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14
En 1988, Yamaha a lancé sur le marché des enceintes
dotées du YST (Yamaha Active Servo Technology), un
système assurant une restitution puissante et de haute
qualité dans les basses fréquences. Utilisant une liaison
directe entre l’amplificateur et l’enceinte, cette technologie
garantit une transmission fidèle du signal et une commande
précise des enceintes.
Les haut-parleurs étant pilotés par les circuits de
commande par impédance négative de l’amplificateur et
par la résonance générée entre le volume de l’enceinte et le
port, l’énergie résonante produite (concept “boumeur à
air”) est supérieure à celle des enceintes bass-reflex
standard. Ceci permet à des enceintes de taille bien plus
petite de restituer des basses fréquences.
Le nouveau système Advanced YST II de Yamaha ajoute
de nombreux perfectionnements à la technologie YST
(Yamaha Active Servo Technology) en permettant un
meilleur contrôle des forces commandant l’amplificateur
et l’enceinte. Sur le plan de l’amplificateur, l’impédance de
l’enceinte varie en fonction de la fréquence du son. Les
nouveaux circuits Yamaha, qui associent une commande
par impédance négative à un pilotage à courant constant,
offre une plus grande stabilité des performances et une
restitution nette des basses fréquences sans aucune opacité.
ADVANCED YAMAHA ACTIVE SERVO TECHNOLOGY II
Son des basses
de grande
amplitude
Port
Boîtier
Convertisseur d’impédance
avancé
Amplificateur
Active Servo
Processing
Signaux de basse amplitude
Boumeur à air
(Résonateur de
Helmholtz)
Signaux
YST-SW225_G.book Page 14 Wednesday, July 28, 2004 10:57 AM
33


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