Originally Posted by Zigor
705 vs 805:
-50 Mhz vs 100 Mhz
-Burr-Brown 192/24-bit DAC on all Channels (TI Architecture (PCM1796))
Price difference $200. What advantage has 100 Mhz vs 50 Mhz? What is Burr-Brown?
The DACs convert the digital audio inside the receiver into analog signals for amplification and output to your speakers. The Burr-Brown PCM1796 parts provide higher quality conversion.
The 50MHz vs 100MHz refers to the bandwidth of the component switching. Analog connections like component are not lossless, so there will always be some amount of picture degradation when using component video switching. Higher bandwidth component connections reduce that picture degradation, particularly with 1080p signals. For example, if you are using 1080p component output from an Xbox360, you would want the model with 100MHz component switching.
805 vs 875:
-Faroudja DCDi vs HQV Reon-VX Video Processing and NSV Precision Video
-Dual Push-Pull Amp with 3 stage inverted
Price difference $600. What is the dual push-pull amp? How does it improve quality? Is the HQV Reon-VX far superior than Faroudja? Any comparison?
If properly implemented, then yes, HQV Reon-VX processing is far superior to Faroudja. Faroudja is the sort of processing you find in most $1000-$1500 LCDs and $100 DVD players. HQV is the sort of processing you find in $8000 to $15000 displays and $800-$2000 DVD players.
If you have a display with above average (or better) video processing, the Faroudja units will probably degrade your picture quality. In contrast, if properly implemented, HQV will significantly improve your picture quality. Presumably, Onkyo will provide the option to disable the video processing, as you would probably want to do if you bought one of the units with Faroudja.
In the off-chance that someone from Onkyo is reading this thread, please make sure that your TX-SR875 and TX-NR905 pass the tests on the new Silicon Optix HQV HD-DVD (Blu-ray version coming soon). This high-definition test disk is currently available to press and manufacturers by request. Simply testing with the older HQV DVD -- the SD version of the tests -- is not adequate to ensure a quality implementation.