New clock for my Marantz CD 67 mkII OSE: results - diyAudio
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Old 26th September 2007, 09:09 AM   #1
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Default New clock for my Marantz CD 67 mkII OSE: results

Hi Everybody,

I have installed a low jitter clock from TentLabs (http://www.tentlabs.com/Products/cdu...xo3/index.html) powered by a "Sjöström Super Regulator" (http://sjostromaudio.com/joomla/inde...d=55&Itemid=27) into my new Marantz CD 67 mkII OSE. The player suddenly began to play real stereo, with incredible detailes to be heard. The improvement is obvious, even guests of mine, who know nothing about electronics, confirmed that it sounds better.

I have made some measurements of the player characteristics before and after installing the new clock, using RightMark Audio Analyzer (http://audio.rightmark.org/index_new.shtml).

The original player:

http://www.sinigersky.com/docs/Maran...mkII%20OSE.htm

The player with a TentLabs XO:

http://www.sinigersky.com/docs/Maran...0reclocked.htm

For these measurements, a M-AUDIO Audiophile USB sound card has been used. For reference, here is the card only:

http://www.sinigersky.com/docs/Audio...0Out%201_2.htm

When looking at the results one can see a worse frequency response after installing the clock, and also slightly larger distorsion and somehow, more hum is now entering the system (100 Hz etc. spikes everywhere).

My theory about the frequency response is that now there is less jitter content in the high range. Would it be a good idea to modify the analog filter at the DAC output in order to compensate this?

I would be glad to read some comments on the results. Has anybody done similar tests?

I will post some pictures of the modification later.
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Old 27th September 2007, 07:03 AM   #2
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Here are some pictures:

http://www.sinigersky.com/images/Mar...67-Clock-1.jpg

http://www.sinigersky.com/images/Mar...67-Clock-2.jpg

The small box was used to reduce RFI.
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Old 27th September 2007, 08:16 AM   #3
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Obviously you have created a ground loop as your clock supply is grounded and the coax of your clock output too.
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Old 27th September 2007, 08:27 AM   #4
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Hmmm.... so what? This is no audio frequency signal!

What would you suggest?
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