Onkyo receiver tx-nr646 vs tx-nr 747 is the difference worth the price?

The TX NR646 to me seems like the better value...a lot depends on how you will use it and what features the 747 might have that the 646 does not I would not worry so much about power ratings and the amp so much as basic features and what you do with it...like do you stream music do you connect a blue ray player etc.....both seem to be compatible with 4k TV but what else do you plan to do with it ??? deep color support might be something to look into may not be important now but may be in a couple years down the line....The problem is right now no one knows what's going to happen in a couple of years. Or what will be important... in December 2015 UHD blu ray players will be introduced and no one really knows what that means or how it will effect the industry...so my suggestion would be to wait till January 2016 so that you have a clearer picture as to what the impact will be of UHD blu ray.....The answers are not the same for everyone; people have different needs and different ways of approaching there entertainment solutions so its not something I could say without knowing more about your lifestyle....and what priorities you might have....

Yes, yes. by all means, buy the cheapest one with the weakest possible power supply, fewest industry level certifications, least power, over all, stunted versatility, and always go for amps that are not high current, or even capable of supporting 4 ohm loads. By the way most 8 om speakers loads vary anywhere from 2.8 to 12 ohms. The 8 ohm spec is just an average. might want to look at some manf views on this subject, just in general. Heres one: (of thousands)

http://www.magnepan.com/faq#equipment

just the sections starting "There are a few general design recommendations we can offer: " might help.

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