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Author Topic: ODAC Measurements  (Read 13948 times)

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firev1

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Re: ODAC Measurements
« Reply #20 on: March 13, 2014, 02:02:50 PM »
Bump, for measurements from the SB1240. Did this mostly as a verification(or calibration) to known measurements. Jitter for production units can be very low, which was what Nwavguy said. Got measurements close to what he posted on his site.

Challenges were getting the unit to lock onto differing sample rates correctly, a pain in the arse which results in huge amounts of jitter, reseting it by plugging in and out seems to be the only workaround, perhaps better power will do the trick?

Note, 10khz spike is a measurement artifact.

« Last Edit: March 13, 2014, 10:39:08 PM by firev1 »
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Armaegis

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Re: ODAC Measurements
« Reply #21 on: March 14, 2014, 12:46:49 AM »
Quote from: ihasmario on December 20, 2012, 05:46:00 AM
Instead of actual research taking place, we've moved from one parrot to another and both are equally as dangerous as eachother. But now instead of products and music being the idea, we've now got a figurehead. It's like that terrible shift rock and trance music took, where they started being about the musicians/act/spectacle as much as or more than the music.  :vomit:

My beef with him was that he basically built his "legacy" by stomping on the backs of others. Perhaps it was some calculated move to generate site traffic and fame, but watching his behaviour and bully tactics make me not want to support him in any way whatsoever. Which is too bad because I do feel he has made important contributions to the hobby.
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Chris1967

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Re: ODAC Measurements
« Reply #22 on: March 17, 2014, 10:15:18 AM »
Quote from: firev1 on March 13, 2014, 02:02:50 PM
Bump, for measurements from the SB1240. Did this mostly as a verification(or calibration) to known measurements. Jitter for production units can be very low, which was what Nwavguy said. Got measurements close to what he posted on his site.

Challenges were getting the unit to lock onto differing sample rates correctly, a pain in the arse which results in huge amounts of jitter, reseting it by plugging in and out seems to be the only workaround, perhaps better power will do the trick?

Note, 10khz spike is a measurement artifact.



I haven't any measurements, but from a purely subjective impression, the ODAC has definitely improved with the addition of Salas shunt in my case, better detail and dynamics, and also with AMB σ11, and USB isolation.

I have experienced the problem before and it needed as you say unplug and plug again... now with the power supply it is not necessary.

http://www.changstar.com/index.php/topic,383.24.html

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funkmeister

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Re: ODAC Measurements
« Reply #23 on: March 17, 2014, 05:00:58 PM »
So... is there an easy DIY guide to frankenDAC this thing? Your proposed mods sounds interesting to me. I'm not afriad to solder stuff but I need to follow detailed instructions.
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fishski13

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Re: ODAC Measurements
« Reply #24 on: March 17, 2014, 05:31:25 PM »
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firev1

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Re: ODAC Measurements
« Reply #25 on: March 18, 2014, 12:14:54 AM »
Dropped the dac ideas for a while for the amp stuff,  I would love to get to that when I have more dough and time for it...
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Chris1967

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Re: ODAC Measurements
« Reply #26 on: March 18, 2014, 07:43:21 AM »
Quote from: fishski13 on March 17, 2014, 05:31:25 PM
this: http://www.head-fi.org/t/703334/doodlebug-usb-isolator

Nice!! pity only full speed... it would be a killer if it could handle hi-res (over 24/96) material... nebertheless excellent choice to be paired with an ODAC...
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funkmeister

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Re: ODAC Measurements
« Reply #27 on: March 21, 2014, 05:38:32 PM »
Quote from: Chris1967 on March 18, 2014, 07:43:21 AM
Quote from: fishski13 on March 17, 2014, 05:31:25 PM
this: http://www.head-fi.org/t/703334/doodlebug-usb-isolator

Nice!! pity only full speed... it would be a killer if it could handle hi-res (over 24/96) material... nevertheless excellent choice to be paired with an ODAC...

I consider 24/96 Hi-Rez.
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Chris1967

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Re: ODAC Measurements
« Reply #28 on: March 21, 2014, 06:43:21 PM »
It most certainly is, but in my experience these isolators, might not perform at their best at 24/96...(artifacts/dropouts/clicks etc...).

The will perform very well at 16/44.

It remains to be seen if people are happy with it, at that resolution.

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firev1

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Re: ODAC Measurements
« Reply #29 on: April 25, 2014, 04:30:05 PM »
Measurement taken with a chinese ADUM4160 isolation board in full speed mode with the Teradak U9 PSU(will be replaced by a Sigma 11 sometime). Top is with isolation and bottom without. As you can see, isolation does add some jitter but its miniscule after reclocking by the Tenor's PLL.



Added 27/04/14 Real world test for the ODAC(which is how I would imagine most users will use the ODAC in), the Win8 laptop may be your home desktop which I imagine is what most users would use. Really want a Doodlebug sometime in kit form :3

Edit 191014: Putting in best case measurements for ODAC with and without the wyrd at the bottom. These are made with the 0404 and a true 24 bit Jtest file. ODAC is playback thru FB2k with Wasapi and ram buffering while recording is done using the 0404usb in ASIO at 24/48khz


« Last Edit: October 19, 2014, 07:47:15 AM by firev1 »
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