[LAU] RME analog out of phase to ADAT connected Behringer analog out

[Ralf Mardorf]

On Mon, 2011-06-13 at 09:14 -0400, Paul Davis wrote:
> On Sun, Jun 12, 2011 at 10:37 PM, Ralf Mardorf
> <ralf.mardorf at alice-dsl.net> wrote:
> > Hi,
> >
> > I made a sound check, that isn't a valid test, just a test to get a
> > coarse impression, but it's positive that for the 'RME analog out / ADAT
> > out test' the signals were out of phase.
> 
> I have no idea why you would expect two analog signal paths with
> independent D/A conversion would ever be in phase.

Thanks, that was what I wanted to know, so it's not broken. I didn't
expect that, I was told that when synced "NOTHING" would differ. I
claimed that I don't believe this and seemingly I didn't mistake. It's
important to be aware of this ;).

> I also have no idea how or why you are doing a test that involves
> playing a PCM file in one case and apparently playing an audio CD in a
> CD player in the other.

No valid test, just a test to hear, if at least the sound quality of a
(less good?) CD player is reached, fortunately it is reached, even with
the elCheapo Terratec, 44.1 KHz it's quasi equal for the RME, Terratec,
the CD player, when listening by the Behringer console. But when using
Totem (no jackd) the sound differs, which doesn't mean that the sound
quality is less good or better, the sound is different. Again, this
isn't a valid test, regarding to the abilities of e.g. the RME card. It
was a test to ensure that the sound quality won't get more worse, than
the worst sound quality of my home equipment. The most worse equipment I
own and use is the Pinoeer CD player and the Behringer mixing console.
The less good sound quality is at the border to what I can stand,
anything less good I can't stand. Even with best equipment I can't stand
44.1 KHz very long, for e.g. synth music, of course I'm able to listen
to old blues recordings that are terribly broken, because of the soul by
this music, but for e.g. synth music I need 48 Khz at a quality given by
Sony equipment, my Terratec sound card e.g. can't provide this sound
quality, even not at 96 KHz. I don't know why, at least I suspect the
analog op-amps as being bad.

Regards,

Ralf