2. pc-audio
  3. 1149558729

Up to the Minute: Streaming Bits to Audiophile DAC

I have some unanswered questions from another thread, and also some new ones despite searching the archives. So I hope this thread might be a good place for all of us who are interested in state of the art audio quality from hard disk drive based files.

Kublakhan in another thread suggested using the Sweetwater Creation Stations as hardware for a PC based audio solution and so far this gear looks pretty good to me.

My questions, however, arise from the fact that there may be some disconnect between the conventions for "pro audio" and "audiophile" audio.

So as of this writing, can anyone please explain:

Why does every pro audio person seem confused when I tell them I want to use an external DAC?

What is the BEST way to extract bit for bit data from a hard drive, to export to an audiophile DAC?

Why oh why do expensive $$$ music or media servers, which are supposedly configured to optimize audio use, nonetheless require some sort of cheapo "interface" to stream the data into an audiophile DAC?

Why on earth would I want to buy an audiophile "sound card", which I presume (in addition to an "interface") also has its own DAC?

Given the options which are available for "sound card" and/or "interface" type devices, what is the BEST way to tap the bitstream and/or maximize performance of the audiophile DAC? Optical? TOSLINK? Spdif?

Given the choices I might have for the "interface" between the computer and the DAC, what is the BEST way to minimized "jitter" or other audiophile nasties? Or is that phenomenon more of a downstream issue AFTER the bitstream hits the DAC?

There is a lot of great information in the other threads about ripping, tagging, Foobar vs Itunes and a million other complications of hard drive based audio.

But for now, I would really appreciate just some basic, conclusive opinions on the best way to get bits off the hard drive and safely on their way to my speakers from an audiophile DAC.

Please advise.

THANK YOU.
cwlondon
audioengr
3,282 posts
 
"With word-clock, (and the addition of a master-clock and compatible DAC, digital amp, or digital speakers) the home audiophile can put the kabosh on the sonic artifacts of interconnect generated jitter once and for all (the way the studios have been doing it for years)."

Sounds good, but the reality is that noone that I am aware of has made the word-clock work yet. The fact is, most modern consumer DAC's, such as the Benchmark DAC-1 use D/A chips that perform the D/A using the bit-clock, not the word clock. No improvement in the word-clock will make any difference at all. It's the bit-clock or master clock that need to be low jitter, not the word-clock.

Steve N.
Empirical Audio
Manufacturer
cwlondon OP
1,198 posts
 
http://cachepe.zzounds.com/media/quality,85/brand,zzounds/UCA202_big-c5c66c5ee06b3a89a1fe3b25a7ba0cb3.jpg

Can anyone guess what this interface does?

I still dont understand how I can plug a cheap device into my USB port and it somehow knows if I want to extract an analogue signal or stream bits.

Would the optical output stream bits?

In the case of an analogue signal (for example, the headphone output) would this thing look through to the DAC in my Sony VAIO laptop, or would it also have its own cheap DAC thrown in for the low low price of 30 bucks?

I started to write a new thread - "Streaming Bits for Dummies" but thought I should continue here.....

For the most part, I am still clueless.

Thank you.
audioengr
3,282 posts
 
I believe this device is very similar to the M-Audio Transit, but it probably uses the PCM270X chips instead and no software driver. Unlike the Transit, it would be limited to 48kHz.

You could get digital S/PDIF output from it just like the Transit from the optical output. Like the Transit, it uses a cheap clock inside, so very jittery I suspect.

There is also a D/A and an A/D inside, so you get analog outputs. Like the Transit, the power supply on this comes from the 5VDC off the USB cable which orginates at the computer. You can guess how clean this power is.....
cwlondon OP
1,198 posts
 
Hi Steve and thanks.

* So this thing will output SPDIF, but only through an optical output which is not best execution?

* Furthermore it is limited to 48khz?

* And the whole set up will be prone to jitter?

* And whatever problems you would also get from a cheap and noisy power supply?

Sounds like we are still in the dark ages for streaming bits to an audiophile DAC?
audioengr
3,282 posts
 
CWlondon - No, we are not in the dark ages, you are just looking in the wrong places IMO.

Steve N.
More to discover