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Advanced Yamaha Active Servo Technology II
1998 lanserade Yamaha högtalare som använder
sig av tekniken YST (Yamaha Active Servo
Technology), vilken erbjuder kraftfull
basåtergivning av hög kvalitet. Denna teknik
använder en direkt anslutning mellan förstärkaren
och högtalaren, vilket ger en exakt
signalöverföring och precis högtalarkontroll.
Eftersom denna teknik använder högtalarelement
som styrs med förstärkarens negativa
impedansdrift och resonansen som skapas mellan
volymen i högtalarlådan och högtalarporten,
skapas det mer resonansenergi (det s.k. “luft-
baselement”) än med den vanliga
basreflexmetoden. Detta gör det möjligt att återge
basen ordentligt med mycket mindre högtalarlådor
än vad som var möjligt tidigare.
Yamahas nyutvecklade Advanced YST II-teknik,
med många förbättringar av tekniken Yamaha
Active Servo Technology, medger bättre styrning
av de krafter som driver förstärkaren och högtalare.
Sett ur förstärkarens synvinkel ändras
högtalarimpedansen i förhållande till
ljudfrekvensen. Yamaha har tagit fram en ny
kretsuppbyggnad, som kombinerar drivstegen för
negativ impedans och konstant ström och
därigenom sörjer för en stabilare prestanda och en
klar basåtergivning med mindre otydlighet i ljudet.
Basljud med hög
amplitud
Högtalarlåda
Öppning
Luftbaskanal
(Helmholtz resonator)
Avancerad
impedans
omvandlare
Förstärkare med aktiv
servobehan dling
Signaler med
låg amplitud
Signaler
38


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