Quote:Originally Posted by a santos
I was considering, http://www.ap-linux.com
but according to some on computeraudiophile.com, they appear to suggest linux doesn't have the under-the-hood nots and bolts for audiophile sound
Thanks for the complement, but...
Quote:Employing a modified Linux OS optimized to provide the highest quality audio performance,
No, the fact Bryston uses a "modified" Linux doesn't mean an off the shelf distro like Xubuntu or Ubuntu Studio wouldn't/couldn't produce the exact same bitstream and jitter magnitude from it's SPDIF, HDMI, or USB outputs.
The volume of illogic and snake oilsmanship in the audiophile hobby is staggering, second only to finance/investment types.
As the prior post responded, once the claim is made and demonstrated (use a DTS encoded red book CD or WAV file) that bit perfect output is achieved (again, through an SPDIF or USB output from any device, PC or custom), by definition there is NO difference in the datastream (i.e. bytes at receivng device). There *may* be differences in jitter magnitude on the output, which may or may not matter depending on the receiving device (DAC, processor, etc):
Quote:there have been properly conducted listening tests to determine the audibility of jitter. Two obvious examples are:
Benjamin & Gannon.
Theoretical and audible effects of jitter on digital audio quality.
105th AES Convention, 1998
Jitter added to digital signal between transport and DAC with a hardware device.
Conclusions: uncorrelated jitter inaudible below 10nS rms on pure tones;
uncorrelated jitter inaudible below 20nS rms on music signal
Ashihara, Kiryu et al.
Detection threshold for distortions due to jitter on digital audio.
Acoust. Sci. & Tech. 26, 1 (2005)
Jitter simulated in the digital domain.
Conclusions: uncorrelated jitter inaudible below 250nS on music signal.
"Notice how *massive* are the levels of jitter that proved to be inaudible, and compare that to jitter levels in modern systems (typically below 1nS, good ones below 100pS). Jitter simply isn't the bogeyman it's made out to be."
So what- get a better *receiving* device or use the USB out from your linux PC to an async USB DAC.
Another rebuttal is the fact that commercial OS's like OSX (Mac) and Windows must apply DRM schemes to audio and video paths, tainting the audio stream. By definition, FOSS OS's don't, so you can be guaranteed of an untainted audio bitstream *Only* from FOSS OS's.
Yes, we all know about Windows kernel streaming and ASIO and third party add ons for Mac OSX iTunes that claim
to leave the audio datastream unmolested & "bit perfect". But why do you want to use third party *proprietary* (i.e. non free-speech) workarounds and hacks to give you back what you have rights
to in the FIRST PLACE
!? Plus, audiophiles are OCD by definition, and you would *never* know if a commercial OS (Win/Mac) is tainting the audio stream for sure, third party plug-ins/add-ons/drivers or not. With common FOSS OS's (Ubuntu and compatible derivatives, Fedora and derivatives, Arch and derivatives, etc), you *know* the audio bits are untainted.