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DAC (Digitalno-analogni konverteri)

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Re: DAC (Digitalno-analogni konverteri)

Post by first » 30 Aug 2011, 20:28

prophet wrote: BTW, kolika je cena Asus dac-a i kolika je cena kablova sa gornje fotografije?
Za DAC nisam siguran, nesto oko 350-400€, a USB Furutech kosta oko 80€, to sam vec napisao.

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Re: DAC (Digitalno-analogni konverteri)

Post by gvlada » 30 Aug 2011, 22:40

One je izlistan u UK oko 270GBP, sto bi kod nas bilo nadajmo se do 300e.
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Re: DAC (Digitalno-analogni konverteri)

Post by DejanM » 31 Aug 2011, 08:24

Evo jednog alternativnog pristupa ... Kupi se na eBay jedan stari ali dobar DAC. Recimo Parasound DAC 1500. Moze da se nadje trenutno za 480 eura. Ovde imate spec ovog DACa:

http://www.parasound.com/vintage/dac1500.php

Znaci, radi se o pravom malom biseru - doduse malo zastarelom. Ali chipovi koji su korisceni unutra se i danas smatraju za odlicne, narocito BB 63 K. E onda kazete, da je najveca mana ovih DACova sto ne moze da prima 24 bita i vece sampling frekvencije od 48KHz. Ako vam je to bitno, onda odete ovde i kupite upgrade chipova:

http://www.audiotuning.de/english/index.html

Zatim zamenite elektrolite i to je to ... Dobicete jako dobar DAC po ceni koja ce biti dosta niza od 1000 eura ...

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Re: DAC (Digitalno-analogni konverteri)

Post by prophet » 31 Aug 2011, 22:47

Ne bih ja tu ništa diro :D Mislim da Žika ima ovaj DAC.

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Re: DAC (Digitalno-analogni konverteri)

Post by DejanM » 01 Sep 2011, 07:37

prophet wrote:Ne bih ja tu ništa diro :D Mislim da Žika ima ovaj DAC.
Ne bi bilo lose kada bi Zika napisao utiske ... Radi se o 2 BB 63K chipa po kanalu (znaci ukupno 4 DAC Chipa) sa dobrim receiverom CS8412 dok je digitalni filter malo losiji. Ako se medjutim ode po model 1600 onda se pored pomenutih chipova dobije i PMD100. Napajanje je uradjeno korektno, regulacija je diskretna, balansirani i RCA izlazi, solidan set digitalnih ulaza, ... Sta treba vise ?

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Re: DAC (Digitalno-analogni konverteri)

Post by first » 08 Sep 2011, 18:23

Po prvim informacijama, konačno je spreman za tržište novi Audiolab M-DAC.
Najavljuje se da će uređaj biti u britanskim prodavnicama već u prvoj nedelji oktobra, a koštaće oko 500 GBP.
Audiolab M-DAC takođe koristi ESS 9018 Sabre čip, ali je implementacija nešto drukčija u odnosu na 8200CD.
A evo pojavila se i neka sličica uređaja....
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Re: DAC (Digitalno-analogni konverteri)

Post by gvlada » 08 Sep 2011, 18:51

Ima li nekih detalja, broj konekcija i sl?
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Re: DAC (Digitalno-analogni konverteri)

Post by first » 08 Sep 2011, 19:18

gvlada wrote:Ima li nekih detalja, broj konekcija i sl?
Kao i 8200CD, od ulaza USB, 2 optička, 2 coax, a izlazi RCA i XLR, kao i 1 opt. i 1 coax.
Audiolab M-DAC je istovremeno pretpojačalo, D/A konverter i pojačalo za slušalice, a za više detalja se malo strpi...

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Re: DAC (Digitalno-analogni konverteri)

Post by gvlada » 08 Sep 2011, 19:21

Svidja mi se sto je ess a za usb bi bilo lepo da je 192/24 :-)
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Re: DAC (Digitalno-analogni konverteri)

Post by first » 08 Sep 2011, 19:28

gvlada wrote:Svidja mi se sto je ess a za usb bi bilo lepo da je 192/24 :-)
...nije, preko optičkog i USB-a je 96/24, a preko coax-a je 192/24.

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Re: DAC (Digitalno-analogni konverteri)

Post by DejanM » 08 Sep 2011, 20:01

Ovako spolja to izgleda dobro. Velika kutija, za te novce ...

