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Oppo Sonica DAC
Oppo Sonica DAC
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Old 22nd January 2017, 11:44 PM   #11
Bigun is offline Bigun  Canada
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Oppo Sonica DAC
This looks promising then.
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Old 23rd January 2017, 07:23 AM   #12
Coris is offline Coris  Norway
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Oppo Sonica DAC
Referring to the marking confusion, I pointed out on my previous posts, it looks like there is a reasonable explanation.
There were different production batches (pre production, and full production). As there is known the pre production chips it came out with some issues, it is advisable avoiding the use of that specific marked chips, which it could be on marked out there.
The right marked chips it looks like the one inside Sonica DAC...
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Old 23rd January 2017, 11:22 PM   #13
Bigun is offline Bigun  Canada
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Oppo Sonica DAC
"Price:$799 (Coming Early 2017)"
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Old 12th February 2017, 07:54 PM   #14
Coris is offline Coris  Norway
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Still not coming yet in Europe....

"America first"! Of course...
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Old 13th February 2017, 08:00 PM   #15
markk02474 is offline markk02474  United States
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Quote:
Originally Posted by Coris View Post
Still not coming yet in Europe....

"America first"! Of course...
By waiting, you get a more mature product with the software issues better worked out and modifiers time to fix the weaknesses, which include obsolete voltage regulation and electrolytic capacitors in the signal path. Additionally, the ES9038pro dac chip isn't used optimally. Its 8 outputs could be used as 4 in parallel on each stereo output. Instead, Oppo split outputs among left balanced, left unbalanced, right unbalanced, right balanced.
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Old 13th February 2017, 10:09 PM   #16
Coris is offline Coris  Norway
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Yes, indeed Oppo stil use the same wrong DAC outputs configuration design, as in previous 105/105D players models. This is only sad, as no any progress it was done here...
This wrong DAC output configuration it was largely criticised before, and it looks like nothing it was heard...
The only Oppo device which it had a right such configuration it was HA-1.
ESS advertised their new DAC chip (9038Pro) for a huge dynamic capability of -140dB. Sonica DAC is specified for >120dB...
Using a SMPS in a such high end declared device is a nonsense, and it is another downgrade from the HA-1, which it was entirely linear powered...

Well, I have finalised already my list of modifications/improvements for this device. I`m waiting only for the opportunity to buy it... I will buy it for the new Sabre DAC chip inside, as for the upgradable firmware. Else, quite much to change inside...
However, I assume it will sounds well together with HA-1, and its excellent class A stage...
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Old 14th February 2017, 01:24 AM   #17
markk02474 is offline markk02474  United States
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Default Sonica all op amp outputs, albeit good ones

Sonica uses LM4562 op amps for I/V conversion and the single-ended outs. The balanced outs use LME49724 op amps. Probably not possible to get 140db without going with low impedance discrete bipolar amplifiers.

Did I mention that the +12v, -12v, and +5v voltage regulation are all by fixed three-terminal regulators? An homage to 1995 and the design of the Marantz CD-53/63?
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Old 14th February 2017, 01:43 AM   #18
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by Coris View Post
Using a SMPS in a such high end declared device is a nonsense, and it is another downgrade from the HA-1, which it was entirely linear powered...
Not necessarily, it depends if their engineers understand the noise mechanisms and mitigate them. Switching supplies do have upsides in terms of much lower flux radiation at mains frequencies.
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Old 14th February 2017, 10:23 AM   #19
Coris is offline Coris  Norway
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The beneficial of a linear power for a digital system, over a switching PSU one, for the resulting audio/video signals out of a processing device (as a DAC, or multimedia player device) is more than obvious, and huge. Just do it yourself this experiment, powering a digital processor device from a linear PSU, and compare the results.
Is just very unfortunate that some (decision) engineers does not understood or realise yet this simple fact.
Well, maybe some or many decision factors out there may realise/understand the beneficial of a linear PSU in a system, but there are the economical reasons which stop/prevent a such design to be (mass) produced. At least here there is quite a paradox: it are much more costly the efforts as design and as production, to minimise the large spectre noises coming from a SMPS, to propagate into the system, even more efforts to filter out such noises both hardware and software, than just using a simple regulator device and some good enough filtering capacities to realise a complete silent PSU.
My developed linear PSU (LPM) which I use for these Oppo devices, it have a residual ripple (50hz and its harmonics) of under 1ÁV when loaded with 4A, and even lower under lower loads. Only this LF residual noise, and that`s all. Not any of HF noises.
The measured large spectre noises for the SMPS types used in Oppo devices, it goes over 100mV (measured in similar conditions)! Such noises (at their levels) are not to be filtered out, no matter how much the Oppo engineers may understand or want to mitigate them... Such noises are spread into the whole system with negative influence for the whole processing, as for the resulting signals. This is so obvious as night and day. Comparing the same system powered by linear power versus switching type power, it fully confirm the huge differences...

Sonica DAC it need 40w max power. For sure its digital stage it use 20-30w of this total specified power. For these 20-30w Oppo engineers have decided to use a SMPS... Not shielded at all, and quite close to the analogue/DAC stage... It is a such decision the right one? I doubt seriously...
It was enough only one more winding on the already used toroid, a regulator device and some filtering caps to realise a much better power provider for the digital stage, and finally, better parameters for the resulting analog signals...

Last edited by Coris; 14th February 2017 at 10:29 AM.
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Old 14th February 2017, 10:31 AM   #20
abraxalito is offline abraxalito  United Kingdom
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You've missed my point Coris - I'm not talking about the typical implementations of switching supplies by engineers who don't fully understand the noise implications (the vast majority). I agree mostly the implementations suck. There's no overall benefit of a linear PSU, its dependent on the implementation.

Take an example - if noise were a problem that couldn't be solved then Audio Precision wouldn't have adopted a switching supply in their newer generation of kit. If residual ripple is a desired aim a linear reg can be put after a switching supply.

If you're claiming 100mV of high frequency noise can't be filtered out, I shall take on your challenge and show your claim is erroneous.
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