Upgrading & modding new Oppos, BDP-93 & BDP-95 - Page 32 - diyAudio
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Old 17th December 2012, 09:16 AM   #311
SGK is offline SGK
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Hi. First post here but I have been lurking for some time trying to learn. I have an Oppo 93 which I am about to replace the power supply with one of Jae Hong Lee's LPSU (or I may purchase the 103 and do the same). I have already disconnected the power to the analogue board as I have no interest in using the Oppo DACs (instead I prefer the DACs in my Theta Casablanca IIIHD) and may now remove it entirely. Venturing into the clocks would require outside assistance (e.g. Jae Hong's OCXO board) as I have next to no electronics expertise but I am learning.

I read here that one good upgrade to the Oppo is to disconnect the Toslink connection. Is this readily done or is it complex?

BTW Theta have released their new player based on the Oppo 95. Essentially it is the Oppo 95 optical drive and main digital board in a heavy chassis with a linear power supply - no analogue components. I very much like the direction of this (or, even better, units such as the Bryston BDP-1 or 2) but it doesn't look like they've upgraded the clocks or anything else.
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Old 25th January 2013, 04:48 PM   #312
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Hi All
Is there any risk in removing the earth connection on the 93?
And also does anyone know what the oscillator (X7)next to the Marvel chip does?Marked 0246T E.1906.
Thanks for any help

Smiffy
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Old 28th January 2013, 06:03 PM   #313
Coris is offline Coris  Norway
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Quote:
Originally Posted by Smiffy View Post
Hi All
Is there any risk in removing the earth connection on the 93?
And also does anyone know what the oscillator (X7)next to the Marvel chip does?Marked 0246T E.1906.
Thanks for any help

Smiffy
The player grounding must not be removed. The grounding through the power cord it protect the user and the whole chain which is to be connected to the player.
Even more, this grounding assure a noise filtering which result in the switching PSU functioning in the player. Dangerous (for the player electronics) spikes can occur which it may propagate through system, if the grounding is removed or not connected to the ground (through the wall power contact). Static electric discharges may occur too, when the user touch the device, and this may damage the sensitive components inside the player
I know there are some "advices" on some forums from people who have not any clue about electronics and physics, that removing the player grounding it will improve the sound. THIS IS JUST STUPID!
The improving in player sound it come from completely different places/mods in the player system. The power cord grounding and the connection to the player have to be intact and functional. One should care to connect the player in to an grounded contact in the wall.

X7 is the clock oscillator for the QDEO processor.

Last edited by Coris; 28th January 2013 at 06:06 PM.
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Old 28th January 2013, 06:12 PM   #314
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Many thanks for the info Coris.You are very helpful.much appreciated

Smiffy
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Old 4th February 2013, 05:05 PM   #315
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Quote:
Originally Posted by Coris View Post
The player grounding must not be removed. The grounding through the power cord it protect the user and the whole chain which is to be connected to the player.
Even more, this grounding assure a noise filtering which result in the switching PSU functioning in the player. Dangerous (for the player electronics) spikes can occur which it may propagate through system, if the grounding is removed or not connected to the ground (through the wall power contact). Static electric discharges may occur too, when the user touch the device, and this may damage the sensitive components inside the player
I know there are some "advices" on some forums from people who have not any clue about electronics and physics, that removing the player grounding it will improve the sound. THIS IS JUST STUPID!
The improving in player sound it come from completely different places/mods in the player system. The power cord grounding and the connection to the player have to be intact and functional. One should care to connect the player in to an grounded contact in the wall.

X7 is the clock oscillator for the QDEO processor.
Ps do you know what frequency the X7 is Coris?Ta
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Old 4th February 2013, 08:27 PM   #316
Coris is offline Coris  Norway
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Old 4th February 2013, 09:34 PM   #317
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Almost all inexpensive gear comes with ungrounded power cords (two prong power cords)....even the Oppo 83 and 83SE had no internal ground connection (third pin not hooked up). Please show evidence that any Oppo or any other player "broke" because of this. However, grounding the equipment is a nice "protection". I use no grounded cords. I do ground the system at one point and since all the chassis and signal grounds are tied together I do have a single "true ground". There is lots of evidence (subjective, natch) that in certain systems having no "true ground at all" gives the better sound. Everyone has their own "belief system". I try to keep mine to observed (listened to) facts.
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Old 4th February 2013, 09:48 PM   #318
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Have to admit I don't like gear with PE/Safety Earth connected and (while not being hindered by any knowledge of the Oppo devices) I can tell that 99% of switched PSU's need PE for getting rid of RF/EMI.
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Old 4th February 2013, 09:48 PM   #319
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Quote:
Originally Posted by Ric Schultz View Post
Almost all inexpensive gear comes with ungrounded power cords (two prong power cords)....even the Oppo 83 and 83SE had no internal ground connection (third pin not hooked up)...
In some countries this is a hoary problem legally. But I agree generally with you.

Probably the best place, technically, is to ground where the input to the power amp is. But not necessarily a practical solution. Or ground the power amplifier IEC - and then let the rest of system get it from there. But often it is the preamp that gets grounded - as it is the central point of most systems.
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Old 4th February 2013, 10:26 PM   #320
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When I make a power amp or integrated, I ground the IEC directly to chassis. Then where the input stage is I ground it via a low value resistor - and this gives good protection against hum. And 100% safety wise - no legal problems either.

Cheers, Joe
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