Philips USB DAC sa TDA1541A

[coolmih]

Ako zelite da pretvorite vas desktop PC ili laptop u vrhunski i kvalitetan audio plejer tj. izvor zvuka, ovaj stand-alone uredjaj je idealna stvar za vas a koji, u isto vreme, ne kosta citavo bogatstvo. Ovaj Philips USB DAC je modifikovani DSR tjuner koji u sebi ima kultni DAC chip medju audifilima - cuveni TDA1541A (OverSampling mod 16bita/44.1kHz) a kao USB risiver chip instaliran je BB PCM2707 sa odlicnim karakteristikama. U samom analognom delu nalaze se kvalitetni Rubycon kondezatori sto je ziasta iznenadjujuce i za pohvalu. Sama I/V konverzija izlaznog signala iz DACa je odradjena sa 4 x NE5532 OPAmpa a oko samog DACa je i mnostvo decoupling kondezatora (sve fabricko stanje kao sto se i vidi na slici br.3 - pre nadogradnje). Sekcija napajanja i naponsko-regulatorni deo je zaista kvalitetno uradjen sa masivnim ELNA elektrolitima. Uredjaj je zaista ocuvan u potpunosti i estetski i funkcionalno je ispravan - ukupna ocena za uredja je 9/10. Pozadi su pozlaceni RCA konektori kao i digitalni SPDIF i TOSLINK izlazi (tako da mozete dalje da prosledite SPDIF digitlani signal sa vaseg PCija, eventualno u neki drugi DAC i da poredite analogni zvuk ovog uredjaja sa nekim drugim) i USB ulaz (konektor tip . Sa prednje strane ima i konektor za headphone koji je prakticna stvar kada hocete da slusate muziku sa PCija (radi kao headphone pojacivac). O zvuku necu suvise da pricam jer se vec mnogo toga zna kako zvuci ovaj 'old school' Philips DAC TDA1541A. Za ulozeni novac u ovaj ovakav uredjaj - dobijate visestruko funkcionalni uredjaj sa kvalitetnim analognim izlazom koji moze da zadovolji skoro pa sve audiofilske zahteve koji uzivaoci Hi-Fi (pogotovu oni koji PC koriste kao glavni izvor zvuka) mogu da imaju. Cena 180 eur.

[zek]

'El to sokoćalo radi samo sa CD formatom; ništa 24/96 ili 24/192?

[coolmih]

Napisah gore nedje da je ovo 16bitna/44.1kHz(48kHz) masina ali ima jedna interesantna stvar da podrzava 24bitne audio zapise ali sa sampling rate-om ne vecim od 48kHz. E, sad ja se nesekiram mnogo zbog toga jer ako hocu da slusam bas 24/96(192) audio Flac (koji je jos u povoju i pitanje je sta sve mi zaista skidamo sa neta), lepo podesim Foobar da downsampluje ovih 24/96 na zeljeni 24/48, ili 16/48 ili 16/44.1 redbook standard. Veruj mi sve je relativno. Posedujem fenomenalan 16/44.1 audio flac koji je extra produkcija i koji bolje zvuci (potpisujem ti to) od mnogih 24/96 snimaka (tkz digital studio master zapisa - barem tako stoji da je digital download, a da ne pricam o tamo nekim 24/96 vinyl rip tj. snimaka sa ploca koji su ocaj zivi i sve sam ih izbrisao sa HDDa).

Suma sumarum, dobra i kvalitetna produkcija i u 16b/44.1kHz formatu (npr. flac sa XRCD, ili SHMCD koja otkidaju u odnosu na klasican CD rip) zna da zaseni mnostvo kojekakvih (zanrovski potpuno nepoznatih) 24/96 audio zapisa. I ja sam se zanosio mislju da po svaku cenu nabavim nov 24/96(192) DAC ali zaista posle iscitavanja teksta ispod, shvatio sam da do dobrog zvuka put ne vodi samo preko 24/96(192) DACa vec da se tu mnostvo stvari uplicu i preplicu. Da ne ulazim u neku drugu diskusiju, ovo je uredjaj koji ce zasigurno jos sluziti bez obzira na hype oko 24/96(192) DACova. Sta vise (po meni) je mnogo bitnije ono sta se dalje desava u topologiji posle DAC chipa (I/V konverzija, stabilno i korektno odradjeno napajanje i regulacija napona, kvalitet kondica u analognom izlaznom stepenu, odabir opampova, lampe u izlaznom delu, itd, itd.).

