe de tous
les amplificateurs. La liaison de phase est
accomplie par un filtre passe-haut 2
ème
or-
dre avec coefficient Q faible sur le tweeter,
un filtre passe-bas de 1
er
Ordre et un filtre
passe-haut de 4
ème
Ordre sur le haut-parleur
médial et un filtre passe-bas de semi-4
ème
Ordre sur le woofer. Les résultats sont des
points de croisement acoustiques de 3,8kHz
et 700Hz respectivement.
Type de système 1
10
0
10
20
30
40
50
20Hz 30Hz
100Hz
1.0KHz 3.0KHz 10KHz 30KHz300Hz
Réglage du cavalier du circuit
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
+
+
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.
32


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