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USB Length, jitter and Volume Control Questions

I've been working on a PC audio system for a few months now and I have a few questions that I cannot find the answers to.

I have a new iMac running USB>DacMagic DAC>Onix Sp3>Merlin TSM speakers. I hav had a Valab NOS DAC for a bit and have a Stello DA100 on the way. My questions is how does the volume work in these setups? With the DacMagic I can control the volume through itunes but not through the system menu bar. With the Valab I could control both iTunes and system volume. Is there a difference between the two? Does using the volume control in iTunes or system conpromise the sound? If I'm getting gain from the computer (regardless of system volume or iTuens volume) am I not essentially using the computer as a lowgrade "preamp".

Also, how long can a rung of USB cable be before the signal begins to degrade? Does USB transfer introduce jitter?

Thanks,
mailman199

Showing 2 responses by pdreher

pdreher's avatar
pdreher
1,229 posts
 
I tried running wireless via I-Mac to Airport Express to Empirical Audio Pacecar to my DAC. Was not happy with the results and have since gotten out of computer audio.

Next time I try computer audio, I'll buy a Mac Mini direct to a DAC (MHDT Paradisea or comparable) via USB. I don't think you'll be happy with a long (>15 ft) cable or wireless to an airport express) unless sound quality is not important. Suggest you invest in a Mac Mini, a good, short USB cable and a USB capable DAC.
pdreher's avatar
pdreher
1,229 posts
 
If memory serves me correctly, Steve from Empirical Audio said you don't want to exceed 15 feet of USB cable.
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