Procitaj ovo pa razmisli posle:

" WHY TDA1541A DAC ?

THE BIG QUESTION: Mr. Fikus, are you dogmatic about using old shit and why you deny the technical progress of our wonderful industry? Are you some kind of a lunatic, a gaslight advocate? Are you a hi-fi Amish? Are you on drugs? What is wrong with you that you do not like 24 bit/192 KHz and HDCD and SACD and VLSI chips?

Here is what I can say: There are two kinds of resolution: digital and analogue. We can talk in digital "language" and conclude, that a digital information can have a certain - say 16 bit - word length. And the chip that reads it must be able to operate with 16 bit length of words. But can it (DAC) put out the resulting sine wave with similar accuracy ??? That is the KEY QUESTION.

Bits are the smallest measurement units which we can apply to the process. It is sort of like in digital cameras. Would you buy a 100 Euro Casio pocket camera which has a CCD with 10 million pixels or rather a 8 million Canon D30 XLR? The number of pixels on the casio is better, but it is all lost in firmware, compression, lens quality, accuracy of power supply, etc. In music reproduction, our CD has 16 bits. No matter what DAC we use - it is still 16 bits. That's means that we can reproduce a 2 V pp signal with accuracy of 2/65500 Volts.

So why the cheap DVD player with real 24 bits is not immediately better? Because increasing the digital resolution does not have a chance to come through the process. The fact that digitally speaking the chip can "understand the word -length of 24 bits" does not guarantee, that after reading it will output music of equally great nuance resolution. Remember - reading is not understanding. Just like with this text. Because the other elements which play role - the timing of impulses (clock) and the power supply stability and the analog stage - all have possibility to reproduce signal with accuracy of say 0,01 % which is 1/10000 which is far from 1/65500 and VERY FAR from 24 bit number, which is 2 to the 24th power, which is 65500 times 2 to 8-ght power which is A LOT. Actually it is 17 millions.

The non mathematical explanation is possible if we take the example of say the printer. Some printer manufacturer can claim the resolution of 20 000 dpi. This may be a valid claim for the ink injecting head resolution and it's software, but the "analog" result will be that the drop of ink will smear over an area 10 x bigger than its injector nozzle, and the paper structure has fibres 10 x bigger than the 20 000 dpi requires. So the picture limitation is in the paper ink interaction, not the head injector resolution. Not to mention accuracy of head movement on the rails, temperature of injectors, air pressure and humidity etc.

So somebody promising a resolution of 24 bits is effectively claming that he produced electrical device which controls the output signal to a wide range of loads with accuracy of one/17 millionth part of a volt.

THIS CLAIM IS NOT VERY SERIOUS. We take it with a grain of salt.

So dear readers, there is no correlation between increased number of bits above 16 and sound quality. At least it is not automatically guaranteed. I suggest we rather concentrate on the best usage of the bits which we have, than worry of these bits we don't have."

[sir Oliver]

Zar nije bio prodat već?

[coolmih]

Jes jedan prodat, ovaj sto se sada nudi je drugi - mislio sam da ga ostavim za sebe ali .... stiglo nesto novo (tj staro) a i znas da imam i Sony MD pa rekoh da malo rascistim policu.

[coolmih]

Nova snizena cena: 170 eur

[coolmih]

Jesenji popust - obradujte sebe i svoj PC ovim odlicnim i prakticnim uredjajem.

150 eur

[coolmih]

Jesenji popust - obradujte sebe i svoj PC ovim odlicnim i prakticnim uredjajem.

150 eur

Aktuelno!

[coolmih]

Prodato, moze kljuc !