14 Jun
2011
14 Jun
'11
2:31 p.m.
On Tue, 2011-06-14 at 07:22 -0400, Paul Davis wrote:
no, you did make a mistake. your test (to the extent
that i understand
it) didn't sync anything. you used two different D/A converters
without a common word clock. even with the same word clock, they would
not necessarily be synced because they may buffer different number of
samples internally in front of the actual D/A circuitry. but this is
sort of irrelevant because you didn't actually sync anything together
at all as far as i could tell.
I only used ADAT to sync. I guess when doing this I don't need to use
wordclock by BNC.
RME card ADAT master --> Behringer ADAT device slave
Then I listened to the Behringer analog outs and the RME's analog outs.
I set up the Behringer by a switch and the RME card by alsamixer. Any
alsamixer setting caused the same result. I didn't set the Behringer to
anything other than ADAT slave.
first of all, CD players don't do direct digital
audio playback. the
audio you get telling the disc to play an audio CD is different than
you get when reading it as a digital storage medium. secondly, you
appear to have made the cardinal error of trying to do psycho-acoustic
testing without using even blind, let alone double blind testing. this
means that your assessment is meaniningless. if you don't believe me,
try watching (at least the first 2 speakers) of this:
Full ACK, this test is just to hear if there are really audible
differences I should be aware. Differences that are that audible, that
no blind test is needed.
There were not such differences, excepted for Totem and this RME to
Behringer phasing issue.
Without a blind test nobody should doubt that there is a difference
between the audio quality of a telephone handset and a good studio
monitor ;).
please note that i did not that say that your
assessment is *wrong*.
but the way you did it is. your conclusion about sound quality might
be right, but its equally likely to be wrong.
Again full ACK!
Regards,
Ralf