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Old 21st April 2012, 06:02 PM   #351
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Originally Posted by abraxalito View Post
Could be that they're production tested at 176k. I'm not aware of anything in that same SO28 package which locks at 176k guaranteed.
Or they are just plain deceiving...
My Denon receiver uses LC89058W-E to be capable of 192kHz.

Last edited by SoNic_real_one; 21st April 2012 at 06:08 PM.
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Old 21st April 2012, 08:21 PM   #352
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Originally Posted by SoNic_real_one View Post
Or they are just plain deceiving...
My Denon receiver uses LC89058W-E to be capable of 192kHz.
Lucky you......
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Old 22nd April 2012, 02:44 AM   #353
regal is offline regal  United States
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Originally Posted by abraxalito View Post
Could be that they're production tested at 176k. I'm not aware of anything in that same SO28 package which locks at 176k guaranteed. TI has parts which go up to 216k but they're in 48pin flat packs.
Most likely the receiver skips every other sample if the spdif lock is stable enough, so you get 176.4/2=88.2 to the DAC's in some cases.
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Old 6th October 2012, 12:45 PM   #354
jitter is offline jitter  Netherlands
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Default Update

Little update.

Somewhere buried in this thread I wrote that the Octave is a filterless DAC. This is not entirely true. Yes, it doesn't employ oversampling or digital filtering, but there is a 1st order analogue filter with 70 kHz roll off point. Cees explained to me that this is necessary to prevent oscillations in amplifiers.
(No, I still don't know for sure what DAC-IC is used, I didn't ask.)

A new model ("Hex") is being introduced that's less basic (and much pricier), but still uses the NOS conversion.
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Old 6th November 2012, 03:46 AM   #355
sidiy is offline sidiy  Canada
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Has anyone posted measurements at integer sub-multiples of 44.1kHz, like 441Hz, 1102.5Hz and so forth?...

I'm still trying to come to terms with this whole NOS concept...and I stumbled on this thread, but my question applies to any NOS_DAC.

Thx!
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Old 6th November 2012, 03:54 AM   #356
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You don't say measurements of what? Were you thinking THD perhaps? If so, why are those particular frequencies of interest? Its a special case for a multibit DAC to have to reproduce a frequency which is an integer division of the sample rate and it means only a very few of the DAC's levels get exercised - the distortion is therefore typically higher. Since real world signals aren't a sub-multiple of the sample rate this is rather academic.
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Old 6th November 2012, 06:12 AM   #357
sidiy is offline sidiy  Canada
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Yes I was thinking of THD. Let's divide 44.1k by 100.
We can all compare then a 441Hz played through a multi-bit oversampled DAC vs a NOS_DAC - of course in this exercise it should be the same type.
441Hz (A) is the free frequency of the A string of a tuned violin. Imagine the two DACs as a tuning fork - the whole orchestra follows the concertmaster's tuning (with some exceptions, bla-bla...etc).

I can only imagine the conductor's amazement when half of his players will appear inadvertently tuned at 882Hz. And the public's ...or the unsuspecting audiophile in our case.

If someone says that those musicians must be deaf to be so out of tune I would underline that this thread appears to be revolving around this point...some people can't hear.
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Old 6th November 2012, 05:12 PM   #358
sidiy is offline sidiy  Canada
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Ping...for other meridians.
In resume: my initial question relates to THD measurements at integer sub-multiples of 44.1kHz. Anyone tried it for this DAC (or any other NOS DAC)?
If so I would be grateful if someone could post a link.

Thanks!
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