Jak prawidłowo podłączyć głośniki 4 ohm do wzmacniacza 8 ohm z użyciem opornika?

Sun Mar 14, 2004 6:54 am   

Jak podłączyć głośniki 4 omowe do wzmacniacza z wyjściem 8 omów? Czy
opornik rozwiąże sprawę?

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Pozdrawiam
Maciek C
maciek82[at]idea.net.pl

Sun Mar 14, 2004 7:03 am   

"Maciek C" <maciek82wytnij_toidea.net.pl> wrote in message
news:4053910c$1@news.vogel.pl...

Częściowo tak, ale może się pogorszyć jakość odtwarzania, spada moc
przekazywana do kolumn a oporniki się grzeją.
A co to za wzmacniacz??? Wiele wzmacniaczy może pracować z kolumnami o
niższej oporności, nie należy tylko przesadzać z "czadem".

Roman

Sun Mar 14, 2004 7:06 am   

Hmm, nie wiem dokładnie bo to problem znajomego, ale po tym co stoi u
niego w domu to wnioskuje, ze to historyczna Diora :)

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Pozdrawiam
Maciek C
maciek82[at]idea.net.pl

Sun Mar 14, 2004 7:07 am   

Maciek C wrote:

A jeśli już oporniki, to jaka moc?? Jakoś to wyliczać?

--
Pozdrawiam
Maciek C
maciek82[at]idea.net.pl

Sun Mar 14, 2004 7:28 am   

Użytkownik "Maciek C" <maciek82wytnij_toidea.net.pl> napisał w wiadomości
news:40539416@news.vogel.pl...

a co to za wzmacniacz bo moze da sie bez oporkow podlaczyc



noo powinno starczyc 1/2 mocy wzmacniacza - a wyliczasie ze wzorku P=R*I*I

ps
nie zapominaj o glosniku w szeregu

Sun Mar 14, 2004 7:28 am   

"Maciek C" <maciek82wytnij_toidea.net.pl> wrote in message
news:40539416@news.vogel.pl...

No jeśli historyczna to może nie mieć wewnętrznej ochrony przed
przeciążeniami. Przy "przeczadowaniu" mogą spalić się jakieś bezpieczniki a
i końcówka mocy może polecieć.



Daj np. 3,3 Ohm na kanał, moc - około połowa maksymalnej mocy wyjściowej
tego wzmacniacza (z jednego kanału). Oprniki najlepiej te białe, ceramiczne
po 5 Wat.
Jeśli by było, że trzeba np. 10 Wat to dajesz równolegle dwa takie oporniki
po 6,8 Ohm.

Roman

Sun Mar 14, 2004 7:48 pm   

ale bardzo pogorszy jakość dźwięku.
Zestawy głośnikowe buduje się przy założniu, że będą sterowane z jak
najmniejszej oporności (oporność wyjściowa wzmacniacza + oporność kabli).
Bliska zeru oporność zasilania tłumi pasożytnicze rezonanse głośników -
w takim układzie mierzy się parametry akustyczne kolumny.
Dodanie opornika powoduje pojawienie się rezonansów - basy dudnią, średnie
tony podbarwiają się "papierowo" lub "metalicznie" - ogólnie dźwięk staje się
nienaturalny.
Większość wzmacniaczy "8-omowych" (bez elektronicznych zabezpieczeń,
a stara Diora napewno nie miała takich) wytrzymuje pracę z 4 om.
Moc muzyczna rośnie prawie dwukrotnie, zwiększa się współczynnik zawartości
harmonicznych (mierzalnie, ale słabo słyszalnie przed przesterowaniem),
oczywiście wzmacniacz bardziej się grzeje.
Należy wzmacniaczowi zapewnić poprawną wentylację, podłączyć głośniki
bezpośrednio i zagrać, nie podkręcać bezmyślnie gałki "do dechy" i cieszyć się
pięknym brzmieniem - czasem sprawdzić temperaturę wzmacniacza.
Wmak


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