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Old 23rd November 2012, 10:14 PM   #101
Coris is offline Coris  Norway
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Originally Posted by ktm15 View Post
Many thanks Coris, could you please send me the frequency of the clock on the Mediatek processor?
Unfortunately this it will take a little more time (in my case)... I`m those days in a moving process...
I`ve got 105 today, and just open it and took some pictures. To come to that 25Mhz oscillator on the mother board, one have to remove the stereo board. I just had not the time and conditions to do this right now...
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Old 25th November 2012, 05:39 AM   #102
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Thanks Coris. Looking forward to your findings.
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Old 27th November 2012, 08:49 AM   #103
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Originally Posted by Coris View Post
Unfortunately this it will take a little more time (in my case)... I`m those days in a moving process...
I`ve got 105 today, and just open it and took some pictures. To come to that 25Mhz oscillator on the mother board, one have to remove the stereo board. I just had not the time and conditions to do this right now...

Thanks Coris, so I also confirm that the new Oppo 103/105 is the oscillator frequency of 25.000 MHz? I have to order it to Dexa and do not want to miss the order ..
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Old 28th November 2012, 10:56 PM   #104
Coris is offline Coris  Norway
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I just have read it in 95 thread that Oppo has come out with the information that the main clock in 105 is 27 Mhz... Is also the only oscillator for the main processor. The 95 model used two clocks: one 25Mhz (stated as for transport part), and the main which it may be the 27Mhz one (on the back side of the PCB).
My 105 still be inside the box... I did not have yet the opportunity to power it and hear its original sound... It seems to me that will take a while until I will succeed to put some order in the mess caused by the moving of my living place...

Last edited by Coris; 28th November 2012 at 11:03 PM.
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Old 29th November 2012, 12:58 AM   #105
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Originally Posted by David Gatti View Post
It might be worth waiting for the Nuforce versions where hopefully these issues are addressed .... at a premium no doubt.
Hi David

I doubt if that will be good value.

Certainly more details are coming to light. Such as claims that parallelled up channels on the Sabre DAC is not necessarily worse for sonics - one that surprises me, but maybe right.

"Burson is using the ESS DAC chip in their latest DAC and they said they listened and paralleling actually sounded worse than single....so they are using it single. Also the Eastern Electric DAC (excellent sound, especially with Dexa or Burson Op amps) is using the DAC with just one set of outputs. I think Oppo said somewhere they felt there was no sonic penalty from doing it this way. So, there you have it. You can, of course, wire it any way you want." Ric Schultz

Burson? That is in your town, mate.

What I do know is this, and I am on public record on this, don't hesitate to pull the Sabre DAC to ground and dump both the converted offset current (converted from the now disappered 1.65V offset voltage), that will create 2.1mA per leg of the DAC (in the Oppo 95 2.1mA x 4 = 8.4mA). But may need 4x gain and I can cater for that. Maybe that will be OK, but it will be DC coupled, no caps of any sort in the signal path. The DC stability of the Sabre DAC is exceptionally good, so there is a way that the final DC offset can be nulled to 0mV.

As Tony from ID said to me about a week ago, it will be January and maybe even February before we see an actual physical unit down here, one we can examine closeup. My gut feeling is that it should work out OK and not be a downer relative to the '95. There is hopefully more plusses than negatives and the negatives won't affect the sound. With the right solutions of course.

Cheers, Joe R.

PS: I think it may be that Oppo is shorting an unused output of the Sabre DAC straight to ground? No problem - I have been doing it for years - and that 2.1mA current has to go somewhere I should think. Another thing we shall eventually get confirmed.
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Old 29th November 2012, 01:04 AM   #106
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Quote:
Originally Posted by Coris View Post
It may be the same as in 95 model (25Mhz). My 105 is on the way now, so in short time I will have a more precise answer....
It seems it may be 27MHz? That source is Jason via Ric. If so, maybe not a bad thing.

I do have a question for you: When you clocked the 25MHz on the Oppo 95 and heard the improvement, was this via file playback or via disk playback? Or did you hear no difference, or rather, the same improvement?

