First of all let me say that this unit is a very good piece of equipment. I was under the assumption that it lacked rca to s-video upconversion. Wrong, it has that feature, and it works great. I did alot of comparing between the STR-DA2ES,4ES, and I came to the conclusion that $200 dollars was to much to pay for a couple of features namely 7.1, rs-232 port, and gold plated jacks. I know the 4ES has a supposed bigger powersupply(Transformer). After extensive testing of the 2ES, I find the power to be more than capable. It has all the same features, dsp's, and bass management that the 4es has. This unit has a good sound for both music and hometheater. I love the neo:6 cinema. It works alot better than pl2 for movies. The surround sound using dolby, and dts was marvalous. I can hear sounds that were not present before with my sony str-k840p that came with my htib. The effects seem more fluent, and travel the room like they should. My favorite feature of this unit has got to be the audio split it comes in very handy. If anyone has compared the 2es, and 4es sonically I would love to here what the differences are that you noted. I have not tested both units therefore take my review with a grain of salt. I do like my new receiver for all the features, and the power it has. I have been a loyal Sony fan for a few years now. Let me be quite honest I have never had any problems with any Sony receiver so far. I tested all the other models before settling on the 2ES. I tested from the likes of Harmon, Onkyo, Panasonic, and the basic other manufactures in my price range. So in closing this unit is a good mid-level receiver in my opinion, and the fact it is loaded with so many otherwise costly features make it an attractive piece of equipment. All comments welcome in response to this review.