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Old 7th June 2011, 12:28 AM   #3041
Pano is offline Pano  United States
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I honestly can't see the need for higher than 96KHz for playback, but some folks might.
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Old 7th June 2011, 12:36 AM   #3042
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Quote:
Originally Posted by Pano View Post
I honestly can't see the need for higher than 96KHz for playback, but some folks might.
This is perhaps true for me also. I purchase FLAC content 'studio masters', mastered in 24/96 and they sound amazingly good!

The only reason I was enquiring about 192KHz, is because now, increaslingly you can select 24/192 when purchasing content,, so my concern was about 'future proofing' my music collection..

But anyway, I am happy now with knowledge that everything is converted to 96K for processing by the DSP..

Ta
CM
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Old 22nd July 2011, 08:58 PM   #3043
oettle is offline oettle  Germany
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Originally Posted by MurphyUHF10 View Post
Thanks guys for your feedback..

Thanks for sample file,, I will try tonight.

Yes, my question was that the DSP converted everything to 96KHz,, tha'ts why I wonder if sticking to 24/96 music files might be best option as anything else is just up/down converted to 96KHz anyway..

I did some research and found the Oettle clock is limited to 178KHz.

Cheers..
CM

Hi all,

1. The internal data rate of the DCX is always 96 kHz independent of digital data input. So if you use 192 kHz sample rate the sample rate converter (SRC) of my SRC/clock mod would down sample your data stream to 96 kHz.
Typical CDs or MP3 files use a 44.1 kHz sample rate. It does not make sense to up sample this date to 192 kHz. Sound quality is not getting better but worse because of the additional and unnecessary up sampling which adds distortion.
So itís recommended to use the sample rate of the data source (e.g. 44.1 kHz for CD) and not to up sample data to avoid unnecessary sample rate conversion.

2. The SRC/clock mod is not only an improved sample rate converter (SRC) but an ultra low jitter clock too, which replaces the internal 24.576 MHz high jitter clock of the DCX built with a simple crystal.

3. The SRC/clock mod replaces the erroneous (dull sound) CS8420 chip. It needs one additional wire (+8-9V) for the two on board ultra low noise and high PSRR power supplies. These supplies are used for the improved PLL and sample rate converter and for the ultra low jitter clock oscillator.

The improvement of the SCR/clock mod was measured by Ergo: http://www.pilghamaudio.com/uploads/PDFs/Jitter.pdf
The diagram shows much better performance compared to the original DCX.

Please also have a look at the attached table which shows the different available mods for the DCX.

Good luck
Attached Files
File Type: doc DCX table.doc (150.5 KB, 74 views)
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Old 23rd July 2011, 12:11 AM   #3044
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Quote:
Originally Posted by oettle View Post
The diagram shows much better performance compared to the original DCX.
Still dubious audibility.
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Old 23rd July 2011, 08:43 AM   #3045
oettle is offline oettle  Germany
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Have you experience with the mod or is it a dubious comment only?

The measurement shows beside an improved noise floor much better frequency stability.
The result is a more precise stereo image. I could hear the difference clearly and meanwhile a lot of other users too.
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Old 23rd July 2011, 08:50 AM   #3046
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Based upon the measurements you referenced. The noise floor is very low in both cases and 'more precise stereo image' means whatever the listener wants, especially with a large does of Beraneks Law thrown in.
I also have no interest in sales of parts.
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Old 23rd July 2011, 09:48 AM   #3047
oettle is offline oettle  Germany
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OK, you have no experience with the mod.

The measurement http://www.pilghamaudio.com/uploads/PDFs/Jitter.pdf not only shows a better noise floor.
With the original DCX clock the 12 kHz test input spreads up to some extend to a frequency spectrum between 11 and 13 kHz (yellow line). With the low jitter clock mod you get a clear 12 kHz output only (green line). That makes the more precise sound.
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Old 23rd July 2011, 10:04 AM   #3048
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Quote:
Originally Posted by oettle View Post
OK, you have no experience with the mod.
Irrelevant.

Quote:
Originally Posted by oettle View Post
The measurement http://www.pilghamaudio.com/uploads/PDFs/Jitter.pdf not only shows a better noise floor.
With the original DCX clock the 12 kHz test input spreads up to some extend to a frequency spectrum between 11 and 13 kHz (yellow line). With the low jitter clock mod you get a clear 12 kHz output only (green line). That makes the more precise sound.
It is still under audibility thresholds for every jitter test I have seen, eg Dunn, so simply saying it is better because of a small difference >100dB down is no proof of anything. Might as well be homeopathy.

Last edited by Brett; 23rd July 2011 at 10:09 AM.
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Old 23rd July 2011, 10:12 AM   #3049
oettle is offline oettle  Germany
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Originally Posted by Brett View Post
Irrelevant.
You are right!
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Old 23rd July 2011, 10:19 AM   #3050
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Quote:
Originally Posted by oettle View Post
You are right!
Good to hear that you agree that that is the value of that mod.
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