[LAU] hardware - Intel CPUs

[david]

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 at ovenwerks.net> 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.

-- 
David W. Jones
gnome at hawaii.rr.com
authenticity, honesty, community
http://dancingtreefrog.com