08-09-06, 22:21
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#1
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 Stage 5
Join Date: Feb 2005
Posts: 598
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clasa AB sau D ?
clasa AB sau D ?
-Se dau 2 amplificatoare in jurul a 15 milioane:
JBL1201.1 clasa D si DLS A6 clasa AB
Care este de preferat? Argumentati.
-Cablaj 2AWG unde gasesc si care este pretul decent la el?
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30-09-06, 22:12
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#2
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 Stage 3
Join Date: Jun 2005
Posts: 95
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Re: clasa AB sau D ?
Kit de cabluri gasesti la majoritatea instalatorilor car-audio , pret nu stiu
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30-09-06, 22:20
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#3
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Stage 5
Join Date: Dec 2004
Posts: 2,501
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Re: clasa AB sau D ?
cablu stinger custom pro e vreo 300 mii metru de 0AWG..de 2 nu`s daca au...
uitete si la tornadotrade.ro
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30-09-06, 22:25
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#4
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Stage 5
Join Date: Mar 2004
Posts: 2,302
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Re: clasa AB sau D ?
2AWG gasesti sigur la tornadotrade
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30-09-06, 22:37
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#5
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Stage 5
Join Date: May 2005
Posts: 1,266
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Re: clasa AB sau D ?
Clasa D este cel care consuma mult mai putin , este digital ...dar calitatea sunetului este mai proasta..iar clasa A/B este cel care consuma muuult , dar calitatea sunetului este mai buna, o explicatie cat de cat simpla si la subiect.
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30-09-06, 22:44
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#6
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Stage 5
Join Date: Dec 2004
Posts: 2,501
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Re: clasa AB sau D ?
diferenta de consum intre ele este de max 20%...asa ca paote nu merita sa stici sunetu pt un sonsum putin mai mic :P
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01-10-06, 00:07
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#7
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Stage 5
Join Date: May 2005
Posts: 1,266
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Re: clasa AB sau D ?
Baiii ...asta cu SQ , du te domne de aici mah , du te de aici n auzi ...D 
Sincer...acum nu cred ca dif. de consum este asa d mica..cum ai ajus tu la concl. asta ?
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01-10-06, 08:41
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#8
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Stage 5
Join Date: Apr 2004
Posts: 386
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Re: clasa AB sau D ?
bre collins, teoria e frumoasa... dar practica ne omoara...
Cauta si matale in documentatia foarte tehnica sau in niste teste din "real world" cam ce eficienta au amplificatoarele in clasa AB si in clasa D si dupa aia vezi ce concluzii tragi de unul singur.
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01-10-06, 09:47
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#9
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Speed Daemons Member
Stage 5
Join Date: Nov 2004
Posts: 513
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Re: clasa AB sau D ?
nu mai bine le tragi aici, ca si eu sunt interesat de problema asta?
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01-10-06, 18:44
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#10
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BMW Driver
Stage 5
Join Date: Jul 2004
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Re: clasa AB sau D ?
Depending upon the construction, amplifiers are
divided into different classes, there are class A, AB,
B or C. The characteristic mark for a class A amplifier
is the lack of switching noise distortion, which the
other types have. The class A amplifier also has a
higher idle current, but instead it creates a much better
resoulution and dynamics. For home use the class
A amplifiers are not very common, many people think
they are only for sound connoisseurs and Hi-Fi
entusiasts.Powers from 2x15 up to 2x50 Watts are
common on these types, no high power, but instead
real good AC/DC-converters with reliable power
resources.
The most common amplifier type is class AB.
Now you can also find class "D" amplifiers. Class D
amplifiers process the signal in a digital way and this
gives the amplifier a high efficiency. A normal class
AB amplifier has an efficiency of around 50%. This
means that a 500 watt amplifier will take up to a 1000
watts from the battery and 50% of it will be transformed
to heat. The power transistors must work very
hard and will get very hot. A class D amplifier has an
efficiency of 80-90%. and the heat dissipation is much
lower. The power consumption is also much lower.
The disadvantage of a class D amplifier is the higher
distorsion and it is also difficult to make it work over
the entire audiable frequency range. Class D amplifiers
are normally used only as subwoofer amplifiers with
limited frequency range.
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01-10-06, 18:48
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#11
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Speed Daemons Member
Stage 5
Join Date: Nov 2004
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Re: clasa AB sau D ?
mai, teorie o stim mai toti, intrebarea cred ca se referea la cat de perceptibila este acea diferenta de calitate intre ab si d-class si daca poate fi trecuta cu vederea in ipoteza eficientei mult mai mari...
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01-10-06, 21:20
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#12
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Stage 5
Join Date: Feb 2005
Posts: 598
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Re: clasa AB sau D ?
am ales AB, acum ramane de gasit difuzorul potrivit
Last edited by mmneg; 01-10-06 at 21:22.
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01-10-06, 23:05
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#13
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Stage 5
Join Date: Apr 2004
Posts: 386
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Re: clasa AB sau D ?
Quote:
Originally Posted by mmneg
clasa AB sau D ?
-Se dau 2 amplificatoare in jurul a 15 milioane:
JBL1201.1 clasa D si DLS A6 clasa AB
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Vis-a-vis de clasa AB vs D hai sa trecem un pic mai la concret:
JBL 1201.1 clasa D
http://manuals.harman.com/JBL/CAR/Ow...AmpII%20om.pdf
Producatorul zice urmatoarele:
Maximum current draw - 115A
1114 watts RMS x 1 channel at 2 ohms, 14.4V supply and ≤ 1% THD + N
DLS A6 Clasa AB
http://www.dls.se/english/fstark/a6n.htm
Producatorul zice urmatoarele:
Output power in 1 ohm: 1200 W
RMS output per channel at 13,8 volts, < 0,1% distortion.
Current draw, maximum: 140 A
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02-10-06, 05:38
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#14
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Stage 5
Join Date: May 2005
Posts: 1,266
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Re: clasa AB sau D ?
dap , se pare ca dif. este destul de mica , din ce ai aratat tu acolo radu...pe langa faptul ca c. D da puterea aceea la 14.4V constant , pe langa c. AB care da la 13.8 constant...(si da si un pic mai mult totusi)
Total Harmonic D. se pare ca este la fel la amandoua ,dar sincer nu cred...cu siguranta e mai mare la D
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02-10-06, 11:30
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#15
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Speed Daemons Member
Stage 5
Join Date: Nov 2004
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Re: clasa AB sau D ?
de ce spui ca e la fel? 1% thd+n = 0.1% ? intreb si eu, nu dau cu parul...
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