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In Reply to: RE: JPlay - Do you have to have a DAC posted by JeffH on April 02, 2015 at 08:07:41
"I think some people misunderstood. PC clock is still used and required to run PC, Windows and all other tasks, but JPLAY no longer relies on it. How we've done it is our secret."My current system doesn't rely upon it either because my DAC also re-clocks. So I suppose the "secret" is that JPlay is relying on the DAC to re-clock. Is there something special about this? Does JPlay create a special relationship with the DAC that other software can't?
I fully understand that the proof is in the hearing, but there is nothing wrong with trying to understand a process or for that matter a marketing campaign. And FWIW, I would like for JPlay to sound the best, then I would like some other company to get motivated and create something even better...ad infinitum.
Edits: 04/04/15 04/04/15 04/05/15 04/05/15 04/05/15Follow Ups:
Whether or not the DAC reclocks, the computer clock and logic run by the computer clock will still contribute noise that may travel along the USB cable and power wiring and make it to critical circuitry in the DAC.
You can hear this noise on an AM radio, even one that's battery powered. Just being near to the computer will suffice. There is no need for an amp or speakers to be connected to the DAC. What you hear on the radio will depend on the software running in the computer, buffer settings, etc.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
I've done the AM radio test and hear nothing. My DAC isolates very well.
But still the question remains: How does JPlay implement their secret technology?
An abriviated quote from computer audiophile review:
"The QB-9 DSD may have the best all around USB implementation of any DAC I've ever used...To date this is the most stable and best performing USB solution I've used. Second, the QB-9 DSD uses its own clean power supply for the USB input...Combined these factors eliminated any need for power related tweaks to my computers during this review period. I keep about a dozen computers around here for testing with different software and hardware. One of these PCs emits so much electrical noise through its USB port that I can't use it with just any DAC. This PC is the ultimate test of USB isolation. Connected to most DACs I can easily hear all kinds of garbage as if five refrigerators were sharing the same power outlet with my audio system. However, when I connect this electrically noisy computer to the QB-9 DSD I hear silence through the speakers..."
It sounds like your AM radio is rather insensitive or has been tuned to a strong station. Try tuning it to an unused frequency that is far on the dial from any strong local station and listen to the background noise with the computer powered down, powered up but idle and running various software. If you want to test the audio software and your DAC you can have it play music, provided the amp is turned off so noise from the speakers doesn't interfere with hearing the radio.
You are fortunate to have a DAC with good isolation. Others are less so. If you don't hear difference between bit perfect player software or computer tweaks, consider yourself lucky. And yes, there should be silence out of the speakers when playing silent portions of digital tracks. I can't imagine tolerating a DAC or amplifiers where this was not the case. Ditto for any other kind of noise such as hum or buzz. Note that electrical noise from the computers doesn't just add to the music, it also interacts with the music, thereby adding distortion.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Back to the original subject, any idea how the JPlay secret DAC link works?
nt
you can surely find an unused frequency with that puppy!
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