Cheers, Joe R.
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Last edited by Joe Rasmussen; 29th November 2012 at 01:07 AM.
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Old 29th November 2012, 01:16 AM   #107
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Quote:
Originally Posted by Coris View Post
Two (unofficial) pictures of inside 105: clock area for stereo DAC and final stage - output caps...
One can observe in the clock circuit, a little more care from Oppo designers to supply the oscillator with more clean power from a low noise regulator right near to it. But disappointing the frequency of this oscillator: 54Mhz...
The same as in 95 model
Yes, even on Oppo's top view I could see the X1, but not the frequency. But this looks much better than Oppo 95 and easy going the SAW way.

BTW, I am now using SAW 100MHz rather than 125MHz. On one player we picked up some static noises and going back to 100MHz we heard no loss in sound quaility. Also make sure there is a ferrite inductor and decent size ceramic stacked film cap on the Oscillator.

Like I said earlier, it is the quality of the SAW oscillator that is important, rather than the frequency (so will stick with 100MHz). And the same goes for Synchronous versus Asynchronous - not worth bothering about. Just go SAW!!!

Cheers, Joe R.
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Old 29th November 2012, 04:18 AM   #108
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Originally Posted by Joe Rasmussen View Post
Hi David

I doubt if that will be good value.

Certainly more details are coming to light. Such as claims that parallelled up channels on the Sabre DAC is not necessarily worse for sonics - one that surprises me, but maybe right.

"Burson is using the ESS DAC chip in their latest DAC and they said they listened and paralleling actually sounded worse than single....so they are using it single. Also the Eastern Electric DAC (excellent sound, especially with Dexa or Burson Op amps) is using the DAC with just one set of outputs. I think Oppo said somewhere they felt there was no sonic penalty from doing it this way. So, there you have it. You can, of course, wire it any way you want." Ric Schultz
Burson may not have a clue what is actually happening either.

When you parallel more channels, 2 things happen, 1) the OP Z gows lower,
and 2) the current goes up. IOW, in parallel mode, the I-V opamp is under
more current stress and is operating with more gain. Maybe their low OLG
high distortion opamp is just showing that it is less able to cope with the
increased demands in parallel DAC operation.

Just a (lateral) thought.
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Old 29th November 2012, 04:46 AM   #109
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Quote:
Originally Posted by zenelectro View Post
Burson may not have a clue what is actually happening either.

When you parallel more channels, 2 things happen, 1) the OP Z gows lower,
and 2) the current goes up. IOW, in parallel mode, the I-V opamp is under
more current stress and is operating with more gain. Maybe their low OLG
high distortion opamp is just showing that it is less able to cope with the
increased demands in parallel DAC operation.

Just a (lateral) thought.
Another lateral... solution: Me no use opamps....

It may well be that non-parallel sounds better with opamps, and even Burson uses opamps (feedback devices), even if non integrated variety. I don't use feedback and parallel may well be the best, still. In which case the '105 is a pain if one has tp remove ICs (would anyway) and then run jumpers. If only three pairs are used, then accessing the fourth could be troublesome - somebody suggested they were grounding when unused?

Cheers, Joe R.
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Old 29th November 2012, 07:59 AM   #110
Coris is offline Coris  Norway
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Originally Posted by Joe Rasmussen View Post
It seems it may be 27MHz? That source is Jason via Ric. If so, maybe not a bad thing.

I do have a question for you: When you clocked the 25MHz on the Oppo 95 and heard the improvement, was this via file playback or via disk playback? Or did you hear no difference, or rather, the same improvement?

Cheers, Joe R.
My above supposition about 25Mhz clock in 105 it were amended by myself in my last post, so it was not necessary your redundant contribution...
When about main clock in 95, I may be sceptic to this information (stated here as coming from Oppo...). The improvements after using an better oscillator her, or battery power for it, are general for both video and audio, and do not refer at the functionality of the transport only. Both video and audio are improved no matter where the files come (transport or another support). Not at last, when is to power this clock by battery, I remarked an quite clear improvement in the reaction speed of the processor (opening files and so on). This is just obviously (but not so easy to explain...).
The main processor in 95 include an HDMI stage (used as secondary HDMI output for the player), and I suspect this stage need an separate clock (27Mhz). The 25Mhz it my be the main clock anyway...
Maybe someone else will want to try to improve only the 27Mhz oscillator, and publish the result... In this way we can have a confirmation... But is a little bit of work to be put it in this...

Last edited by Coris; 29th November 2012 at 08:03 AM.
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