Google will lead you to a full description of the Nuforce mods. The upgrade is mostly to the analog 2 channel output, so if that's a priority for you, it may be worth the difference in price.
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Sorry for the typo in the thread . . . meant 83se nuforce.
For anyone interested, following are the differences in the BD83se and BD83se nuforce. BD83se was available direct from Oppo, the nuforce version only available from dealers.
From hometheatrehifi.com . . .
To quote from OPPO's website:
"The OPPO BDP-83 Special Edition uses the state-of-the-art Sabre32 family of Digital-to-Analog Converters (DAC) from ESS Technology. The Sabre32 family is known as one of the industry's highest performance audio DACs and are often found in high-end audiophile and professional equipments. The OPPO BDP-83 Special Edition uses an 8-channel Sabre Premier (ES9006) DAC chip for its 7.1 multi-channel output. The dedicated stereo output uses another 8-channel Sabre32 Ultra (ES9016) DAC chip by stacking 4 DACs for each of the Left and Right channels to achieve even greater audio performance."
The price of the BDP-83SE is $899, sold direct on their website.
NuForce took the BDP-83SE a step further by replacing critical analog components with the high-grade equivalents NuForce uses in its high-end audio components. They also added high-speed power regulation on both DACs and all analog power rails, and bypassed the stereo and 7.1 channels output muting circuits, changing them to relays.
The BDP-83SE NuForce Edition is available through dealers, with an MSRP of $1,295.
I listened to a number of CDs, SACDs, and DVD-As, and the clarity of the sound (detail) was noticeably better than with the standard version. It wasn't a huge difference, because the standard version does pretty well with analog audio too, but it was definitely better.
I was told by someone who owns both the 83 SE Nuforce and the new Bdp 95 that the new Bdp 95 stock off the box is by FAR the way better than the modified 83 SE and yet you can still modified the Bdp 95. I suggest spend the extra money and get the Bdp 95. Most people that has the 95 didn't need to mod it as it's excellent already right off the box.