On 04/17/2014 12:13 AM, Gene Heskett wrote:
On Thursday 17 April 2014 06:09:56 david did opine:
On 04/16/2014 02:54 AM, Gene Heskett wrote:
On Wednesday 16 April 2014 08:44:15 david did opine:
On 04/15/2014 03:17 AM, Len Ovens wrote:
On Tue, 15 Apr 2014, James Mckernon wrote:
On Mon, Apr 14, 2014 at 2:06 AM, Len Ovens <len@xxxxxxxxxxxxx>
wrote:
I would realy like to stay away from having to use a USB or
FW audio IF. In fact I would like to be able to continue to
use my delta 66 for as long as I can before I spend more
money :) The
Thanks for the useful info in your post. Just to be clear on this
part: are
you saying you don't want to switch to USB/FW solely because you
want to keep using your delta 66, or because you have some
definite preference for
PCIe over USB/FW devices? If the latter, I wonder why?
USB in audio is limited. Getting clear USB ports interrupt wise is
not easy. Audio can not be on a hub or share it's usb with anything
else, but many new MB have no mouse or kb port so the USB is
already being used for that much. The real reason though, is
latency. With the pci the latency can be 1/4 what it can be in USB
or FW. That is the lowest seeting jack for USB or FW is 64/2, but I
can run the d66 at 16/2 with no problem on a well tuned system.
This does make a difference for live work. I know that 64/2 seems
like very good latency (it is) but remember that the card then adds
another ms in each direction as well as the stage distances on top
of that. That is the time it takes the sound to reach my ear after
going through the computer as a processor and then through the air
to my ear. Maybe that is still not worth worrying about... but even
with 30 feet of cord and no digital delay, I can hear the delay
from my playing to the sound reaching my ear.
Interesting. What is the difference between speed of sound in air and
the speed of electricity through a cable?
Sound is nominally 720 miles per hour. Rather leisurely IOW.
A perfect cable is C speed, 258 times faster. But cable (coaxial)
actually range in speeds between 66% of C for home usable cables, to
around 98% of C for 9" diameter high power broadcast stuff, C being
186,272 miles per second in a vacuum. Thats 298,035.2 kilometers per
second for the metric folks here.
Then running your sound from stage to backhouse sound board back to
stage and hearing it through headphones would give no latency at all.
For an analogue board, small fraction of a millisecond, for a digital
board, anybodies guess. A/D and D/A's are essentially pretty quick, but I'd
still put most digital boards above a millisecond.
That's interesting. We're looking into replacing the analog board with a
digital one.
--
David W. Jones
gnome@xxxxxxxxxxxxx
authenticity, honesty, community
http://dancingtreefrog.com
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