Originally Posted by monoethylene
1) I am happy to tell you that I can read!!
Then please read the posts leading up to this.
2) I am planning on using USB??
And you wonder why I asked if you could read. This was the course of convo before you came in:
Maverick suggested the Benchmark DAC as something many in the SS sub-forum would give a nod to. It is well engineered across the board without snake oil to bolster sales.
I said the DacMagic measured similarly except the USB. I suggested that if people were planning on using USB, something else may be better. Equally, I wouldn't pay the DacMagic price for the level of USB performance. Everything else is solid.
Someone brought up that the noise floor was still very low from the jitter, and that it probably doesn't matter.
I agreed, but when there's probably a better circuit for the same price. As such it is worth examining for those wanting USB as their primary input. I said, for me I didn't like the high levels (in-spite of audibility).
Someone noted this as being a bit paranoid, or "the salesman's best friend". I agree, but I'm a sucker for good engineering and circuits.
Dyno went on his tangent.
I stated for a second time that the difference probably isn't audible. I fail to see why one would pay the level of money asked for such performance though, and said for me the jitter is too high for my liking (audible or not) as it shows the USB circuit isn't particularly resilient to jitter when a switching PSU is used with the PC (aka every PC ever).
Then you came in.
Does everything make sense now?
3) Because I have the money and I want to spend it!!
. . . I don't even care to respond to this.
I would imagine, if you have a normal, mains powered PC with standard switching PSU, that a 30 dollar DIY USB isolation kit would have much the same effect.
It's hard to say if other similarly priced USB only Dacs would suffer the same problem (they may already have the isolation built-in for example). I did mention isolation though in my post (327), which indeed could probably lower the jitter to other input levels. It seems redundant when there's other options though, unless you plan on using everything the DacMagic has or score a really good price.
We also have to consider if just a cheap USB DAC and an isolation kit would offer similar performance too though. If it did one would get cheaper and better performance than buying the DacMagic out of box. It still becomes hard to justify the DacMagic as a USB primary DAC.
That is of course my opinion being a bit on the cautious side, because I don't know what the noisiest PSU is and how much jitter it will ultimately add. For all we know there could be a horrendous no-name PSU being ran near balls to the wall max near death that would make a DacMagic jump substantially higher than the 3.5ns Cambridge has seen (from a well operating laptop PSU). We could argue in such a case the person has more to worry about than the DAC, but having seen just how crummy some PSUs are I rather not make a recommendation that depends on it being absolute quality and still hitting 3ns.
Edited by Shike - 7/2/11 at 7:15am