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Re: DAC (Digitalno-analogni konverteri)

Post by first » 08 Sep 2011, 20:11

DejanM wrote:Ovako spolja to izgleda dobro. Velika kutija, za te novce ...
Nemoj da te fotografija zavara, kućište nije standardne širine.

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Re: DAC (Digitalno-analogni konverteri)

Post by gvlada » 08 Sep 2011, 20:17

Nesto kao M1 DAC, Onkyo DAC i sl uredjaji, 27cm ako se ne varam.
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Re: DAC (Digitalno-analogni konverteri)

Post by first » 13 Oct 2011, 13:29

Evo i jedna sličica zadnjeg panela Audiolab M-DAC-a
Audiolab M-DAC_back.jpg
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Audiolab M-DAC_back.jpg
Audiolab M-DAC_back.jpg (70 KiB) Viewed 1390 times
U prilogu su i tehnički podaci

Output Level @ 1KHz, RCA 2.25Vrms ±0.1, XLR 4.5Vrms ±0.1
Frequency Response, Ref. 1kHz, 20Hz to 20KHz ±0.2dB
THD 1KHz, 0dB, 20Hz to 20kHz BW RCA & XLR <0.0015%
Crosstalk 1kHz, RCA >120dB, XLR >130dB
Dynamic Range Awtd, RCA =>114.5dB, XLR =>121.5dB
32Bit 84.000MHz 512 Element MultiBit Array DAC
Asynchronous USB supporting 24 Bits / 96kHz with Remote Control of PC / MAC Media Player via HID support
x2 192KHz 24Bits Coax SPDIF Digital Inputs
x2 96KHz Optical Digital Inputs
High Current, High Linearity RCA Single Ended & XLR True Balanced with fully discrete JFET CROSS* Class A Output stage’s
High Current, High Linearity CROSS* JFET Class A Headphone Amplifier
Triple cascaded Jitter attenuation stages, with triple cascaded Asynchronies Clock domain isolation – all but eliminating the First order effects of Jitter from the external input sources on the Digital to Audio Conversion process
Selectable DAC Mode or Digital Pre-Amplifier Mode, allowing direct connection to Power Amplifiers and Active speakers in Digital only systems
2.7” High contrast OLED display
“Bit Perfect” Digital Data source analyzer
Intelligent real-time Bit Depth analysis engine – Displays the “True” Bit depth of the Digital input source
Digital Data Decorrelation Engine – Decorrelates the fixed “LSB’s” data pattern within the Audio data stream when less then 24Bits. Data decorrelation at the DAC substrate level reduces both Digital and Analogue Second order effects within the DAC at the silicon Die level
MS Windows LSB Data restoration for “Bit Perfect” reply – corrects Windows’ LSB rounding errors. Allows Bit Perfect “Plug and Play” with Windows Media Player
ASYNC USB Buffer level display to insure correct functionality and diagnostics of the USB HOST device in ASYNC Audio streaming mode
“Actual” or “Nominal” Sampling Frequency display – displays the TRUE input sampling frequency with 1Hz resolution
Digital level meters in dB with Peak hold
CD / DVD SPDIF subcode embedded Track and Time Display
Advanced De-Jittered Optical and Coax Digital SPDIF Output, including USB Audio
Selectable Optical or Coax Clock-Lock interface – allowing “Jitter Free” Clock-Locked connection with compatible CD transports etc
Full Remote Control + External Remote / BUS I/O loop
26 Internal Regulated supply rails
10 Ultra Low Noise, Low Impedance Discrete Regulators
7 User Selectable Digital Filters – Fully Software upgradeable via the USB Port
Master Clock Jitter less then 3pS Short Term - Measured directly at DAC “XOut”
Organic Ultra Low ESR capacitors, High Tolerance Polypropylene film / Foil capacitors, Ultra Stable Very Low VCR 0.1% MELF SMD resistors, 4 Layer PCB
External upgradeable Power supply interface for a future upgrade path

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Re: DAC (Digitalno-analogni konverteri)

Post by gvlada » 13 Oct 2011, 14:00

Simpaticno, samo i dalje ne kapiram sto ogranicavaju optical i usb na 96/24. Ok, nema mnogo 192k materijala ali opet.... svaki AVR od najjeftinijeg do najskupljeg podrzava 192/24 preko optike i niko se nije zalio da prekida, cak i Asusov One radi isto. Mada, verovatno ce naredni model da ima svuda podrsku za to i moci ce da kazu da su napravili nesto novo i bolje. :)
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