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Oppo Sonica DAC
Oppo Sonica DAC
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Old 17th October 2018, 08:41 AM   #81
wealas is offline wealas
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Until recently there was no output stage that could handle the total current coming from 4 channels of the 9038PRO so they probably didn't want to design a new one
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Old 18th October 2018, 08:08 AM   #82
Coris is offline Coris  Norway
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Oppo Sonica DAC
Yes indeed, this it seems to be the right explanation of the Oppo design and the use of the new Sabre DAC chip in Sonica. All those who was thinking Sonica it benefit of all 9038Pro output channels, took it wrong (myself too). The hope is now that we may have active the two grounded channels. I will check soon this aspect...
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Old 18th October 2018, 08:58 AM   #83
wealas is offline wealas
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Channel mapping for the 9038PRO is done via I2C, so unless they had some weird reason to map inputs to grounded outputs I doubt those are active.
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Old 21st October 2018, 08:42 PM   #84
beeppeep61 is offline beeppeep61  Italy
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Completed the Upgrading jobs !! (For the moment) Replaced the Rectifier Bridges with Schottky Diodes. Replaced in the 12V dual power stage the 6800uF capacitors with 22000uF and 1000uF capacitors with 4700uF, 100nF bypasses were all provided. Replaced +/- 12V regulators with very low noise modules. Removed original 100MHz Oscillator and replaced with module CRYSTEK CCHD-950, thanks to an air desoldering station (purchased on Amazon at 117 ) in 30 seconds with a temperature of 280 C, it was very easy to remove the metal screen, it is recommended to have it not to make disasters !! Previously performed, change to decoupling capacitors by replacing the original 100uF with PANASONIC OS-CON with parallel WIMA from 1uF type MKP1 Remove the 3.6 uH inductors in series to the output signal after the relays and bridged with tin drop. Placed with mini heat sink pad on the ESS9038 chip.
Attached Images
File Type: jpg Cond. 4700uF new.jpg (235.3 KB, 245 views)
File Type: jpg Cond. 22000uF.jpg (175.5 KB, 251 views)
File Type: jpg Cond.bypass sotto scheda.jpg (226.4 KB, 249 views)
File Type: jpg Dissipatore ESS9038_01.jpg (215.3 KB, 248 views)
File Type: jpg Gigi con Occhiali Speciali.jpg (138.5 KB, 247 views)
File Type: jpg Induttanze 3.6uH.jpg (213.3 KB, 71 views)
File Type: jpg Induttanze ponticellate_02.jpg (234.0 KB, 59 views)
File Type: jpg Modifica Oscillatore 100MHz_01.jpg (212.5 KB, 65 views)
File Type: jpg Nuovi Ponti Diodi_01.jpg (222.1 KB, 73 views)
File Type: jpg Oscillatore senza schermo.jpg (256.9 KB, 73 views)
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Old 28th October 2018, 03:03 PM   #85
Coris is offline Coris  Norway
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Oppo Sonica DAC
The reviewed PCB of my LPS is now assembled and working.
A little cosmetic fault this time, the green colour, instead of white...
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File Type: jpg SonicaLPSv2-A.jpg (316.0 KB, 74 views)
File Type: jpg SonicaLPSv2-C.jpg (539.2 KB, 73 views)
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Old 2nd November 2018, 08:33 PM   #86
Coris is offline Coris  Norway
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Well, the original power management of Sonica it gave me some serious headaches. The device would not want to accept my LPS. Finally I figured it out.
Now they are working well together. The sound so with only the LPS in place is just exceptional. It will follow now the clock board, and my fully differential output module. The work is ongoing...
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File Type: jpg Sonica LPS at work.jpg (289.4 KB, 54 views)
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Old 3rd November 2018, 11:49 AM   #87
Coris is offline Coris  Norway
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Oppo Sonica DAC
As expected, the grounded DAC output channels are not active.
So, for Sonica as well, the SabrePro chip is configured to output only on two channels pairs (XLR/RCA). The only possible improvement in this case is unifying these two channel pairs.
Sad enough Oppo have chosen to use this so performant DAC chip on half of its output capabilities...
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Old 4th November 2018, 02:17 PM   #88
beeppeep61 is offline beeppeep61  Italy
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Hi Cris, what would be the audible advantage in having more outputs in parallel of 9038?
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Old 4th November 2018, 03:01 PM   #89
Coris is offline Coris  Norway
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More dynamics, much better sound scene, improved signal/noise level... Overall audible improvement is obvious.
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Old 4th November 2018, 03:56 PM   #90
beeppeep61 is offline beeppeep61  Italy
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I am really amazed that OPPO has made the decision not to use these outputs of the DAC !!
SONICA could have reached very high audio levels.
I assume they can not be activated in hardware mode.
But deciding to use only the balanced output, how can you add the DAC channels related to the unbalanced outputs ??
Are you thinking about this operation in your upgradings ??
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