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Forum Locked176,4/192 Khz inputs issue
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Caracal
Caracal


Joined: October/09/2015
Location: Paris
Points: 17 		Direct Link To This Post Topic: 176,4/192 Khz inputs issue
    Posted: December/01/2015 at 3:26am
Hi,

I've got an issue when i set the sample clock to 176,4 or 192 kHz, internal or external clock source.
I can see little modulations in the lynx cf screenshot.
Useless to say that the sound is very poor in this configuration.
Aurora works perfectly fine in sample rates up to 96 Khz.


Here is my config
Aurora 8 connected with the Lynx TL-TB optional card (build 58) to a mac 10.9.5.

Thanks again for your help.

Best,
Jeremy
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Caracal
Caracal


Joined: October/09/2015
Location: Paris
Points: 17 		Direct Link To This Post Posted: December/01/2015 at 4:07am
Sorry, I forgot to mention that it concerns the Analog inputs.

Thanks
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Mike N View Drop Down
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Joined: November/13/2008
Location: Costa Mesa, CA
Points: 2488 		Direct Link To This Post Posted: December/01/2015 at 9:22am
Hi. What size buffers are you using for the higher rates?
Michael Nicoletti
Lynx Studio Technology
Sales & Support Coordinator
714-545-4700 Ext. 211
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Caracal
Caracal


Joined: October/09/2015
Location: Paris
Points: 17 		Direct Link To This Post Posted: December/01/2015 at 9:44am
You mean in the Daw ? I tried to set it at the max but it didn t change anything.
I've got the problem even before starting any Audio application (except the Lynx Mixer).
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Mike N View Drop Down
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Points: 2488 		Direct Link To This Post Posted: December/01/2015 at 10:05am
Our meters in Lynx Mixer go down to -70dBfs. What you are seeing is normal and out of the audio band, so it is not what you are hearing; it has no affect on playback. There is some other issue, that is why I am wondering about what buffer size you are using.
Michael Nicoletti
Lynx Studio Technology
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714-545-4700 Ext. 211
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Caracal
Caracal


Joined: October/09/2015
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Points: 17 		Direct Link To This Post Posted: December/01/2015 at 10:11am
Yes I thought as much, but the meters doesn't behave this way on lower rates like at 96 Khz.
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Mike N View Drop Down
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Points: 2488 		Direct Link To This Post Posted: December/01/2015 at 12:13pm
That is true....We could have added a low pass/hi cut filter but we do not like adding anything extra in the signal path, especially since this is out of the audio band.


Edited by Mike N - December/01/2015 at 12:14pm
Michael Nicoletti
Lynx Studio Technology
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Caracal
Caracal


Joined: October/09/2015
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Points: 17 		Direct Link To This Post Posted: April/08/2016 at 9:48am
Hey Mike,

Not to mention this meter behaviour issue (wich is not my major problem), I'm still having an horrible crackled sound with these two clock rates (176.4 and 192 khz).
I'm not using 192 khz clock rate very often, i'm using rates up to 96 khz for now but i could be required to work with those kind of high rates some day and i'd like to be ok with this.

I've made some test.
I've notice that when i monitored the inputs directly through the ouputs with the lynx mixer, the sound is ok.
It crackled only when i used the audio core (like with a Daw). I've made 2 screenshots to help.

http://hpics.li/af8cc03                 OK
http://hpics.li/d7cdeae                Not OK

So it's maybe a problem with the TB expansion card right ?

Is this problem knowned ?

Thanks for your help.
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Mike N View Drop Down
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Points: 2488 		Direct Link To This Post Posted: April/08/2016 at 10:09am
Hi Jeremy,

Are you using Build 58 or 58A?

If you have 58A, download Build 58. Please first run the Uninstaller that is included in the folder, restart, install Build 58, restart, and let is us know the results.
Michael Nicoletti
Lynx Studio Technology
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714-545-4700 Ext. 211
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Caracal
Caracal


Joined: October/09/2015
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Points: 17 		Direct Link To This Post Posted: April/11/2016 at 4:00am
Hi Mike,

According to the about section in the Lynx mixer, I'm using build 58  Aug 31 2015.

