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Old 29th November 2012, 07:17 AM   #111
Coris is offline Coris  Norway
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Quote:
Originally Posted by Joe Rasmussen View Post
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.
You may see in my those two pictures here that is about an 54Mhz clock in 105 too...
I may agree that the quality of the SAW oscillator have impact for the sound out of the DAC. My option still be overclocking the ESS9018.
After I used battery for this clock, I may correct your recommendation: go SAW and battery... I think to try one day an low power cmos oscillator for this clock. I suppose that the cleanness of the oscillator power it may be more important...
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Old 29th November 2012, 07:36 AM   #112
Coris is offline Coris  Norway
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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.
Grounding the ESS9018 (unused!!!) outputs it my be just stupid. Even more stupid not to use some of this chip outputs. The designer of this chip has created an architecture for take out the most of this device, and some another electronic designers just ground the DAC outputs? Sorry, but this is only nonsense...
Oppo has official stated that all the DAC channels are used (not grounded). They used two channels for headphone out...

Last edited by Coris; 29th November 2012 at 07:41 AM.
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Old 29th November 2012, 08:18 AM   #113
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Quote:
Originally Posted by Coris View Post
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. ..
Yep!

Try tell Ric Schultz that as Jason at Oppo said... oh well.

It is very curious indeed as what you say tally with what we got here.

Also, it was Audiocom who first pointed to the 25MHz in the Oppo 95, before yours truly. I also came across somebody else, just can't recall exactly who or where - so there your are...

Re '105 - if indeed just a 27MHz clock does the lot, then hopefully we will have no confusion or lead to any confusion. According to Ric, you have to remove the heatshrink on the Mediatek chip and it will turn out to be 27MHz. And that also came from Jason at Oppo, so make of that what you will.

Will you be soon looking at/removing that heatsink?

Cheers, Joe R.
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Last edited by Joe Rasmussen; 29th November 2012 at 08:42 AM.
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Old 29th November 2012, 02:49 PM   #114
Coris is offline Coris  Norway
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I did my self an research for a time ago about the main processor Oppo used in 95 model. If I remember well, I think I have seen something on an general description/advertise of the chip about the clock frequency, and it was 25Mhz. That because I were convinced that this is the main clock. This processor it were stand alone chip until Oppo printed its name on it...
An "Jason" from Oppo...?! It may be e everybody and nobody....
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Old 29th November 2012, 09:10 PM   #115
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Quote:
Originally Posted by Coris View Post
An "Jason" from Oppo...?! It may be e everybody and nobody....
It's possible that Jason got it wrong. Nothing is impossible. Not imputing bad motives to anyone.

But the word is now 27MHz for '105? You have the player, over to you to see through your eyes. Keep an eye on what commercial reclock makers will do respecting the '103 (since they will want you to do the Sabre DAC clock in the '105). But with the '103 they will need to look at clocking on the Digital Mainboard, which is the same for both players. Will it turn out to be 27MHz as predicted by Ric?

Cheers, Joe R.
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Old 30th November 2012, 06:51 AM   #116
Coris is offline Coris  Norway
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I'm not imputing anything nor to Jason or anybody. I was just pointed the ambiguity of this (clock) information.
As I've wrote earlier, I have not the right conditions right now, and huge another priorities, witch do not let me take a closer look inside my new 105. I will do it for sure very soon (I suppose...).
I just remember now an experiment I've done with this 25Mhz clock. I've used an 50Mhz one in that place. Nothing worked, except reading/playing files from USB interface. Of course I've got access to user interface. It were so exceptional video and audio out of the player, but were not possible to get access to transport and SATA. This experiment It seems to confirm that 25Mhz clock may have a connection with transport stage... What it may be your conclusion?
It may be very interesting to try double the clock frequency for the only one (27Mhz) processor clock in 105... It looks to me that the eventual clock for transport is derived (drive a PLL) from that main 27Mhz... I will for sure try this.

Last edited by Coris; 30th November 2012 at 07:03 AM.
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Old 30th November 2012, 07:20 AM   #117
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All this obsession about coupling caps...he he. The Elna Silmic II caps used on the output of each channel in the 105 are actually excellent sounding coupling caps....better than many film caps. These parts are not the weak link in the output stage. This I know from experience. I have modified the output stage on the 105 and the sound is way better and I still have the Elna Caps in there. The modding game is infinite. If you just obsess in one area ("we must remove the coupling caps, we must remove the coupling caps, we must remove the coupling caps", on and on and on and on.....he he).....then we make very little progress. There are way more important things to remove/change/modify than the coupling cap.....for instance, removing the 50K resistor to ground after the coupling cap makes a serious improvement.....showing us that the resistors they use are not so hot. The tweaking game is infinite......please do not spend all your time on one place....there is a lot to do and a lot to learn. I do tons of stuff all over the player that make a serious sonic difference. You can learn much by reading my website about some of the things I do. Try these things....they all work.
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Old 30th November 2012, 08:00 AM   #118
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well you better leave your amps connected the whole time, because without that 50k to ground to bleed the DC from the coupling caps if you connect an amp while its on you'll get a nasty transient. thats what they are there for
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Old 30th November 2012, 08:16 AM   #119
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A fifty K resistor would only slightly damp a DC transient.....the fact of the matter is that the Oppo has relay muting on all the front channels that shorts the output to ground before any transient can occur.....this is why you do not need a resistor there. Some people complain about the relays going on and off all the time. They work. No transients will ever come out of the Oppo. No need for the resistor.

By the way, there is only 10mv offset max before the coupling cap. As has been described, the 95 had no coupling caps.....none. It also had relays....no one ever has had a problem.....even DC coupled.
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Old 30th November 2012, 10:05 AM   #120
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Small amounts of DC <10mV is not much of a problem.

Obsessing about caps? A lot of money in that game. I do think caps are important, just let us not elevate them to sainthood.

Cheers, Joe R.
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