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Author Topic: Sound Devices USBPre 2  (Read 163184 times)

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Offline page

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Re: Sound Devices USBPre 2
« Reply #315 on: March 22, 2011, 09:32:56 AM »
Yes, I can help.

Is it the same flac file dropping the audio? You said for about half a second so that means it instantly comes back and continues to play? So far has this only occurred once per play or if you leave it on longer than 10 minutes looping a number of flacs it occurs again?

Any flac file will do it in my experience (sendspace link), and it is program/playback indescriminate. I just have a file I've constructed (tone and pulse) to make it easier to visually verify without listening when it occurs. It only occurs when using the USB playback (and affects all outputs). I've tried feeding it an optical signal with great success, so it's something related to the USB signal.


The original email I sent to SD:

occasionally (with no consistency of frequency) when
playing back audio to the usbpre2, I experience a momentary dropout of
sound, approximately 1/8 to 1/4th of a second in duration.

Firmware: 1.01
Operating System; OSX, 10.5.8
Operation; playback over usb (has not occurred over optical, no way to
test SPDIF on this machine)
Powering: Does not lose power (metering decays appropriately during
dropout and resumes when signal is returned.)
Buffer: I've increased the buffer on my playback program from 2000ms
to 4000 and then 10000ms with no improvement. Frequency or consistency
of occurrence does not change (both are still at random).

Occurs when running nothing else after rebooting and when running all
sorts of stuff. I have a USB hard drive attached, a usb keyboard,
mouse, and the usbpre2. I've tried inducing load on the hard drive,
keyboard and mouse all simultaneously (to proverbially "starve" the
usbpre2 due to traffic over usb) to no avail. I can occur as
frequently as once every 3 minutes or as infrequently as once every
couple of hours. Do you have any tips on trying recreate it with
consistency or to isolate whether it's the usb data traffic, the usb
power (although unlikely due to the decay demonstrated), or something
else?


edit: added sendspace link.
« Last Edit: March 22, 2011, 08:22:30 PM by page »
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Offline rastasean

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Re: Sound Devices USBPre 2
« Reply #316 on: April 15, 2011, 02:37:24 PM »

Operating system & usbpre2 information

mac os x 10.5.8
Model Identifier:   MacBook4,1
firmware on usbpre2: 1..01

USB High-Speed Bus
  Host Controller Location:   Built In USB
  Host Controller Driver:   AppleUSBEHCI
  PCI Device ID:   0x2836
  PCI Revision ID:   0x0003
  PCI Vendor ID:   0x8086
  Bus Number:   0xfd

Software used
VLC media player Version 1.0.5 Goldeneye (PowerPC 32bit)



Results
Unable to reproduce the reported issue using the above listed hardware and firmware. Audio file was played several consecutive times and after a few small breaks, but the initial issue was unable to be reproduced. Audio was not monitored through headphones or speakers, only visual indication of the meters proved that the audio was playing from the computer to the usbpre2. Tests conducted with and without AC power from power supply.

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Re: Sound Devices USBPre 2
« Reply #317 on: April 15, 2011, 03:18:27 PM »

Operating system & usbpre2 information

mac os x 10.5.8
Model Identifier:   MacBook4,1
firmware on usbpre2: 1..01

USB High-Speed Bus
  Host Controller Location:   Built In USB
  Host Controller Driver:   AppleUSBEHCI
  PCI Device ID:   0x2836
  PCI Revision ID:   0x0003
  PCI Vendor ID:   0x8086
  Bus Number:   0xfd

Software used
VLC media player Version 1.0.5 Goldeneye (PowerPC 32bit)



Results
Unable to reproduce the reported issue using the above listed hardware and firmware. Audio file was played several consecutive times and after a few small breaks, but the initial issue was unable to be reproduced. Audio was not monitored through headphones or speakers, only visual indication of the meters proved that the audio was playing from the computer to the usbpre2. Tests conducted with and without AC power from power supply.


Thanks for the bump. I've found I can set it on repeat in Audacity and it won't drop a signal when it repeats (it actually sounds seamless). I've narrowed it down to occuring between 3 and 6 minutes, about every 4 minutes.