Thanks.
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PaulTech View Drop Down
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Points: 5495 		Direct Link To This Post Posted: April/14/2016 at 5:00pm
In the Lynx Mixer, Click Mixer > ABout. What is the firmware revision for the LTTB? 
Paul Erlandson
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Lynx Support and Updates on Facebook!
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Caracal
Caracal


Joined: October/09/2015
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Points: 17 		Direct Link To This Post Posted: April/15/2016 at 10:04am
Hi Mike,

Here is the Whole information given by the about section in the Lynx Mixer.

*****************************************************************************
>>> PLEASE DO NOT EDIT ANY TEXT IN THIS BLOCK!
Time and Date: 15 Apr 2016 7:02:43pm
Lynx Mixer Version: 1.0 Build 58
Build Date: Aug 27 2015

Driver Version: 1.0 Build 58
Driver Date: Aug 31 2015

1: Aurora 8 Serial Number: 1414242306 Rev: A
Firmware Version: 6.0   Date: Jul 17, 2015

Aurora 8 Serial Number: 2714272139 Rev: B
Aurora 8 Firmware Version: 28

(E0/C0/S88) Temperature 57ºC/134ºF

Operating system: Mac OSX 10.9.5
User region:      FR
User language:    fr
Display language: fr
Is 64-bit:        Yes
Number of CPUs:   8
Memory size:      16384 MB
CPU vendor:       GenuineIntel
CPU speed:        3700 MHz

Current executable file: /Applications/Lynx Mixer.app/Contents/MacOS/Lynx Mixer
>>> PLEASE DO NOT EDIT ANY TEXT IN THIS BLOCK!
*****************************************************************************
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Mike N View Drop Down
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Joined: November/13/2008
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Points: 2488 		Direct Link To This Post Posted: April/15/2016 at 10:44am
Hi,

Please install this Firmware onto the LT-TB and let us know the results.
Michael Nicoletti
Lynx Studio Technology
Sales & Support Coordinator
714-545-4700 Ext. 211
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Caracal
Caracal


Joined: October/09/2015
Location: Paris
Points: 17 		Direct Link To This Post Posted: April/20/2016 at 7:28am
Hi Mike,

I did the firmware downgrade but the Aurora didn't work anymore.
I tried to install to latest version again but it now ask to change prom1 or something.

We won't come out of this easilly :)

Any idea ?

Thanks
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Mike N View Drop Down
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Points: 2488 		Direct Link To This Post Posted: April/20/2016 at 11:45am
Hi,

Sorry things are not happening smoothly.

Please unplug the AC from Aurora, remove the top panel and, on the LT-TB card, move Dip Switch 3 (PROM 1) to ON and Dip Switch 4 (PROM 2) to OFF. Plug Aurora in and power it up (for your safety place the top lid back onto Aurora but do not replace the screws yet), reprogram the card, then unplug Aurora, reverse the Dip switches again, plug in the AC, power up Aurora and let us know the results.





Edited by Mike N - April/20/2016 at 4:23pm
Michael Nicoletti
Lynx Studio Technology
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Caracal
Caracal


Joined: October/09/2015
Location: Paris
Points: 17 		Direct Link To This Post Posted: April/22/2016 at 7:56am
Hey,

Did all the change and get back to FW v6.0.
It's back in business.

But unfortunately, I still the the scratchy in 192Khz.
I'm starting thinking it could be a hardware problem...
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Mike N View Drop Down
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Points: 2488 		Direct Link To This Post Posted: April/22/2016 at 10:24am
That should have installed 5.5....Did you switch it back to PROM 2?
Michael Nicoletti
Lynx Studio Technology
Sales & Support Coordinator
714-545-4700 Ext. 211
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Caracal
Caracal


Joined: October/09/2015
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Points: 17 		Direct Link To This Post Posted: May/12/2016 at 1:26am
Hey Mike,

Yes i did.
Do you think i should try with the 5.5 ?
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