Diyaudio ( http://www.diyaudio.com/forums/digital-source/222596-oppo-s-bdp105-discussions-upgrading-mods.html ) 포럼에 올라 온 글을 열심히 읽고 있는데 얼마 전 노르웨이의 크리스 란 친구가 올린 OPPO 105의 2 채널 DAC 부분에 있어 전원부가 약간의 잘못 설계 또는 부실 설계 되어 있다는 말이 있었다.

요점은 Sabre ESS9018 칩은 매우 좋은 DAC 칩이지만 그 성능을 제대로 끌어 내려면 섬세하고 전원 회로가 뒷받침 되어야 한다고 하고 OPPO 105/105D의 경우 몇 가지 점에서 개선 되어야 한다고 전제 하며 제안 한 것이

1. Sabre ESS9018의 디지털 전원으로 들어가는 두개의 1.2V와 3.3 V 레귤레이터가 단순한 정류후에 바로 7.5 V DC 입력되는데 이래서는 리플 전류가 너무 많고 입력 전압이 너무 크다

해결책: 중간의 25V 3300uF의 콘덴서를 들어내고 그 자리에 정전압 5V 레귤레이터 회로를 4700uF /16V 전해 콘덴서와 함께 새로 만들어 집어 넣는다.

2. 3.3 V 레귤레이터 Vref와 접지 사이에 들어가야할 안정화 콘덴서가 들어 가 있지 않아 리플 전류가 많다.

해결책: 33uf/16V 탄탈 콘덴서 추가 삽입

3. 두개의 1.2V와 3.3 V 레귤레이터 전후의 콘덴서 품질을 좋은 것을 써야 하는데 범용 전해 콘덴서 사용

해결책. 출력 콘덴서로는 산요의 OS con을 , 입력 콘덴서로는 NIchicon 사의 audio grade 중 최고급인 KW 시리즈 콘덴서 사용.

  결과 : 엄청남 사운드 개선이 이루어졌습니다. 그 변화의 폭이 너무 커서 믿기지 않을 정도이고 이게 정말 사브레 ESS9018 칩의 실력인가 생각됩니다.

- 저음 부분의 명확한 해상력

- 넓고 깊어진 음장 및 각 악기 질감의 표현력

- 오래 들어도 계속 편하게 느껴지는 음질  ( 개조 후 4 시간 여러 음악을 들었는데도 질리지 않고 또 과거에 많이 들었던 곡이 모두  다 새로운 레코딩을 듣는 느낌 ) .

- 살랑 거리는  중 고역

 전체적으로 엄청난 변화를 느꼈습니다 . 이제 거의 궁극의 소스기기로 변한 듯 싶습니다.

재미 있는 것은 비디오 부분은 건드리지도 않았는데 이 쪽 부분도 대폭적인 화질 향상이 느껴집니다. 엣지가 분명해지고 콘트라스트 폭도 커지고 색상 재현력도 품위있게 변했습니다.

이해가 안가지만 잘 즐기고 있습니다.

밑에는 어제 급히 한 분의 간단한 코맨트를 카톡으로 알려 온 것 입니다.

최근에 하신 다른 분의 코멘트

OS con의 특징 :

Very low ESR

ESR is stable over a wide temperature range

Wide temperature range -55 degrees C to 105 degrees C

Wide frequency range

High ripple current capability

Long life

Like many Audiophile users of OPPO 105/105D, main concerns are how we can extract most from 2 cannel analog audio output of OPPO 105/105D.

  In other to do this, there have been many discussion and experiments .

  So far, there are 3 main points to reach this goal

1. Linear power supply.

  The LPM offers significantly enhanced audio and video performance over the standard switch mode power supplies. You will notice the improvement instantly, and with 100 hours burn-in its true ability will come out.

 The 'Special Edition' version has the best possible parts for even better performance.

  Standard capacitors have been upgraded to low ESR Nichicon electrolytic audio grade capacitors.

  Multiple all discrete Schottky barrier diodes are now used throughout. The lower voltage drop of the diodes provides higher switching speed and better system efficiency, while producing less heat, EMI and switching noise.

  Wima polypropylene and tantalum capacitors are included for regulator IC buffering and impendence matching.

  An easy to install module that requires no soldering or technical ability. Can be done in 5 minutes( or 15 min. in case of OPPO 105/10D)  with just a screw driver.

2. Clock mod.

  The digital system depends heavily on clocking.

  The existing clock is normal, 300 PPM class clock.

  As the clock becomes more accurate, we can feel the sound stage is more defined and the depth of sound becomes more deep while we can distinguish each musical instruments much easier.

In video respect, the edge of each object is more clear. the color becomes more vivid and splendid.

  The TCXO is a temperature controlled crystal oscillator module running at 2.5 ppm. It enhances audio and video performance to a large degree.

The TCXO Module draws it's power from the LPM Module and then creates its own 3.3v regulated voltage. Installation requires fine soldering skill and technical ability.

You will also require an LPM to power this clock module.

  The OCXO is an oven controlled crystal oscillator module running at 0.01 ppm. It enhances audio and video performance to a very large degree.

  The OCXO Module draws it's power from the LPM Module and then creates its own 3.3v regulated voltage. Installation requires fine soldering skill and technical ability.

  Only the main system clock is OCXO in this module, the secondary clocks are TCXO. The main system clock is the most important for doing clock upgrades.

  You will also require an LPM to power this clock module.

  For those who do not like soldering we offer an installation service. You remove the main board from your Oppo player and post it to us, we do the clock upgrade and post it back.

 We have created an easy step by step guide to removing the main board in the Oppo player. go to www.opppmod.com  install section

3. Analog DAC mod.

  This upgrade is a done to the Sabre analog DAC output board of the Oppo 105/105D.

 It enhances audio quality to a very high degree. ( not Video )

STEP 1

 Upgrade the Sabre DAC clock to a 100 MHz TCXO. This adds 384KHz file play functionality while improving sound with greater detail and more accuracy.

STEP 2

  Replace the existing 8 fast recovery diodes with the revolutionary Schottky barrier diodes. This Schottky diode module has very little voltage drop which provides higher switching speed and better system efficiency.

STEP 3

 Bypass electrolytic capacitors at both balanced and unbalanced 2 channel audio outputs. Direct coupled outputs gives clearer sound. In case of direct connection to Power amp, we install 1uF/63V Wima film capacitors as coupling capacitor.

STEP 4.

install pre 5V regulator between rectifiers and 3.3V and 1.2V regulators

and fix minor error in 3.3 V regulator section which need 33uF tantal capacitors between output and ground .

replace normal capacitors with OSCON and Nichicon KW capacitors .

To do this modification, you will need to remove the analog audio board and post it to us.

This effects mostly to 2 Channel audio, but it enhance 7.1 analog audio performnce too since clock and analog power sections are common.

Complete MOD - $930

Complete modification service for OPPO 105/105D.

This service include LPM SE installation, OCXO/TCXO clock mod and 2 channel DAC board mod (100 MHZ TCXO clock modification, Wima film capacitor output coupling and 8 Schottky Barrier diodes).

With this complete mod, your OPPO 105/105D will become true high-end all around music server/player.

Send your whole OPPO 105/105D (or mother board and 2 channel DAC board only ) to me, I will send you back within 2 working days. (In Europe/North America, total time would be 7-11 days)

Your Country’s POST office EMS ,UPS or DHL is the best option to send.

I will send you back by Korea Post EMS or UPS with double box.