Product Features:
- 100 Watts/Channel at 8 ohms (FTC)
- Dolby TrueHD, DTS-HD Master Audio, Dolby Digital Plus, DTS-HD High Resolution Audio, Dolby Pro Logic IIx, DTS Neo:6, THX Select 2 and THX Surround EX Decoder.
- HDMI video up-conversion with DCDi technology
- HDMI V1.3 repeater (3 in/1 out, 1080p compatible)
- RS232 Port for Audyssey MultEQ XT Interface Control
Onkyo is an organization consisting of people unsurpassed in the love of sound. Onkyo won’t settle for second best. It strives to complete what ithas started. That’s the Onkyo spirit. For the past half-century Onkyo components have been recognized as uncommonly musical among those who are truly fanatical about their music.
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Customer feedback:
1. The reason to get this receiver over the 605 is the step up to 3 hdmi inputs and THX certification. The power consumption of this unit is more efficient then the 805 and 605. This unit was built after those 2 other models. This isn’t the lonely middle child, it shines on its own.
There is also a slew of issues this receiver does not exhibit that the 805 has problems with (check AVS forums for details). HDMI video looks great, 7.1 sound great! Price is great! 
2. In short, this is a very capable receiver, but getting it set up is just awful. Once you –finally– reach the audio “audessy” setup with the microphone, it is painless. Audessy works quite well. They have solved the typical setup problems, but allowed a host of others to crop up.
Fan noise is excessive, the fan seems to have 2 speeds: on and off. It also seems to make a ringing sound as its frequency often reinforces the sound of the (normally quiet) fan in my 60″ Sony LCD projector above it. This is the best bang for the buck, sounds fabulous, but — really — needs a better manual.