What do I need to set up digital music server?

My system consists of MacMini with external 1TB drive, Apple Express (Wi-Fi receiver on my network), Benchmark DAC1 (D/A converter with volume control) and power amp. I rip CDs, using free "MAX", to ALAC format (Apple Lossless Audio Codec). I use Itunes to organize and play albums. As long as you send all the bits ("bit perfect") nothing on this side (computer, software etc.) makes any difference. Music data is sent in packets to wireless receiver (Airport Express) that recreates timing producing S/Pdif stream going into DAC. Up to this point music was just data thus had no timing but now it becomes digital music stream in S/Pdif format. It is important that bits in this stream are recognized in D/A converter in exact time intervals. Any uncertainty in time converts to noise on the analog side. It is called Jitter. Jitter at this point is the only thing that can affect sound. After conversion you get analog outputs of your DAC and connect to amplifier.

Reducing time jitter of the S/Pdif stream is the most important thing. You can achieve it by using good wireless receiver (Airport Express is not horrible but it is not great either), reclocker or jitter suppressing DAC (like my Benchmark DAC1). Reclocker, that you can install later, will give you better jitter suppression than DAC and will make you more flexible with your choice of DACs. Think of reclocker as buffer that corrects moments of transistions.

I don't use reclocker, happy with suppression of my Benchmark DAC1, but you can find few of them on the market. One of them is manufactured by Empirical Audio. Steve Nugend of Empirical Audio is very knowledgeable and active on this forum.

In spite of bits coming to DAC in exactly same intervals (no jitter) DAC itself might create jitter when noise is present since transtions from one level to another take time (uncertian threshold). Because of that you should use power supply filters and good shielding on the cables. My DAC has 3 switchable digital inputs. I have my CDP and TV connected to two others.

Thanks for your responses. In "C" I was trying to say, I want to be able to transfer my CD collection over to digital files.

As I explore more about this I can see that there are a number of different approaches taken by different manufacturers. Some products are all in one with storage, DAC, CD drive, digital music player and software in one unit. On the other hand there are many products that do only one or two of those functions.

So,,,If I have an external DAC and and external storage device then all I would need is the digital music player with a remote or use an Ipad. Then I could "rip" music from my CDs using my lap top. Am I getting closer here?

Lets make your life easier

1. do some browing on http://www.computeraudiophile.com/
if you are curious and a hobbyist PC builder
2. if not buy a spec system like the Carbon; with Jriver media player software and an external CD/DVD drive for ripping, that should get you well set up for least fuss at $1500

If you are Mac oriented you can buy a Mojo Audio set up Mac server for about $2300

http://shop.smallgreencomputer.com/CAPS-v3-Carbon-CAPS3-Carbon.htm

this all assumes you have the server connected via hardwire Ethernet to your wireless router so that you can Wifi control it with your mobile phone or an iPad.

For your budget I would recommend the following:

1) Oct 2009 Mac Mini with Snow Leopard disk, keyboard and mouse - upgrade with SSD and increase DRAM to 8gigs - total outlay $600 - buy it on ebay for details see:

http://www.empiricalaudio.com/computer-audio/recommended-systems

2) Amarra, Pure Music or Audirvana software - ~$74-300

3) upgrade power supply for the Mini from paulhynesdesign.com or equivalent - $800-900

4) good USB cable to go to a USB DAC or USB converter - $450

You do not rip CD's with your CD player. You rip them using XLD on the Mac Mini. IT has a slot drive. XLD is freeware.

This will beat 99% of servers out there, including Linn and Naim. You would have to spend at least $5K on a all-in-one server to beat this.

You never said whether you need digital source or analog source. If you are currently using your CD player left and right analog outs, then you will need a DAC. If you are using your CD as a digital transport, then you will need a USB to Coax digital converter. (USB converter) Big difference in cost.

The thing to understand is that the digital master clock is the most important thing in any digital system. This clock currently resides in your CD player, but must be located elsewhere for a computer audio system. The best place to locate it is in a USB converter, where you can have independent high-quality power supply. The USB converter can drive digital to your DAC, SS processor or Home theater receiver.

Steve N.
Empirical Audio

What DAC are you planning to use?

My preference would be to just get a CAPS 3.0 build, and run JRiver and Jremote on iDevice for remote control. (Discaimer: I hate Mac)

You can buy them prebuild at smallgreencomputer, for around $1200.

If you want to spend more down the line you can run Dirac Live on the CAPS, and you can get external battery power.