Re: Changing the way the OS responds to a USB DAC
Re: Changing the way the OS responds to a USB DAC
- Subject: Re: Changing the way the OS responds to a USB DAC
- From: SB Tech <email@hidden>
- Date: Sat, 03 Mar 2012 17:46:20 +0000
Please appreciate my bluntness when I say: your response was, I'm afraid, so full of apparent misunderstandings, misreadings and misinformation that it's close to useless.
On 3 March 2012 01:18, Brian Willoughby
<email@hidden> wrote:
You are barking up the wrong tree. If you want the volume to be "disabled" then you need to insure - as the user and operator - that the volume is set to 0 dB.
I think this is the root of the problem: you claim I want the "volume to be "disabled"", but what I actually asked is for the _volume controls_ to be disabled.
I was going to respond with an annotated copy of your response indicating what I perceived to be the many errors in your understanding, but perhaps it's easier to simply outline my understanding of the digital audio output process, indicate what I perceive as an undesired response by the OS to my digital audio setup, and go from there. I'm fully willing to accept that my misunderstanding of the DAC process is causing confusion and misapprehensions.
In brief: ALAC file is unpacked to LPCM by iTunes, which sends the resultant data via the USB port to the attached DAC, which converts it to analogue audio and sends it to the amp, and thence to the output (headphones or speakers).
As far as I understand it, the OS's volume setting has nothing to do with the data that's sent to the DAC, which is why in the case of the optical digital out the controls are all disabled. Perhaps iTunes' volume control modifies the output, but that doesn't surprise me, which is why I've long listened to the advice that states you should always keep iTunes volume control at maximum.
So, is the error in understanding mine, yours or a bit of both? :)
S.
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