Are most DAC's compatible w computers?


I have an SPDIF output that comes directly off my harddrive on my windows xp based computer. I also use windows media. i was thinking about inputing this into a tube DAC to both increase the sound quality and flexibility in my system configuration.
I wanted something fairly inexpensive... I would like to spend $300 or less and have been looking at Cal Labs Sigma II.

Is this straightforward no brainer kind of stuff or is there something that I'm not thinking of... like compatiblity issues?

Thanks,
Doug
lokie

Showing 3 responses by ckorody

In my experience - and I am a Mac guy, not a Windows guy - it will work.

But this is also a bit like saying cables are cables and tubes are tubes. Meaning that while it will work, it is probably not the best way to get where you want to go.

There are many posts in PC Audio on the subject and also on the Asylum. To summarize, the consensus seems to be:

The computer environment, with its switching power supplies, disks, RAM etc is a nasty environment. Getting the signal out of the box before processing it is universally seen as highly desirable.

There are a number of ways to do this:

- USB out via something like Waveterminal or directly to the DAC is a universally acclaimed solution that seems to work very well for everyone regardless of operating system.

- SLIM (slimdevices.com) can be connected via either WiFi or ethernet, have a DAC built in and also offer SPDIF out

- iTunes/Air Express solutions are working for some where line of sight is practical

In general the consensus is that a wired distribution solution is preferrable to a wireless one

SPDIF is often as big a problem as anything in the chain - for this reason Mac offers optical (Toslink) outs - of course you can find ample contention about the Toslink sound - but not about the Toslink signal....

BTW while much is made of the two way nature of USB, I can't find anything in the technical descriptions that supports the theory that USB does anything about jitter - the two way function is its device communication and control protocol - take a look at wikipedia.com

There is no doubt that the way you rip is critical. Lossless or no compression and error correction are the keys - format preferences vary but Apple Lossless (iTunes) and .wav are the preferred audiophile formats. EAC and iTunes seem to be the top choices.

Jitter is not a problem in ripped material. Jitter is an artifact of the electro-optical-mechanical process called playing the CD - a by product of trying to read data from an imperfectly reflective spinning disc at ever changing speeds in real time with a motor. In contrast all a computer has to do is retrieve relatively small chunks of data relatively slowly.

The fact that they are still having "jitter-like" problems seems to be why a lot of people are starting to think that SPDIF is the weakest link in the chain. This is the appeal of the USB direct to DAC solution.

Finally there not much question as to whether you will more readily achieve a tube sound at the DAC or the preamp - consensus is that the preamp is a better and potentially less expensive place to do this. And how often is something better and cheaper...

That said, you might want to check out the much awaited Scott Nixon TubeDac with USB input due out any week now. If what you want is audio from a hard drive this is probably a better long term investment than the Cal.

Achieving excellent results from a hard drive source requires paying attention to all the usual things - power, cables, placement, room tuning etc.

You will find 100% consensus that properly executed this is an extraordinarily cost effective way to get great playback. Doing this right is equivalent to a major component upgrade.

And it is the only way to manage a large library... simply fabulous from that perspective, SLIM and iTunes are the leaders in that category

Hope this helps
To Jax - I agree with you. But you know I am amazed by this Rankin fellow. At your recommendation, I read his website again - especially the following:

"On power up of the computer the 2 devices negotiate services... Since the USB receiver only has to handle these 3 frequencies, the clocking to the separate DAC IC has almost no jitter... Therefore the jitter problems of SPDIF almost go away using USB."

I did pass Logic and this ain't it. All this says is what we know, USB does not introduce jitter when transporting the signal from the PC to a device. Of course if I was going to charge $14K+ for a USB DAC I would be working hard to think of a good benefits statement too!

Pardales this is the real reason you might want to consider a USB DAC - because it eliminates the chance that the SPDIF from the Waveterminal to the DAC could introduce some error. Simple is most often better - getting rid of cables and connectors usually is. Plus you eliminate the cost of the Waveterminal and a good to great SPDIF cable... One reason I upgraded to a G5 is to run Toslink directly from the computer to the DAC - still evaluating but its pretty impressive with the Wireworld 5 Supernova

Please note that nowhere does Rankin say that there is any kind of error correction of the audio data during playback... I keep reading and hearing from people that think this is what is happening and I am puzzled as to how this got started.

And contrary to his site, there is most definitely a USB 2 standard which is why there are a billion plus USB devices worldwide -

Folks - you do not need to spend this kind of money to get awesome sound from your hard drive - you just need to sweat a few simple details, like anything else in our hobby. This is truly high end for the rest of us...

One last thought - if you have a G5 or a PC that supports SATA I strongly suggest you use it instead of Firewire to connect your external hard drive(s). It is vastly, infinitely, amazingly more robust and not a bit more expensive. Hard drives from the usual suspects at the usual places at ridiculous prices. Instant set up, you no longer even have to set jumpers.

Savvy vendors in this space with helpful websites are granitedigital.com and macgurus.com. You will be absolutely delighted
Hi guys -

I agree this is the future - I keep flogging the USB DAC idea - powered by iTunes and 6 billion downloads a year versus a declining CD market it seems a no brainer at many market levels...

I too have had excellent results with the Waveterminal - so clean and simple and no power supply. Sorry about the misquote on the Rankin products, I guess you would have to consider him a possible USB DAC - not too much else out there that I am aware of but you should check out
http://www.empiricalaudio.com

The gentlemen is a former Intel engineer and a big time modder who is one of the first people I ever corresponded with about the USB direct issue

Great thread - kudos to all