They wonder if it's related to my specific unit.
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

Offline rastasean

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Re: Sound Devices USBPre 2
« Reply #318 on: April 15, 2011, 11:30:35 PM »
Weird. Did sound devices offer any solutions?
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Re: Sound Devices USBPre 2
« Reply #319 on: April 15, 2011, 11:32:45 PM »
Weird. Did sound devices offer any solutions?

not yet. still thinking. They are debating having me send it to them for tests.
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

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Re: Sound Devices USBPre 2
« Reply #320 on: April 17, 2011, 11:01:07 PM »
Weird. Did sound devices offer any solutions?

not yet. still thinking. They are debating having me send it to them for tests.

Page, why do you have BOTH a 722 AND a USBPre2 ??? Since SD said they have exactly the same Pre/ADC....
Schoeps MK 4V & MK 41V ->
Schoeps 250|0 KCY's (x2) ->
Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
http://www.mediafire.com/folder/j9eu80jpuaubz/Recordings

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Re: Sound Devices USBPre 2
« Reply #321 on: April 17, 2011, 11:09:55 PM »
Weird. Did sound devices offer any solutions?

not yet. still thinking. They are debating having me send it to them for tests.

Page, why do you have BOTH a 722 AND a USBPre2 ??? Since SD said they have exactly the same Pre/ADC....

picked up the pre2 to link to the 722 and run 4ch. For example, I can run them in different places like at different stages at a festival, or run 1 off of the sbd and the other further FOB and resync in post. Traded in my grace 901 and used the cash to pick up the pre2 which I use as a headphone amp in the interim, thus, 2 free channels plus like $350 for the Sony D50.
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

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Re: Sound Devices USBPre 2
« Reply #322 on: April 17, 2011, 11:48:19 PM »
Weird. Did sound devices offer any solutions?

not yet. still thinking. They are debating having me send it to them for tests.

Page, why do you have BOTH a 722 AND a USBPre2 ??? Since SD said they have exactly the same Pre/ADC....

picked up the pre2 to link to the 722 and run 4ch. For example, I can run them in different places like at different stages at a festival, or run 1 off of the sbd and the other further FOB and resync in post. Traded in my grace 901 and used the cash to pick up the pre2 which I use as a headphone amp in the interim, thus, 2 free channels plus like $350 for the Sony D50.

Oh, nice! Well, that makes more sense now :)
Schoeps MK 4V & MK 41V ->
Schoeps 250|0 KCY's (x2) ->
Naiant +60v|Low Noise PFA's (x2) ->
DarkTrain Right Angle Stubby XLR's (x3) ->
Sound Devices MixPre-6 & MixPre-3

http://www.archive.org/bookmarks/diskobean
http://www.archive.org/bookmarks/Bean420
http://bt.etree.org/mytorrents.php
http://www.mediafire.com/folder/j9eu80jpuaubz/Recordings

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Re: Sound Devices USBPre 2
« Reply #323 on: May 05, 2011, 05:37:18 PM »
So I saw on gearslutz that the Pre-2 has a DC offset issue that SD is working on fixing.  I'll try to post a link later.

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Re: Sound Devices USBPre 2
« Reply #324 on: May 05, 2011, 11:58:38 PM »
So I saw on gearslutz that the Pre-2 has a DC offset issue that SD is working on fixing.  I'll try to post a link later.

input only?

got a link?
"This is a common practice we have on the bus; debating facts that we could easily find through printed material. It's like, how far is it today? I think it's four hours, and someone else comes in at 11 hours, and well, then we'll... just... talk about it..." - Jeb Puryear

"Nostalgia ain't what it used to be." - Jim Williams

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Re: Sound Devices USBPre 2
« Reply #325 on: May 06, 2011, 09:39:37 AM »
thanx Jon

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Re: Sound Devices USBPre 2
« Reply #326 on: May 09, 2011, 03:14:04 PM »
Sound Devices, LLC Support

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Re: Sound Devices USBPre 2
« Reply #327 on: May 19, 2011, 11:45:47 AM »
Has anyone upgraded the firmware on their unit? any issues?
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Re: Sound Devices USBPre 2
« Reply #328 on: May 19, 2011, 11:59:16 AM »
I have upgraded to 1.03 and have had no issues.  Of course, I've been using the new version for less than a week.

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Re: Sound Devices USBPre 2
« Reply #329 on: May 19, 2011, 12:00:12 PM »
did the update and ran it the other night.   everything seemed just fine.  Ran mics in w/pads on, @ 24/48 digi coax out to DR-680

 

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