Has anyone actually measured Elso's Asynchronous Reclocker? - diyAudio
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Old 16th March 2004, 07:52 AM   #1
pop11 is offline pop11  Canada
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Wink Has anyone actually measured Elso's Asynchronous Reclocker?

I have seen posts arguing for and against Elso's Asynchronous Reclocker (or any other Asynchronous Reclockers), but I could not find any real measurement on its effect. For e.g. how it affect the jitter value, spectrum etc.

Personally, I have tried the Asynchronous Reclocker and found it to be a small improvement for my TDA1541A, but I don't have the means to measure it

Can some kind soul enlighten me on this?
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Old 16th March 2004, 03:14 PM   #2
Pedja is offline Pedja  Serbia
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Pop11,

Since you ask about the effects and since I have not measured the same DAC (TDA1541A) without the reclocker, this graph answers the question only partially, but it clearly shows that the asynchronous reclocking which uses the frequency which is not the multiple of Fs does not result in the low jitter, it certainly raises it.


Click the image to open in full size.


For those not aware of, the thread with some info and some opinions about this issue is here:
http://www.diyaudio.com/forums/showt...390#post326390

Pedja
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Old 17th March 2004, 06:56 AM   #3
pop11 is offline pop11  Canada
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Default thanks ...

Thanks Pedja,

Should there be a couple more plots overlays on the graph? so to compare the jitter before and after?
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Old 17th March 2004, 08:45 AM   #4
Fabian is offline Fabian  Switzerland
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Default some more measurements

hi pop11,

I did some basic measurement of four different TDA1543 based DACs. Two of them have no reclocking, one has Elso's reclocking and the last one has the reclocking circuit according to Doede's DDDAC1543.
The reclocked DACs sound better than the non-reclocked (IMHO) and both reclocker as well decrease the sonic influence of the transport.
But the reclocked DACs measure worse. Elso's reclocker adds alot of jitter, Doedes reclocker will drop or repeat a sample from time to time. Click on "measurements" on http://www.geocities.com/tdac1543/ to see some screenshots of my measuremts.

Fabian
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Old 17th March 2004, 09:24 AM   #5
pop11 is offline pop11  Canada
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Exclamation I'm shocked!!!!!

Elso's reclocker has a jitter level of "10500ps" !!


but Elso's reclocker did improve the sound ... beats me ...

I wonder what will happen if we modify Elso's reclocker and bring the jitter back down to a lower value, it may be a killer!

Any idea how to reduce jitter in Elso's reclocker?
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Old 17th March 2004, 02:09 PM   #6
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Default Re: some more measurements

Quote:
Originally posted by Fabian
hi pop11,

I did some basic measurement of four different TDA1543 based DACs. Two of them have no reclocking, one has Elso's reclocking and the last one has the reclocking circuit according to Doede's DDDAC1543.
The reclocked DACs sound better than the non-reclocked (IMHO) and both reclocker as well decrease the sonic influence of the transport.
But the reclocked DACs measure worse. Elso's reclocker adds alot of jitter, Doedes reclocker will drop or repeat a sample from time to time. Click on "measurements" on http://www.geocities.com/tdac1543/ to see some screenshots of my measuremts.

Fabian
Hi

Impressive setups and thanks for sharing measurements

While the jitter is indirectly measured, the outcome still is valid for indicative use.

In my research last years it has been often shown that certain types of oscillators sound very fine, but measure worse. In contrast, oscillators with very low jitter can be very revealing.

Similarly, some people prefer certain types of of (tube) amplifiers

In the end, it just depends on what you are looking for, soundwise, that is.

best regards,
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