Re: Complex Play Thru app fails
Re: Complex Play Thru app fails
- Subject: Re: Complex Play Thru app fails
- From: Brian Willoughby <email@hidden>
- Date: Mon, 31 Jan 2005 18:01:46 -0800
[ On Jan 31, 2005, at 10:40 AM, Doug Wyatt wrote:
[ > Are your SoundSticks connected via a USB hub, including one in the
[ > back of a monitor or a keyboard?
[ >
[ > Recently I came across a Knowledge Base article that said (if I
[ > remember it correctly) that that is not a reliable configuration; they
[ > should be connected directly to one of the CPU's USB ports.
[
[ From: Shawn Erickson <email@hidden>
[ I have had them attached to either the ports on the tower or on the
[ back of the monitor at different times in the past. It does happen more
[ often when attached to a port other then one on the tower but I did
[ have it happen when connected to the tower at least a few times (in 3+
[ years of use).
Audio problems can happen even when connecting directly to the CPU. This is
true at least on my Dual 800 QuickSilver.
I noticed a problem with my Emagic emi2|6 and eventually tracked it down to
which USB port I used on the back. This CPU has a stacked USB port with 2
connectors. The one closest to the motherboard performs poorly with audio
under very rare situations, and I initially favored using it because it is
labelled "1." I am now in the habit of plugging critical audio into USB "2"
and I have never had audio problems using that port.
I seem to recall that the Apple System Profiler showed a hierarchy of USB bus
and USB hubs that changed according to where I plugged in my audio card.
I just checked now as I composed this message, and the Apple seems to
dynamically move the hub in my Cinema Display between USB Bus 0 and USB Bus 1
according to which one is free. But, if you're using both ports, the audio
sometimes ends up sharing a Bus with the Monitor Hub (although it appears to be
upstream of the Hub, at least), and which port loses this contest seems almost
random. I guess not many folks have multiple USB Audio Devices, or we would
hear about this more often.
You might want to check Apple System Profiler on your machine, too. I think
you have to plug something into each port before the graph will show how things
get juggled around. Apple System Profiler doesn't have an update that I could
find, so make sure to quit and restart each time you plug or unplug to see the
new USB arrangement.
Brian Willoughby
Sound Consulting
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