Have a look here....
http://www.avsforum.com/avs-vb/showthread.php?t=935808
Scroll down to #7 on "Why should I get a 705 over the 605?"
Quote:
General
- THX Select 2 Certification (605 has no THX)
- additional 10 watts per channel
- onboard fans for cooling
- Blue backlighting around the volume knob!!
- Advanced remote control - fully backlit with learning/programming abilities
Audio Processing
- 3 DSPs and more listening modes
- Audyssey MultiEQ vs 2EQ on the 605. MultiEQ is more advanced and supports 8 listening positions rather than 2
- 7 band equaliser vs 5 band
- expanded range of crossover frequencies (70Hz and 90Hz)
- ability to post process 5.1 channel PCM signals (ie from internally decoding BD/HDDVD players) to 6.1 or 7.1 (605 apparently cant do this on 5.1ch PCM)
- accepts DSD format (from SACDs) over multi channel inputs
Inputs/Outputs
- +1 HDMI input
- +1 digital coax audio input
- +1 optical audio output
- 7.1 channel RCA pre-outs
- Phono input
- 12V trigger out
- IR in (for infrared repeater systems)
- RS232 COM port
- zone 2 speaker connections have proper binding posts
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